A tunnel stability evaluation method and system based on elastoplastic analysis of soil in cold regions

Abstract

The present invention provides a method and a system for evaluating the stability of a tunnel based on elastoplastic analysis of soil in cold regions. The method includes: conducting a first evaluation of the stability of the tunnel based on elastoplastic analysis of soil in cold regions to obtain a first evaluation result; generating a visual evaluation model based on the first evaluation result; guiding and interactively assisting a user to conduct a second evaluation of the stability of the tunnel based on the visual evaluation model to obtain a second evaluation result; and outputting the second evaluation result. By conducting a first evaluation of the stability of the tunnel based on elastoplastic analysis of soil in cold regions to obtain a first evaluation result, generating a visual evaluation model based on the first evaluation result, guiding and interactively assisting a user to conduct a second evaluation of the stability of the tunnel based on the visual evaluation model to obtain a second evaluation result, and outputting the second evaluation result, it interactively assists experts in evaluating the stability of the tunnel, reduces labor costs, and improves the safety management level of tunnel engineering in cold regions.

Description

Technical Field

[0001] The present invention relates to the technical field of computer data processing, and particularly relates to a method and a system for evaluating the stability of a tunnel based on elastoplastic analysis of soil in cold regions. Background Art

[0002] The development of the plastic zone of the soil around a tunnel in cold regions is one of the most important factors controlling the stability of the tunnel in cold regions. In cold regions, the tunnel and its surrounding medium are very susceptible to the influence of the external extreme environment. Due to the influence of temperature changes, the liquid water in the medium will be frozen and volume expansion will occur. The volume expansion will be restricted by the lining and the unfrozen soil around the tunnel, generating forces acting on the lining, and these forces are called frost heaving forces. Due to the influence of the frost heaving forces in frozen soil, the stress in the surrounding medium will increase. When the stress exceeds the yield stress, the plastic zone begins to develop. The appearance of frost heaving forces will cause a significant expansion of the plastic zone in the surrounding medium. As the plastic zone increases, the tunnel will become unstable. If the frost heaving forces acting on the lining are large enough, the lining will be damaged and the stability of the tunnel will be further damaged. In addition, the deterioration of the geotechnical properties caused by freeze-thaw cycles and the non-uniformity of frost heaving will exacerbate the complexity of the problem. Therefore, it is necessary to continuously evaluate the stability of the tunnel.

[0003] Traditional methods for evaluating the stability of tunnels often rely entirely on manual experience, lacking a method for computer interactive assistance to experts in evaluating the stability of tunnels, which increases the labor cost and results in a low safety management level for tunnel engineering in cold regions.

[0004] Therefore, there is an urgent need for a solution. Summary of the Invention

[0005] One object of the present invention is to provide a method for evaluating the stability of a tunnel based on elastoplastic analysis of soil in cold regions. Based on the elastoplastic analysis of soil in cold regions, a first evaluation of the stability of the tunnel is carried out to obtain a first evaluation result. Based on the first evaluation result, a visual evaluation model is generated to guide and interactively assist the user to carry out a second evaluation of the stability of the tunnel based on the visual evaluation model, obtain a second evaluation result, and output the second evaluation result, realizing computer interactive assistance to experts in evaluating the stability of tunnels, reducing the labor cost, and improving the safety management level of tunnel engineering in cold regions.

[0006] A method for evaluating the stability of a tunnel based on elastoplastic analysis of soil in cold regions provided by an embodiment of the present invention includes:

[0007] Based on the elastoplastic analysis of soil in cold regions, a first evaluation of the stability of the tunnel is carried out to obtain a first evaluation result;

[0008] Based on the first evaluation result, a visual evaluation model is generated;

[0009] Guide and interactively assist the user to conduct a second evaluation of the tunnel stability based on the visual evaluation model, and obtain the second evaluation result;

[0010] Output the second evaluation result.

[0011] Optionally, the first evaluation of the tunnel stability based on the elastoplastic analysis of cold region soil includes:

[0012] Conduct a first evaluation of the tunnel stability based on the elastoplastic simplified dynamic model of the uneven frost heaving soil around the cold region tunnel.

[0013] Optionally, the generation of the visual evaluation model based on the first evaluation result includes:

[0014] Perform content mapping between the first evaluation result and the content mapping atlas, and determine multiple content trees and the tree relationships and tree weights of each content tree from the content mapping atlas; wherein, the content tree includes: a tree structure in which all tree nodes attached in the content mapping atlas are mapped with sub - contents in the first evaluation result; the tree relationship includes: the association relationship between the content tree and other content trees; the tree weight includes: the weight value of the content tree in the weight value table corresponding to the union of all content trees;

[0015] Based on the tree setting rules, set each content tree on the timeline; wherein, the tree setting rules include: set each content tree on the timeline in descending order of tree weight, and set the content tree with the largest tree weight at the beginning of the timeline. When there is the same tree relationship between two adjacent content trees, the interval between the corresponding two adjacent content trees on the timeline is the first standard interval value, otherwise, the interval between the corresponding two adjacent content trees on the timeline is the second standard interval value of the difference between the tree weights of the corresponding two adjacent content trees in the interval value table; the length of the spanning interval of each content tree on the timeline is the standard length value;

[0016] Based on the visualization rules, perform visual configuration on the basic model according to the timeline after all content trees are set; wherein, the visualization rules include: the virtual pointer starts to move from the starting point of the timeline after all content trees are set. When moving to the spanning interval, control the basic model to visualize the sub - contents in the first evaluation result of all tree nodes attached to the content tree of the moved - to spanning interval;

[0017] Take the basic model after the visual configuration is completed as the visual evaluation model.

[0018] Optionally, the guide and interactively assist the user to conduct a second evaluation of the tunnel stability based on the visual evaluation model includes:

[0019] Give guiding prompts to the user;

[0020] When the user confirms the guidance, display the visual evaluation model to the user;

[0021] Extract features from the interaction information generated by the user's interaction with the visual evaluation model within the target time interval to obtain multiple interaction features;

[0022] Match each interaction feature with multiple standard interaction features respectively;

[0023] Determine the target auxiliary knowledge from the auxiliary knowledge base; the target auxiliary knowledge in the auxiliary knowledge base is indicated by the most standard interaction features that match at least one interaction feature;

[0024] Parse the target auxiliary knowledge to obtain multiple auxiliary rules and the rule priority of each auxiliary rule;

[0025] Execute each auxiliary rule in descending order of rule priority to assist the user in future interaction with the visual evaluation model; among them, when executing one auxiliary rule each time, when the user confirms the auxiliary rule executed this time, then execute the next auxiliary rule;

[0026] Among them, the start time of the target time interval is the time when the virtual pointer moves to a new crossing interval each time after passing through N crossing intervals, and the end time of the target time interval is the time when the user's last active operation on the visual evaluation model ends before the end point of the new crossing interval where the virtual pointer moves to this time; N is a positive integer;

[0027] Or,

[0028] The start time of the target time interval is the time when the user starts a passive operation on the visual evaluation model for the first time, and the end time of the target time interval is the time when the user ends the passive operation on the visual evaluation model this time.

[0029] Optionally, the output of the second evaluation result includes:

[0030] Display the second evaluation result to the evaluation result requester.

[0031] A tunnel stability evaluation system based on elastoplastic analysis of cold region soil bodies provided by an embodiment of the present invention includes:

[0032] A first evaluation module for performing a first evaluation on the stability of the tunnel based on elastoplastic analysis of cold region soil bodies to obtain a first evaluation result;

[0033] A generation module for generating a visual evaluation model based on the first evaluation result;

[0034] The second evaluation module is used to guide and interactively