A method and system for analyzing the local shear contribution of rough structural surfaces

Abstract

This invention provides a method and system for analyzing the local shear contribution of a rough structural surface, belonging to the field of structural mechanics. The method includes: acquiring structural surface response data reflecting the evolution of the shear response during shear loading of the rough structural surface; identifying multiple local shear contributing entities formed during the shear process, where each local shear contributing entity is a local region of the structural surface that plays a dominant role in the overall shear resistance; tracking the change in the load-bearing state of each identified local shear contributing entity with the evolution of shear displacement during shear loading, and obtaining the corresponding shear response characteristics; and determining and outputting the contribution relationship of each local shear contributing entity to the overall shear resistance of the rough structural surface based on the shear response characteristics and corresponding spatial distribution relationships of each local shear contributing entity. This invention provides a clear identification and analysis of key local load-bearing regions and their evolution relationships in the overall shear resistance of a rough structural surface.

Description

Technical Field

[0001] This invention relates to the field of engineering structural mechanics, specifically to a method and system for analyzing the local shear contribution of rough structural surfaces. Background Technology

[0002] In geotechnical engineering, underground engineering, and the service life of engineering structures, rough structural surfaces are widely present in rock joints, concrete-rock interfaces, and various structural contact interfaces. The mechanical behavior of these surfaces under shear conditions directly affects the overall stability and safety of the engineering structure. Therefore, the study of the shear resistance characteristics of rough structural surfaces has always been an important aspect of structural surface mechanics and engineering safety analysis.

[0003] Existing research on the analysis of structural surface shear behavior is typically based on the results of global-scale shear tests. Shear strength-displacement curves, peak strength, residual strength, and other global response indices are used to evaluate the shear performance of structural surfaces under different normal stress levels, roughness conditions, or loading methods. While these analytical methods can reflect the variation in the overall shear capacity of the structural surface, their analysis primarily focuses on the overall mechanical response level, making it difficult to reveal the actual load-bearing capacity and evolution characteristics of different local regions within the structural surface during the shear process.

[0004] In actual shearing processes, rough structural surfaces are not uniformly stressed; their shear load-bearing capacity is often initially driven and dominated by certain local regions. As shear displacement increases, the load-bearing state of these local contact areas evolves, manifesting as contact establishment, compaction enhancement, load transfer, or contact weakening. This emergence and transfer of local load-bearing behavior is a crucial physical mechanism influencing changes in the overall shear response. However, current technologies largely rely on empirical analysis of failure morphology or curve characteristics after experiments, making it difficult to continuously identify and track local load-bearing regions during shearing, and also failing to clarify the roles of different local regions in the overall shear behavior at different shear stages.

[0005] On the other hand, some studies attempt to simulate the shear process of structural surfaces through numerical analysis or computational models to analyze stress distribution or changes in contact state. However, such methods often rely on idealized assumptions or complex calculation processes, and their analysis results are usually given in the form of numerical fields or parameter distributions, which are difficult to directly correspond to the specific load-bearing areas on actual structural surfaces, and are also difficult to use for the identification and interpretation of local shear resistance in experimental processes or engineering sites.

[0006] Therefore, existing technologies still lack an analytical method capable of identifying and tracking local regions participating in shear load resistance on rough structural surfaces based on actual structural response information during shear loading, and further clarifying the role of different local regions in the evolution of shear displacement on the overall shear behavior. How to materialize and characterize the local load-bearing behavior of structural surfaces during shear loading without relying on purely computational rules, and reveal their contribution to the overall shear response, remains a pressing technical problem in the field of structural shear mechanics analysis. Summary of the Invention

[0007] The purpose of this invention is to provide a method and system for analyzing the local shear contribution of rough structural surfaces, so as to at least solve the problem in the prior art that it is difficult to identify and determine the interaction relationship of local regions of structural surfaces that participate in shear load during shear loading.

[0008] To achieve the above objectives, a first aspect of the present invention provides a method for analyzing the local shear contribution of a rough structural surface. The method includes: acquiring structural surface response data reflecting the evolution of the shear response during shear loading of the rough structural surface; identifying multiple local shear contributing entities formed during the shearing process based on the structural surface response data, wherein each local shear contributing entity is a local region of the structural surface that exerts a dominant load-bearing effect on the overall shear behavior; tracking the change in the load-bearing state of each identified local shear contributing entity as shear displacement evolves during shear loading, and acquiring corresponding shear response characteristics; and determining and outputting the contribution relationship of each local shear contributing entity to the overall shear behavior of the rough structural surface based on the shear response characteristics of each local shear contributing entity and its corresponding spatial distribution relationship.

[0009] Optionally, during the shear loading process of the rough structural surface, structural surface response data reflecting the evolution of the shear response of the structural surface is acquired, including: continuously acquiring information on the change of the normal contact state of the structural surface along the shear displacement direction during the shear loading process to characterize the contact, compaction, or separation process of local areas of the structural surface under shear action; simultaneously acquiring information on the change of shear force corresponding to the shear displacement to reflect the evolution characteristics of the overall shear resistance response of the structural surface with the shear process; and associating the information on the change of the normal contact state with the information on the change of shear force according to the corresponding shear displacement to form structural surface response data used to characterize the evolution process of the shear response of the structural surface.

[0010] Optionally, based on the structural surface response data, multiple local shear-contributing entities formed during the shearing process are identified, including: based on the normal contact state change characteristics reflected in the structural surface response data, determining local regions on the structural surface that continuously form contact compaction or locking effects during the shearing process as candidate local shear-contributing entities; judging the load-bearing continuity of each candidate local shear-contributing entity during the shear loading process, and selecting local regions that maintain the main load-bearing effect within a preset shear displacement range as the local shear-contributing entities.

[0011] Optionally, the load-bearing continuity of each candidate local shear contributing entity during shear loading is determined, and local regions that maintain the main load-bearing function within a preset shear displacement range are selected as the local shear contributing entities. This includes: during shear loading, acquiring the normal contact state change trajectory and shear response change trajectory corresponding to each candidate local shear contributing entity; based on the normal contact state change trajectory, determining whether each candidate local shear contributing entity undergoes a continuous evolution process from contact establishment, compaction enhancement to stable load-bearing during shear displacement evolution; based on the shear response change trajectory, determining whether each candidate local shear contributing entity continuously bears the main shear resistance within the preset shear displacement range; and determining the candidate local regions that simultaneously meet the contact stability determination condition and the load-bearing continuity determination condition as the local shear contributing entities.

[0012] Optionally, during shear loading, the load-bearing state changes of each identified local shear-contributing entity as shear displacement evolves are tracked to obtain corresponding shear response characteristics. This includes: during shear loading, synchronously tracking the normal contact state and shear load-bearing state of each local shear-contributing entity according to the evolution order of shear displacement; based on the changes in the normal contact state, identifying the load-bearing state stage of each local shear-contributing entity at each shear displacement stage according to different stages corresponding to the shear displacement, wherein the load-bearing state stage includes any one or more of the contact establishment stage, compaction enhancement stage, stable load-bearing stage, and contact weakening stage; based on the changes in the shear load-bearing state, obtaining the shear response characteristics of each local shear-contributing entity at each corresponding load-bearing state stage; and associating the shear response characteristics of each local shear-contributing entity at different shear displacement stages to form a shear response characteristic sequence for characterizing the evolution of local shear contribution with shear displacement.

[0013] Optionally, the shear response characteristics of each local shear contributing entity at different shear displacement stages are correlated to form a shear response characteristic sequence characterizing the evolution of local shear contribution with shear displacement. This includes: performing temporal correlation on the shear response characteristics of each local shear contributing entity at each shear displacement stage according to the evolution order of shear displacement; identifying the local shear contributing entity that plays a dominant role in shear resistance at different shear displacement stages based on the temporal correlation results; wherein, the local shear contributing entity that plays a dominant role in shear resistance is a local shear contributing entity that remains in a bearing state without contact separation or bearing weakening during the corresponding shear displacement stage, and whose bearing state change is synchronous with the change in shear resistance of the structural surface; determining the transfer characteristics of local shear contribution during the shear process based on the changes of the local shear contributing entity corresponding to the dominant shear resistance between adjacent shear displacement stages, and associating the transfer characteristics with the shear response characteristic sequence to obtain the shear response characteristic sequence.

[0014] Optionally, based on the shear response characteristics and corresponding spatial distribution relationships of each local shear contributing entity, the contribution relationship of each local shear contributing entity to the overall shear behavior of the rough structural surface is determined and output. This includes: determining the participation of each local shear contributing entity in the overall shear behavior at the corresponding shear displacement stage based on the bearing state and shear response characteristics of each local shear contributing entity at different shear displacement stages; distinguishing between local shear contributing entities located in the main shear path region and non-main shear path region based on the spatial distribution location of each local shear contributing entity on the structural surface; identifying local shear contributing entities that simultaneously participate in the overall shear behavior and are located in the main shear path region as local shear contributing entities with effective shear contribution at the corresponding shear displacement stage, and outputting the local shear contributing entities with effective shear contribution at each shear displacement stage as the contribution relationship.

[0015] Optionally, after obtaining the contribution relationship between each local shear contributing entity and the overall shear behavior of the rough structural surface, the method further includes: based on the contribution relationship, constructing a shear contribution distribution characterization result of the rough structural surface along the shear direction, used to characterize the action segment of each local shear contributing entity on the structural surface within different shear displacement stages; based on the shear contribution distribution characterization result, identifying local shear contributing entities that undertake shear action multiple times or undergo contribution transfer during the shear process, as key local shear contributing entities; and outputting the key local shear contributing entities and their corresponding shear displacement stage information as feature description results of the shear behavior of the structural surface.

[0016] A second aspect of the present invention provides a system for analyzing the local shear contribution of a rough structural surface. The system includes: a data acquisition unit for acquiring structural surface response data reflecting the evolution of the shear response during shear loading of the rough structural surface; an entity identification unit for identifying multiple local shear contribution entities formed during the shearing process based on the structural surface response data, wherein the local shear contribution entities are local regions of the structural surface that play a dominant role in the overall shear resistance; a feature identification unit for tracking the change in the load-bearing state of each identified local shear contribution entity with the evolution of shear displacement during shear loading and acquiring corresponding shear response features; and a result output unit for determining and outputting the contribution relationship of each local shear contribution entity to the overall shear resistance of the rough structural surface based on the shear response features of each local shear contribution entity and its corresponding spatial distribution relationship.

[0017] On the other hand, the present invention provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the above-described method for analyzing the local shear contribution of rough structural surfaces.

[0018] Through the above technical solution, the present invention can identify and characterize local regions of the structural surface participating in shear load-bearing during shear loading of a rough structural surface, based on the actual shear response information of the structural surface. This overcomes the limitation of existing technologies that can only analyze shear performance at the overall scale. By decomposing the shear behavior of the structural surface into multiple local shear-contributing entities with actual physical significance, and continuously tracking their load-bearing state changes during shear displacement evolution, the present invention can reveal the formation, persistence, and transfer characteristics of local load-bearing regions in different shear stages. Furthermore, by combining the shear response characteristics of the local shear-contributing entities and their spatial distribution relationship on the structural surface, the role of each local region in the overall shear behavior at different shear stages can be clarified. Thus, the present invention achieves a physical analysis of the shear process of a rough structural surface, enabling the overall shear response of the structural surface to correspond to specific load-bearing regions and their evolution mechanisms, providing a more intuitive and physically meaningful technical means for understanding and engineering analysis of the shear mechanical behavior of structural surfaces.

[0019] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of the steps of a method for analyzing the local shear contribution of a rough structural surface provided in one embodiment of the present invention; Figure 2 This is a schematic diagram comparing the peak strength and residual strength of structural surfaces with different roughness under different normal load distributions according to one embodiment of the present invention. Figure 3 This is a detailed flowchart of step S30 of the method for analyzing the local shear contribution of a rough structural surface provided in one embodiment of the present invention. Figure 4 This is a schematic diagram of the shear response evolution curves of various roughness structural surfaces under different normal load distribution forms under 1MPa normal stress conditions provided by one embodiment of the present invention. Figure 5 This is a schematic diagram of the shear response evolution curves of various roughness structural surfaces under different normal load distribution forms under a 2MPa normal stress condition, provided by one embodiment of the present invention. Figure 6 This is a system structure diagram of a rough structural surface local shear contribution analysis system provided in one embodiment of the present invention; Figure 7 This is an internal structural diagram of a computer device provided in one embodiment of the present invention. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] like Figure 1 As shown, embodiments of the present invention provide a method for analyzing the local shear contribution of rough structural surfaces, the method comprising: Step S10: During the shear loading process of the rough structural surface, obtain structural surface response data that reflects the evolution of the shear response of the structural surface.

[0023] Specifically, during shear loading, information on the change of the normal contact state of the structural surface is continuously collected along the shear displacement direction to characterize the contact, compaction, or separation process of local areas of the structural surface under shear action; information on the change of shear force corresponding to the shear displacement is collected simultaneously to reflect the evolution characteristics of the overall shear response of the structural surface with the shear process; the information on the change of the normal contact state and the information on the change of shear force are correlated according to the corresponding shear displacement to form structural surface response data used to characterize the evolution process of the structural surface shear response.

[0024] In this embodiment of the invention, during the application of shear loading to a rough structural surface, multi-source response information reflecting the evolution characteristics of the structural surface's shear response is simultaneously acquired to construct structural surface response data. This structural surface response data is used to characterize the coordinated change relationship between the overall shear resistance response and the local contact state of the structural surface during shearing.

[0025] Specifically, during shear loading, the changes in the normal contact state of the structural surface are continuously monitored along the shear displacement direction. This information on the changes in the normal contact state reflects the physical processes experienced by local areas of the structural surface under shear loading, including contact establishment, local compaction, and local separation. By combining the contact evolution characteristics between the upper and lower plates of the structural surface during the direct shear test, the trajectory of the changes in the contact state of local areas at different shear displacement stages can be obtained, thus reflecting the formation and evolution of local load-bearing areas during shearing.

[0026] Simultaneously, during shear loading, shear force variation information corresponding to shear displacement is collected one-to-one to characterize the evolution of the overall shear response of the structure with shear displacement. By continuously recording the shear force-shear displacement relationship curve formed by the change of shear force with displacement, different response stages experienced by the structure during shearing can be identified, such as the compaction stage, elastic deformation stage, yielding stage, post-peak and residual stages, thereby reflecting the evolution characteristics of the overall shear behavior.

[0027] Specifically, the information on changes in the normal contact state is preferably obtained through a joint acquisition method of normal displacement response and contact stiffness evolution. The experimental setup is equipped with a normal force sensor and a normal displacement sensor in the normal loading direction, and these sensors are synchronously triggered for sampling with the shear displacement acquisition channel, ensuring that each shear displacement sampling point corresponds to a set of normal force and normal displacement values. Using a preset shear displacement step size as a window, the difference between the normal force increment and normal displacement increment within adjacent sampling points is calculated to obtain the equivalent normal contact stiffness sequence within the corresponding window. This equivalent normal contact stiffness is used to characterize the degree of evolution of the structural surface from scattered contact to continuous contact, and from weak contact to compaction and locking.

[0028] Furthermore, the equivalent normal contact stiffness sequence is subjected to moving average and outlier removal processing to avoid misjudgment of local spikes caused by loading fluctuations. The processed equivalent normal contact stiffness and normal displacement change rate are used together as normal contact state discrimination quantities: when the equivalent normal contact stiffness continues to increase and the normal displacement change rate gradually decreases, it is determined that the local area of ​​the structural surface is in a compaction strengthening trend; when the equivalent normal contact stiffness enters the plateau range and the fluctuation amplitude is less than the preset threshold, it is determined that the local area of ​​the structural surface is in a stable contact state; when the equivalent normal contact stiffness shows a continuous decrease or a significant increase in fluctuation, it is determined that the local area of ​​the structural surface has experienced contact weakening or local separation.

[0029] In this way, the measurable response of the normal loading channel is converted into information on the change of normal contact state as shear displacement evolves, and aligned with the shear force-shear displacement response under the same shear displacement coordinate, providing input data for the subsequent identification and tracking of local shear-contributing entities.

[0030] Furthermore, the information on changes in the normal contact state and the information on changes in shear force are correlated according to the corresponding shear displacements, so that changes in the local contact state can correspond to the overall shear response in the same shear displacement coordinate system. Through this correlation method, structural surface response data is generated to characterize the evolution process of the structural surface shear response, providing basic data support for subsequent identification of local shear-contributing entities and analysis of their load-bearing evolution characteristics.

[0031] Through the above implementation methods, this invention simultaneously acquires information on the overall shear response and local normal contact state changes of the structural surface during shear loading, and correlates the two along the shear displacement dimension. This allows the macroscopic mechanical response of the structural surface during shearing to correspond to specific local contact evolution behaviors. Compared to existing technologies that rely solely on shear force-displacement curves for overall analysis, this invention retains local load-bearing information during shearing, enabling the structural surface shear response to move beyond the overall result level and provide the foundation for further identifying local shear contribution regions. This provides physically meaningful input data for subsequent local shear contribution analysis.

[0032] Preferably, the roughness of the structural surface is graded and differentiated, not merely to describe differences in surface morphology, but to reveal the differences in the formation and evolution mechanisms of local shear-contributing entities under different geometric undulations. Structural surface roughness (according to the joint roughness coefficient JRC) is typically divided into intervals such as 0-2, 10-12, and 18-20 to characterize the gradual change in roughness from smooth to moderately rough to highly rough. As the roughness level increases, the height, inclination angle, and spatial distribution complexity of the micro-protrusions on the structural surface significantly increase, and the local load-bearing capacity generated by the interlocking and locking of these micro-protrusions gradually strengthens during shearing.

[0033] In low-roughness structural surfaces, the overall shear behavior is mainly controlled by normal compaction and frictional slip, with fewer and more dispersed local shear contributing entities. However, in medium- to high-roughness structural surfaces, multiple local shear contributing entities with clear spatial locations and sustained load-bearing capacity are formed during shearing, and their load-bearing effect has a significant controlling effect on the overall shear response. Therefore, the roughness classification introduced in this application helps to uniformly describe the identification rules and contribution relationships of local shear contributing entities under different geometric conditions, making the proposed analysis method applicable and comparable across roughness conditions, thus more realistically reflecting the actual shear bearing mechanism of rough structural surfaces.

[0034] In one specific implementation, a direct shear test was conducted on a specimen with a surface roughness of 0-2 mm to obtain surface response data reflecting the evolution of the shear response. The test was conducted with normal stresses of 1 MPa, 2 MPa, and 3 MPa, and four normal load distribution patterns (uniform, right-handed, medium-handed, and left-handed) were set under each normal stress. The shear displacement was applied up to 10 mm, and the shear force and shear displacement were continuously recorded to form a shear strength-shear displacement curve. Taking a normal stress of 2 MPa as an example, the curve shows a significant downward curve within the 0-2 mm shear displacement range, reflecting the disappearance of the contact gap between the specimen and the shear box, the compaction of the upper and lower plates, and the compaction and closure of the original pores. Under some distribution patterns, the curve exhibits micro-convex compaction characteristics between the elastic and yield stages, i.e., the curve slope first decreases and then increases, corresponding to the area circled in red in the figure.

[0035] Further analysis of peak shear displacement revealed that the average peak shear displacement was smallest under uniformly distributed load. Compared to uniformly distributed load, the average peak shear displacement increased by 26.24%, 25.53%, and 84.75% under right-hand, middle-hand, and left-hand loads, respectively. The average peak shear displacement was the largest under left-hand load, indicating that when the load concentration point deviates from the side of the external force acting in the shear direction, a larger displacement is required to reach the peak strength.

[0036] Taking a 0-2 roughness surface under uniformly distributed load as an example, the peak strength increases by 116.67% when the normal stress increases from 1 MPa to 2 MPa, and continues to increase by 40.83% when it increases from 2 MPa to 3 MPa, demonstrating that the peak strength increases non-linearly with normal stress. By aligning and correlating the stage characteristics of the above shear force-displacement curves with the corresponding normal stress and distribution parameters according to shear displacement, structural surface response data is obtained. This data is used to subsequently identify the local regions that bear shear resistance at different shear displacement stages and their contribution relationships.

[0037] Step S20: Based on the structural surface response data, identify multiple local shear contribution entities formed during the shearing process. The local shear contribution entities are local areas of the structural surface that play a dominant role in the overall shear resistance.

[0038] Specifically, based on the structural surface response data, multiple local shear-contributing entities formed during the shearing process are identified, including: based on the normal contact state change characteristics reflected in the structural surface response data, determining local regions on the structural surface that continuously form contact compaction or locking effects during the shearing process as candidate local shear-contributing entities; judging the load-bearing continuity of each candidate local shear-contributing entity during the shear loading process, and selecting local regions that maintain the main load-bearing effect within a preset shear displacement range as the local shear-contributing entities.

[0039] Furthermore, the load-bearing continuity of each candidate local shear-contributing entity during shear loading is determined, and local regions that maintain the dominant load-bearing function within a preset shear displacement range are selected as the local shear-contributing entities. This includes: during shear loading, acquiring the normal contact state change trajectory and shear response change trajectory corresponding to each candidate local shear-contributing entity; based on the normal contact state change trajectory, determining whether each candidate local shear-contributing entity undergoes a continuous evolution process from contact establishment, compaction enhancement to stable load-bearing during shear displacement evolution; based on the shear response change trajectory, determining whether each candidate local shear-contributing entity continuously bears the main shear resistance within the preset shear displacement range; and identifying the candidate local regions that simultaneously meet the contact stability discrimination condition and the load-bearing continuity discrimination condition as the local shear-contributing entities.

[0040] In this embodiment of the invention, based on the aforementioned structural surface response data, local shear-contributing entities formed on the rough structural surface during shear loading are identified. These local shear-contributing entities are local regions of the structural surface that exert a dominant load-bearing effect on the overall shear resistance of the structural surface during shearing; they correspond to regions where continuous contact compaction, locking, or local load concentration occurs during shearing.

[0041] Specifically, based on the characteristics of normal contact state changes reflected in the structural surface response data, local regions on the structural surface that continuously form contact compaction or locking effects during shearing are identified as candidate local shear contribution entities. Combining the staged characteristics of the shear strength-shear displacement curve during the direct shear test, it can be observed that in the initial stage of shear loading, the contact gap between the specimen and the shear box gradually disappears, the upper and lower plates of the structural surface are compressed, and the original pores undergo compaction and closure. At this point, the overall contact state of the structural surface tends to be uniform. As the shear displacement further increases, under specific normal stress levels or normal load distribution patterns, some specimens exhibit a micro-protrusion compaction stage between the elastic and yield stages. The slope of the shear curve corresponding to this stage first decreases and then increases, reflecting a significant compaction or locking effect in local areas of the structural surface. These local regions exhibiting continuous compaction or locking effects are preliminarily identified as candidate local shear contribution entities.

[0042] Based on this, the load-bearing continuity of each candidate local shear-contributing entity during shear loading is determined to screen out local regions that maintain the dominant load-bearing effect within a preset shear displacement range. Specifically, during shear loading, the normal contact state change trajectory and shear response change trajectory corresponding to each candidate local shear-contributing entity are obtained. The normal contact state change trajectory is used to characterize whether the local region maintains contact, undergoes further compaction, or experiences contact weakening during shear displacement evolution; the shear response change trajectory is used to characterize the response characteristics of the local region to the overall shear resistance change during shearing.

[0043] Furthermore, based on the trajectory of the normal contact state change, it is determined whether each candidate local shear contribution entity undergoes a continuous evolution process from contact establishment, compaction enhancement, to stable bearing during the shear displacement evolution. Combined with the original experimental results, it can be seen that joint compression is more likely to occur when the normal stress is 2 MPa or the normal load distribution is right-handed compression, forming a distinct compaction zone in the local contact area. This type of region can maintain a stable contact state for a relatively long time during shearing, without early separation or weakening.

[0044] Simultaneously, based on the shear response change trajectory, it is determined whether each candidate local shear-contributing entity continuously bears the main shear resistance within the preset shear displacement range. Specifically, when the shear strength-shear displacement curve maintains a high slope in the pre-peak stage, and the shear displacement corresponding to the peak shear strength corresponds to the contact compaction stage of the local region, it indicates that the local region plays a major role in bearing the overall shear resistance within the shear displacement range. Conversely, when some samples experience a sharp drop in shear strength after reaching the peak shear strength, and the corresponding region experiences contact weakening or local failure, the region no longer meets the continuous bearing condition.

[0045] Ultimately, candidate local regions that simultaneously satisfy both the contact stability criterion and the load-bearing continuity criterion are identified as local shear-contributing entities. Through this identification process, local regions that play a dominant role in shear behavior can be distinguished from the overall structural response during shear loading, providing a foundation for subsequent analysis of the changes and transfer relationships of local shear contributions at different shear displacement stages.

[0046] Through the above technical solution, this invention can identify the local regions that actually participate in the load-bearing process of a rough structural surface during shear loading, based on the structural surface response data obtained during shear loading, without relying on posterior failure morphology analysis. Compared with existing technologies that only analyze overall shear strength or curve characteristics, this invention introduces the identification process of local shear-contributing entities, enabling the shear-resistant behavior of the structural surface to correspond to specific load-bearing regions and their evolution states. This achieves a physical characterization of the shear-bearing mechanism of the structural surface, providing a reliable basis for subsequent analysis of local shear contribution relationships.

[0047] Specifically, the spatial division of the local shear-contributing entities is determined based on the geometry of the rough structural surface and the shear loading direction. First, before the shear test begins, the surface topography is measured to obtain elevation distribution data within the shear plane, and a two-dimensional spatial coordinate system is established for the structural surface. One coordinate axis is set along the shear displacement direction, and the other axis is set perpendicular to the shear displacement direction. Based on this two-dimensional spatial coordinate system, the structural surface is divided into multiple adjacent mesh units according to a preset spatial resolution. Each mesh unit corresponds to a minimum analysis region on the structural surface, and this minimum analysis region serves as the basic unit for the local region.

[0048] During shear loading, for each local region, its corresponding normal contact state change information and shear load response information are associated to form a local response sequence that evolves with shear displacement. When multiple adjacent local regions exhibit consistent or highly similar normal contact state evolution trends within a preset shear displacement range, and their shear load response changes are synchronized with the overall shear resistance changes, the adjacent local regions are spatially merged to form a candidate local shear resistance contributing entity.

[0049] Furthermore, by continuously tracking the contact stability and load-bearing continuity of the candidate local shear contributing entity in the subsequent shear displacement stage, if it does not experience significant contact separation or load-bearing weakening within the preset shear displacement range, the spatial merging region is determined as a local shear contributing entity.

[0050] In one specific implementation, to address the problem that the overall shear response of a rough structural surface during shear loading is difficult to reflect the local dominant load-bearing behavior, a direct shear test is used to obtain structural surface response data to characterize the evolution of the structural surface shear response, and the local shear contribution entities formed during the shearing process are identified based on the structural surface response data.

[0051] Specifically, structural surface specimens with roughness grades of 0-2, 10-12, and 18-20 were selected, and direct shear tests were conducted under normal stresses of 1 MPa, 2 MPa, and 3 MPa, respectively. During shear loading, the changes in shear displacement and shear force were continuously recorded to obtain the peak strength and residual strength distribution of the structural surface under different normal stress levels. The comparison results of peak strength and residual strength of structural surfaces with different roughness grades under various normal stress conditions are shown below. Figure 2 As shown. By Figure 2 It can be seen that the peak strength generally increases with the increase of normal stress, but the difference between the peak strength and residual strength of specimens with different roughness structures is significantly different, reflecting that their load-bearing capacity decay characteristics during shearing are significantly different.

[0052] Furthermore, to quantitatively characterize the degree of load-bearing capacity attenuation of a structural surface as it evolves from its peak load-bearing state to its residual load-bearing state during shearing, the Strength Loss Rate (SLR) is introduced as a characterization index, defined as follows: Where, σ peak σ is the peak shear strength reached by the structural surface during the shearing process. residual This refers to the residual shear strength after shearing enters the residual stage. The strength loss rate reflects the degree of stress softening effect on the structural surface during shearing, describing the relative proportion of the structural surface's strength decreasing from peak strength to residual strength. (Combined with...) Figure 2 As shown in (a), the results for the 0-2 roughness surface reveal that, as the normal stress gradually increases from 1 MPa to 3 MPa, the difference between the peak strength and residual strength of this type of surface under different normal load distributions is generally small, and the range of variation with normal stress is limited. The corresponding calculated strength loss rate is low, indicating that the overall shear capacity of the surface does not significantly decrease during shear loading. This phenomenon suggests that for relatively smooth surfaces, their shear bearing capacity is mainly controlled by overall friction and uniform contact, with small differences in bearing capacity between local areas, making it difficult to form local shear-contributing entities that continuously dominate the overall shear behavior.

[0053] Combination Figure 2(b) shows that, under the same normal stress conditions, the difference between the peak strength and residual strength of this type of surface is significantly increased, and the overall strength loss rate is higher than that of the 0-2 roughness surface, exhibiting significant differences under different normal load distributions. With increasing normal stress, the strength loss rate shows a nonlinear variation, reflecting the shear response evolution behavior of the surface during shearing, which is dominated by local interlocking, failure, and load redistribution. This indicates that under moderate roughness conditions, local shear-contributing entities that substantially influence the overall shear behavior begin to form on the surface, and their load attenuation process has a significant impact on the overall shear response.

[0054] Combination Figure 2 (c) The results for the 18-20 roughness surface further reveal that, under various normal stress conditions, the difference between peak strength and residual strength is generally large, and the strength loss rate is at a high level, but the trend of change with increasing normal stress is relatively slow. This indicates that in high-roughness surfaces, local interlocking and locking effects contribute significantly to shear resistance in the early stage of shear loading, while the attenuation process of bearing capacity is relatively stable after entering the residual stage. This characteristic reflects that high-roughness surfaces are more likely to form multiple local shear-contributing entities that play a dominant role in the overall shear resistance behavior during shearing, and there is a significant load transfer phenomenon among these entities at different shear stages.

[0055] Therefore, in this embodiment, through comprehensive analysis of indicators such as peak strength, residual strength, shear displacement, and strength loss rate in the structural surface response data, local regions that maintain the dominant load-bearing capacity within a preset shear displacement range are selected on the structural surface, and these local regions are identified as local shear-contributing entities. These local shear-contributing entities characterize the local load-bearing units that play a dominant role in the overall shear resistance of the rough structural surface during shearing, thereby achieving a materialized analysis of the structural surface shear resistance behavior from overall response to local contribution relationship.

[0056] Step S30: During the shear loading process, track the changes in the bearing state of each identified local shear contribution entity as the shear displacement evolves, and obtain the corresponding shear response characteristics.

[0057] Specifically, during shear loading, by continuously tracking each identified local shear-contributing entity, we can obtain its load-bearing state changes with shear displacement and its corresponding shear response characteristics. Using shear displacement as a unified evolution parameter, we can simultaneously analyze the normal contact state and shear load-bearing state of each local shear-contributing entity during shear loading, clarifying the changing load-bearing roles of different local regions at different stages of shear loading. By distinguishing between load-bearing state stages such as contact establishment, compaction enhancement, stable load-bearing, and contact weakening, we avoid the problem of making rough judgments about the shear behavior of structural surfaces based solely on overall shear parameters.

[0058] Furthermore, by correlating the shear response characteristics of each local shear-contributing entity at different shear displacement stages, a shear response characteristic sequence reflecting the evolution of local shear contribution with shear displacement can be formed. This shear response characteristic sequence not only characterizes the load-bearing evolution path of a single local shear-contributing entity during shearing but also reveals the alternation and transfer process of the dominant shear resistance among different local shear-contributing entities. By identifying the local shear-contributing entities that bear the dominant shear resistance at different shear displacement stages, the true load-bearing mechanism of the structural surface's shear behavior can be reflected more accurately, thus providing a reliable basis for the refined analysis and engineering evaluation of the shear performance of rough structural surfaces. Specifically, such as... Figure 3 Step S30 includes the following steps: Step S301: During the shear loading process, the normal contact state and shear bearing state of each local shear-contributing entity are synchronously tracked according to the evolution sequence of shear displacement.

[0059] Specifically, during shear loading, shear displacement is used as a unified evolution parameter. The shear process is discretized into multiple continuous shear displacement sampling points, and the normal contact state and shear bearing state corresponding to each local shear-contributing entity are simultaneously acquired at each shear displacement sampling point. The normal contact state characterizes the contact relationship between the local shear-contributing entity and the opposite structural surface, including whether there is effective contact, the degree of contact compaction, and changes in contact integrity. The shear bearing state characterizes the shear resistance response borne by the local region under the corresponding shear displacement condition.

[0060] In practical implementation, the normal contact state can be characterized based on changes in normal displacement, local contact stiffness, or the evolution of local contact area. Combined with the overall shear force-shear displacement response relationship, the load-bearing behavior of the local shear-contributing entity during the shearing process can be tracked synchronously. Through this method, a correspondence between shear displacement and the load-bearing state of the local shear-contributing entity can be established throughout the shear loading process, providing fundamental data support for subsequent load-bearing state stage identification.

[0061] In another possible implementation, the synchronous tracking in step S301 is not directly based on the instantaneous response of a single local region, but rather introduces load consistency constraints within the shear displacement window to perform steady-state tracking of the load state of the local shear-contributing entity.

[0062] Specifically, during shear loading, a sliding displacement window is constructed using a preset shear displacement increment. Within each displacement window, statistical analysis is performed on the normal displacement change sequence and shear load response sequence corresponding to the same local shear contributing entity. If the normal displacement change direction of the local shear contributing entity remains consistent within the shear displacement window, and the corresponding local shear load response does not exhibit a sudden reversal, then the local shear contributing entity is determined to be in a continuous load-bearing state within the displacement window, and this state is recorded as the effective load-bearing state within the shear displacement interval. If the normal displacement change direction frequently reverses or the shear load response exhibits discontinuous decay within the displacement window, then the local shear contributing entity exhibits unstable load-bearing behavior within the shear displacement interval, and is marked as a transitional load-bearing state during synchronous tracking.

[0063] By introducing displacement window constraints during the shear displacement evolution process, misjudgments caused by instantaneous fluctuations can be effectively suppressed, making the tracking of the bearing state of local shear-contributing entities more closely match the physical characteristics of the gradual evolution of local bearing of the structural surface during actual shearing, and providing a more stable data foundation for the fine division of subsequent bearing state stages.

[0064] Step S302: Based on the change in the normal contact state, according to the different stages corresponding to the shear displacement, identify the bearing state stage of each local shear-contributing entity in each shear displacement stage. The bearing state stage includes any one or more of the following: contact establishment stage, compaction enhancement stage, stable bearing stage, and contact weakening stage.

[0065] Specifically, after continuously tracking the normal contact state of each local shear-contributing entity, the shear process is divided into stages based on the characteristics of the evolution of the normal contact state with shear displacement. When the local shear-contributing entity gradually transforms from initial weak contact or intermittent contact to stable contact, the corresponding shear displacement interval is identified as the contact establishment stage; when the contact state of the local shear-contributing entity is characterized by enhanced contact compaction, increased contact stiffness, or a slowdown in the normal deformation rate, the corresponding shear displacement interval is identified as the compaction enhancement stage; when the local shear-contributing entity maintains a stable contact state within a certain shear displacement interval without significant contact weakening, the shear displacement interval is identified as the stable bearing stage; when the local shear-contributing entity exhibits characteristics such as contact weakening, local separation, or decreased contact stability, the corresponding shear displacement interval is identified as the contact weakening stage.

[0066] By using the above method, the bearing state stage of each local shear-contributing entity at different stages of shear loading can be clearly identified, thus achieving a staged description of the bearing state during the shear process.

[0067] Step S303: Based on the changes in the shear bearing state, obtain the shear response characteristics of each local shear contributing entity in its corresponding bearing state stage.

[0068] Specifically, after identifying the load-bearing state stages, the shear response characteristics of each local shear-contributing entity are extracted in different load-bearing state stages, taking into account the changes in shear load-bearing state. These shear response characteristics include, but are not limited to: the growth rate of shear resistance within the corresponding shear displacement stage, the response characteristics when the shear resistance reaches its peak, the ability to maintain shear resistance within the stable load-bearing stage, and the load-bearing attenuation characteristics after entering the contact weakening stage.

[0069] In practical implementation, the degree of participation of each local shear-contributing entity in the overall shear resistance with shear displacement can be determined by analyzing the trend of the overall shear resistance with shear displacement and combining the spatial positional relationship of each local shear-contributing entity on the structural surface. By extracting the shear response characteristics in stages, the problem of judging the local shear contribution based solely on a single peak parameter can be avoided, making the evolution process of local load-bearing behavior clearer and more traceable.

[0070] Step S304: Associate the shear response features of each local shear contribution entity at different shear displacement stages to form a shear response feature sequence that characterizes the evolution of local shear contribution with shear displacement.

[0071] Specifically, according to the evolution sequence of shear displacement, the shear response characteristics of each local shear-contributing entity at each shear displacement stage are temporally correlated. Based on the temporal correlation results, the local shear-contributing entities that play a dominant role in shear resistance at different shear displacement stages are identified. The dominant local shear-contributing entity is one that remains in a bearing state throughout the corresponding shear displacement stage, without contact separation or bearing weakening, and whose bearing state changes synchronously with the changes in the structural surface shear resistance. Based on the changes of the dominant local shear-contributing entity between adjacent shear displacement stages, the transfer characteristics of local shear contribution during the shear process are determined, and these transfer characteristics are correlated to the shear response characteristic sequence to obtain the shear response characteristic sequence.

[0072] Specifically, the shear response characteristics of each local shear-contributing entity at each shear displacement stage are temporally correlated according to the evolution sequence of shear displacement. In particular, the shear loading process is divided into multiple consecutive shear displacement stages. Within each shear displacement stage, the shear response characteristics of each local shear-contributing entity at the corresponding stage are extracted and arranged in ascending order of shear displacement, thus establishing a temporal sequence relationship between the shear response characteristics of local shear-contributing entities and the evolution of shear displacement. This temporal correlation method avoids fragmented analysis of shear response characteristics between different shear stages, ensuring the continuity and traceability of the load-bearing evolution process of local shear-contributing entities.

[0073] After completing the temporal correlation of shear response characteristics, based on the results, local shear contributing entities that play a dominant role in shear resistance at different shear displacement stages are further identified. Specifically, within each shear displacement stage, the load-bearing state and shear response characteristics of different local shear contributing entities are compared, and local shear contributing entities that remain in a load-bearing state without contact separation or significant load-bearing weakening during that stage are selected. Simultaneously, combined with the response characteristics of the overall shear resistance of the structural surface changing with shear displacement, it is determined whether the change in the load-bearing state of the local shear contributing entity is synchronous with the change in the shear resistance of the structural surface. Local shear contributing entities whose load-bearing state change trend is consistent with the overall shear resistance change trend are identified as local shear contributing entities that play a dominant role in shear resistance during the corresponding shear displacement stage.

[0074] Furthermore, between adjacent shear displacement stages, a comparative analysis is performed on the local shear-contributing entities corresponding to the dominant shear resistance. When a local shear-contributing entity that bears the dominant shear resistance in the previous shear displacement stage experiences a weakening of its bearing capacity, a decrease in contact stability, or is replaced by another local shear-contributing entity to bear the dominant shear resistance in the subsequent shear displacement stage, it is determined that the local shear resistance contribution has shifted during the shearing process. The shift characteristics are used to characterize the change process of the dominant shear resistance among different local shear-contributing entities as shear displacement evolves, including the shear displacement interval in which the shift occurs and the correspondence between the dominant shear-contributing entities before and after the shift.

[0075] Finally, the transfer characteristics of the local shear contribution during the shear process are correlated with the shear response characteristic sequence to form a complete shear response characteristic sequence. By introducing the main shear transfer information into the shear response characteristic sequence, the evolution of the local load-bearing behavior of the rough structural surface during shear loading can be reflected more comprehensively. This avoids static analysis of the shear behavior of the structural surface based solely on a single shear stage or a single load-bearing region, thus improving the completeness and engineering interpretability of the local shear contribution analysis results.

[0076] In one specific implementation, the shear response of structural surfaces with different roughness under direct shear loading is taken as the object, and the changes in the bearing state of local shear-contributing entities as shear displacement evolves are tracked and analyzed. During the shear loading process, the correspondence between the overall shear strength and shear displacement of the structural surface is continuously acquired, and the changes in the normal contact state of local areas are combined to synchronously track multiple identified local shear-contributing entities on the structural surface.

[0077] like Figure 4 As shown, the differences in shear strength-shear displacement curves of structural surfaces with different normal load distributions under the condition of 1 MPa normal force are presented.

[0078] Among them, such as Figure 4 As shown in (a), under uniformly distributed normal load conditions, the stress in each region of the structure is relatively balanced. The contact establishment and load-bearing enhancement process of each local shear-contributing entity are relatively synchronous. The shear strength increases steadily with shear displacement, and the slope of the curve changes gently, without showing obvious local dominant load-bearing characteristics. Figure 4 As shown in (b), under right-side compressive normal load conditions, the local shear-contributing entity near the right side preferentially enters the compaction and strengthening state, and its shear bearing capacity increases earlier. The shear strength-shear displacement curve shows a faster rate of increase in the early and middle stages, reflecting the non-uniform spatial distribution of shear contribution. Figure 4 As shown in (c), under medium-pressure normal load conditions, the central region of the structure becomes the main load-bearing area. Multiple local shear-contributing entities work together to bear the shear load within similar shear displacement ranges, and the shear displacements corresponding to the peak values ​​of the curves are relatively concentrated. Figure 4 As shown in (d), under the left-side normal load, the shear bearing area shifts to the left, and some local shear contributing entities experience bearing weakening after reaching the peak value. The shear strength curve shows a more obvious downward trend after the peak value.

[0079] The aforementioned stage characteristics differ under different roughness conditions. For example, in the 0-2 roughness surface, the local shear-contributing entities enter the stable bearing stage earlier, and the shear strength tends to level off more quickly; while in the 10-12 and 18-20 roughness surface, the local shear-contributing entities remain in the compaction and strengthening stage for a longer period, with peak shear strengths reaching approximately 1.9 MPa and 2.2 MPa, respectively, and the corresponding peak shear displacements also increase significantly. This indicates that the main shear resistance in the rough surface is jointly borne by multiple high-bearing-capacity local shear-contributing entities.

[0080] Furthermore, such as Figure 5 As shown, after the normal force is increased to 2 MPa, under different normal load distributions, the shear strength-shear displacement curves of each roughness structural surface shift upwards overall, and the stable bearing stage of the entity contributing local shear resistance becomes clearer. For example, Figure 5 As shown in (a), under uniformly distributed normal load conditions, each local shear-contributing entity maintains a stable bearing state within a relatively wide shear displacement range. The shear strength changes continuously with displacement. The main shear-contributing entity undergoes frequent transfer during shearing, but the overall bearing capacity remains stable. Figure 5 As shown in (b), under right-hand normal load conditions, the local shear-contributing entity near the right side continuously bears the main shear resistance within a shear displacement range of approximately 4 mm to 6 mm. Its bearing state changes synchronously with the overall shear resistance change, exhibiting a relatively clear dominant shear contribution characteristic. Figure 5 As shown in (c), under medium-pressure normal load conditions, multiple locally contributing shear elements alternately undertake the dominant shear resistance in adjacent shear displacement stages. The shear displacement corresponding to the peak value of the shear strength curve is relatively concentrated, reflecting the staged transfer characteristics of local shear resistance contributions. Figure 5 As shown in (d), under the left-hand normal load, some local shear contributing entities experience contact weakening after reaching the peak value, resulting in a decrease in shear bearing capacity. Subsequently, local shear contributing entities from other regions continue to participate in the bearing, and the shear strength curve shows a more obvious attenuation trend after the peak value.

[0081] By temporally correlating the shear response characteristics of each local shear contribution entity within different shear displacement stages, a shear response characteristic sequence is formed to characterize the evolution of local shear contribution with shear displacement. This allows for a clear depiction of the evolution of the main load-bearing region of the rough structural surface throughout the shear loading process.

[0082] Step S40: Based on the shear response characteristics and corresponding spatial distribution relationships of each local shear contributing entity, determine and output the contribution relationship of each local shear contributing entity to the overall shear behavior of the rough structure surface.

[0083] Specifically, based on the bearing state and shear response characteristics of each local shear contributing entity at different shear displacement stages, the participation of each local shear contributing entity in the overall shear behavior at the corresponding shear displacement stage is determined. Combining the spatial distribution of each local shear contributing entity on the structural surface, local shear contributing entities located in the main shear path region and non-main shear path region are distinguished. Local shear contributing entities that simultaneously participate in the overall shear behavior and are located in the main shear path region are identified as local shear contributing entities with effective shear contribution at the corresponding shear displacement stage, and the local shear contributing entities with effective shear contribution at each shear displacement stage are output as contribution relationships.

[0084] In this embodiment of the invention, after obtaining the shear response characteristics of each local shear contributing entity at different shear displacement stages, this embodiment further determines and outputs the contribution relationship of each local shear contributing entity to the overall shear behavior of the rough structural surface based on the shear response characteristics and their spatial distribution relationship on the structural surface.

[0085] In the specific implementation process, the bearing state of each local shear-contributing entity is comprehensively determined based on the different shear displacement stages obtained during shear loading. This determination is primarily based on whether each local shear-contributing entity is in a continuous contact state, whether it exhibits stable or enhanced shear bearing capacity, and whether its shear response changes are synchronized with the overall shear resistance changes of the structural surface. For local shear-contributing entities that only briefly participate in bearing during a certain shear displacement stage, or whose bearing state rapidly weakens with displacement and leads to contact separation, their participation in the overall shear behavior during that stage is considered low.

[0086] Building upon this, the effectiveness of each local shear-contributing entity in contributing to the overall shear resistance is further differentiated by considering its spatial distribution on the structural surface. Specifically, the main shear path regions on the structural surface are determined by analyzing the shear displacement direction, the relative motion between the upper and lower plates of the specimen, and the location of the main slip bands formed during shearing. Local shear-contributing entities located within these main shear path regions typically bear the primary responsibility for transmitting shear resistance on the structural surface, and their shear response characteristics directly influence the formation of the overall shear strength. Conversely, local shear-contributing entities located in non-main shear path regions, even if they exhibit some load-bearing behavior at a local scale, often have an indirect or secondary effect on the overall shear resistance.

[0087] Therefore, when determining the contribution relationship, only entities that simultaneously meet the following conditions are considered to have effective shear contribution during the corresponding shear displacement stage: 1) The local shear-contributing entity is in a stable contact or stable load-bearing state during the shear displacement stage, and there is no obvious contact separation or load-bearing weakening.

[0088] 2) The shear response characteristics of the local shear-contributing entity are consistent with the overall shear resistance variation trend of the structural surface.

[0089] 3) The local shear-contributing entity is located in the main shear path region in the spatial distribution of the structural surface.

[0090] For local shear contribution entities that meet the above conditions, they are marked as effective shear contribution entities within the corresponding shear displacement stage, and their corresponding spatial location, bearing state stage, and shear response characteristics are recorded. Furthermore, as the shear displacement continues to evolve, comparative analysis of the effective shear contribution entities identified within different shear displacement stages can reveal the appearance, disappearance, or transfer of local shear contribution entities during the shear process, thus forming a contribution relationship result reflecting the evolution of local shear contribution with the shear process.

[0091] Finally, the local shear-contributing entities with effective shear resistance identified within each shear displacement stage, along with their corresponding spatial distribution information, are output as contribution relationships characterizing the formation mechanism of the overall shear behavior of the rough structural surface. These contribution relationships can intuitively reflect the dominant role and evolution of the local bearing region on the overall shear performance under different roughness structural surfaces and different normal load distributions.

[0092] Preferably, after obtaining the contribution relationship between each local shear contributing entity and the overall shear behavior of the rough structural surface, the method further includes: based on the contribution relationship, constructing a shear contribution distribution characterization result of the rough structural surface along the shear direction, used to characterize the action segment of each local shear contributing entity on the structural surface within different shear displacement stages; based on the shear contribution distribution characterization result, identifying local shear contributing entities that undertake shear action multiple times or undergo contribution transfer during the shearing process, as key local shear contributing entities; and outputting the key local shear contributing entities and their corresponding shear displacement stage information as feature description results of the shear behavior of the structural surface.

[0093] In this embodiment of the invention, after obtaining the contribution relationship of each local shear-contributing entity to the overall shear behavior of the rough structural surface, the contribution relationship is further spatialized and staged to form a more expressive characterization result of the shear behavior of the structural surface.

[0094] Specifically, based on the determined participation of each local shear-contributing entity in different shear displacement stages, the structural surface is segmented and mapped along the shear direction. The spatial segments in which each local shear-contributing entity undertakes shear resistance in the corresponding shear displacement stage are marked, thereby constructing a characterization result of the shear contribution distribution of the rough structural surface along the shear direction. This characterization result reflects the local regions on the structural surface that actually participate in shear bearing and their distribution characteristics along the shear direction in different shear displacement stages during shear loading, avoiding the information compression problem caused by describing the shear behavior of the structural surface solely with the overall shear strength curve.

[0095] Based on this, an inter-stage comparative analysis is performed on the shear contribution distribution characterization results to identify local shear contribution entities that repeatedly appear in the shear contribution distribution across multiple shear displacement stages, or local shear contribution entities whose action sections change between adjacent shear displacement stages. These local shear contribution entities are identified as key local shear contribution entities. These key local shear contribution entities reflect critical local regions in the shear behavior of the structural surface that possess sustained bearing capacity or significant contribution transfer characteristics. Finally, the identified key local shear contribution entities and their corresponding shear displacement stage information are output as feature description results of the structural surface's shear behavior, used to characterize the dominant shear resistance segments and their evolution during the shear process.

[0096] In another possible implementation, during the shear loading process, for local shear contributing entities that have been determined to have effective shear contribution in a certain shear displacement stage, their continuous participation in multiple adjacent shear displacement stages is further statistically analyzed to form a corresponding contribution duration index.

[0097] The contribution duration is used to characterize whether the local shear-contributing entity only has a brief effect in a single stage during shearing, or whether it maintains a stable participation in the overall shear behavior across multiple consecutive stages. Simultaneously, based on the spatial division of the structural surface along the shear direction, the changes in the spatial action segments of each local shear-contributing entity within adjacent shear displacement stages are analyzed. If the spatial action segments corresponding to the same local shear-contributing entity remain continuous or exhibit slow migration characteristics across multiple shear displacement stages, it is determined to possess spatial continuity; if its action segments show abrupt changes within adjacent stages, its contribution behavior is determined to have staged or local characteristics.

[0098] Based on the joint analysis results of contribution duration and spatial continuity, only local shear contribution entities that simultaneously meet the preset duration condition and have spatial continuity are ultimately determined as effective shear contribution entities that have a stable contribution to the overall shear behavior of the rough structure surface. Their corresponding shear displacement stage interval, spatial action segment, and shear response characteristics are output as contribution relationship results.

[0099] By introducing the aforementioned joint constraint mechanism, we can avoid misjudging occasional loads or local short-term locked regions as the main shear contribution regions, making the output contribution relationship more consistent with the real physical characteristics of the gradual evolution and spatial migration of shear load on rough structural surfaces during actual shearing, thereby improving the engineering interpretability and stability of the overall shear contribution analysis results.

[0100] like Figure 6As shown, this invention provides a system for analyzing the local shear contribution of a rough structural surface. The system includes: a data acquisition unit for acquiring structural surface response data reflecting the evolution of the shear response during shear loading of the rough structural surface; an entity identification unit for identifying multiple local shear contribution entities formed during the shearing process based on the structural surface response data, wherein the local shear contribution entities are local regions of the structural surface that play a dominant role in the overall shear resistance; a feature identification unit for tracking the change in the load-bearing state of each identified local shear contribution entity as shear displacement evolves during shear loading and obtaining the corresponding shear response features; and a result output unit for determining and outputting the contribution relationship of each local shear contribution entity to the overall shear resistance of the rough structural surface based on the shear response features and corresponding spatial distribution relationships of each local shear contribution entity. The present invention also provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the above-described method for analyzing the local shear contribution of rough structural surfaces.

[0101] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 7 As shown, the computer device includes a processor A01, a network interface A02, memory (not shown), and a database (not shown) connected via a system bus. The processor A01 provides computational and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01, a computer program B02, and a database (not shown). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A06. The network interface A02 is used for communication with external terminals via a network connection. When the computer program B02 is executed by the processor A01, it implements a method for analyzing the local shear contribution of a rough structural surface.

[0102] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0103] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0104] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A method for analyzing the local shear contribution of a rough structural surface, characterized in that, The method includes: During shear loading of a rough surface, obtain surface response data that reflects the evolution of the shear response. Based on the structural surface response data, multiple local shear contribution entities formed during the shearing process are identified. These local shear contribution entities are local areas of the structural surface that play a dominant load-bearing role in the overall shear behavior. During shear loading, the bearing state changes of each local shear contribution entity are tracked and identified as it evolves with shear displacement, and the corresponding shear response characteristics are obtained. Based on the shear response characteristics and spatial distribution relationships of each local shear contributing entity, the contribution relationship of each local shear contributing entity to the overall shear behavior of the rough structure surface is determined and output.

2. The method for analyzing the local shear contribution of rough structural surfaces according to claim 1, characterized in that, During shear loading of a rough structural surface, structural response data reflecting the evolution of the shear response are obtained, including: During shear loading, information on the change of the normal contact state of the structural surface is continuously collected along the shear displacement direction to characterize the contact, compaction or separation process of the local area of ​​the structural surface under shear action. Synchronously collect information on shear force changes corresponding to shear displacement to reflect the evolution characteristics of the overall shear response of the structural surface during the shear process; The information on changes in normal contact state and the information on changes in shear force are correlated with the corresponding shear displacements to form structural surface response data that characterizes the evolution of the structural surface shear response.

3. The method for analyzing the local shear contribution of rough structural surfaces according to claim 1, characterized in that, Based on the structural surface response data, multiple local shear-contributing entities formed during the shearing process are identified, including: Based on the characteristics of normal contact state changes reflected in the structural surface response data, local regions that continuously form contact compaction or locking effects during shearing are identified on the structural surface as candidate local shear resistance contributing entities. The load-bearing continuity of each candidate local shear-contributing entity during shear loading is judged, and the local region that maintains the main load-bearing effect within the preset shear displacement range is selected as the local shear-contributing entity.

4. The method for analyzing the local shear contribution of rough structural surfaces according to claim 3, characterized in that, The load-bearing continuity of each candidate local shear-contributing entity during shear loading is evaluated, and local regions that maintain the dominant load-bearing effect within a preset shear displacement range are selected as the local shear-contributing entities, including: During the shear loading process, the normal contact state change trajectory and shear response change trajectory corresponding to each candidate local shear contribution entity are obtained respectively; Based on the trajectory of the change in the normal contact state, it is determined whether each candidate local shear contribution entity undergoes a continuous evolution process from contact establishment, compaction enhancement to stable bearing during the shear displacement evolution process; Based on the shear response change trajectory, it is determined whether each candidate local shear resistance contributing entity continuously bears the main shear resistance within the preset shear displacement range; Candidate local regions that simultaneously satisfy both the contact stability criterion and the load-bearing continuity criterion are identified as the local shear-contributing entities.

5. The method for analyzing the local shear contribution of rough structural surfaces according to claim 1, characterized in that, During shear loading, the bearing state changes of each identified local shear-contributing entity are tracked and analyzed as shear displacement evolves, and the corresponding shear response characteristics are obtained, including: During shear loading, the normal contact state and shear bearing state of each local shear-contributing entity are synchronously tracked according to the evolution sequence of shear displacement. Based on the change in the normal contact state, according to the different stages corresponding to the shear displacement, the bearing state stage of each local shear-contributing entity in each shear displacement stage is identified. The bearing state stage includes any one or more of the contact establishment stage, compaction enhancement stage, stable bearing stage and contact weakening stage. Based on the changes in the shear bearing state, the shear response characteristics of each local shear contributing entity in each bearing state stage are obtained. The shear response characteristics of each local shear contribution entity at different shear displacement stages are correlated to form a shear response characteristic sequence that characterizes the evolution of local shear contribution with shear displacement.

6. The method for analyzing the local shear contribution of rough structural surfaces according to claim 5, characterized in that, The shear response characteristics of each local shear contribution entity at different shear displacement stages are correlated to form a shear response characteristic sequence characterizing the evolution of local shear contribution with shear displacement, including: According to the evolution order of shear displacement, the shear response characteristics of each local shear contributing entity at each shear displacement stage are correlated in time. Based on the temporal correlation results, local shear-contributing entities that play a dominant role in shear resistance at different shear displacement stages are identified; among them; The local shear contribution entity that controls the shear resistance is a local shear contribution entity that is continuously in a bearing state during the corresponding shear displacement stage, without contact separation or bearing weakening, and whose bearing state change is synchronous with the change of shear resistance of the structural surface. Based on the changes of the local shear contribution entity corresponding to the main shear action between adjacent shear displacement stages, the transfer characteristics of the local shear contribution during the shear process are determined, and the transfer characteristics are associated with the shear response characteristic sequence to obtain the shear response characteristic sequence.

7. The method for analyzing the local shear contribution of rough structural surfaces according to claim 1, characterized in that, Based on the shear response characteristics and corresponding spatial distribution relationships of each local shear contributing entity, the contribution relationship of each local shear contributing entity to the overall shear behavior of the rough structure surface is determined and output, including: Based on the bearing state and shear response characteristics of each local shear contributing entity at different shear displacement stages, the participation of each local shear contributing entity in the overall shear behavior at the corresponding shear displacement stage is determined. Based on the spatial distribution of each local shear contributing entity on the structural surface, distinguish between local shear contributing entities located in the main shear path region and non-main shear path region; Local shear contribution entities that simultaneously satisfy the requirements of participating in the overall shear resistance behavior and are located in the main shear path region are identified as local shear contribution entities with effective shear resistance contribution in the corresponding shear displacement stage, and the local shear contribution entities with effective shear resistance contribution in each shear displacement stage are output as contribution relationships.

8. The method for analyzing the local shear contribution of rough structural surfaces according to claim 1, characterized in that, After obtaining the contribution relationship between each local shear-contributing entity and the overall shear behavior of the rough structure surface, the method further includes: Based on the aforementioned contribution relationship, a characterization result of the shear contribution distribution along the shear direction of the rough structural surface is constructed, which is used to characterize the action segment of each local shear contribution entity on the structural surface within different shear displacement stages; Based on the shear contribution distribution characterization results, local shear contribution entities that have undertaken shear resistance multiple times or experienced contribution transfer during the shearing process are identified as key local shear contribution entities. The key local shear contribution entities and their corresponding shear displacement stage information are output as feature description results of the structural surface shear behavior.

9. A system for analyzing the local shear contribution of a rough structural surface, characterized in that, The system includes: The acquisition unit is used to acquire structural surface response data reflecting the evolution of the shear response of the structural surface during the shear loading process of the rough structural surface; The entity recognition unit is used to identify multiple local shear-contributing entities formed during the shearing process based on the structural surface response data. The local shear-contributing entities are local areas of the structural surface that play a dominant load-bearing role in the overall shear behavior. The feature recognition unit is used to track the changes in the bearing state of each identified local shear contribution entity as shear displacement evolves during shear loading, and to obtain the corresponding shear response features. The result output unit is used to determine and output the contribution relationship of each local shear contributing entity to the overall shear behavior of the rough structure surface based on the shear response characteristics and corresponding spatial distribution relationship of each local shear contributing entity.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the method for analyzing the local shear contribution of rough structural surfaces as described in any one of claims 1-8.

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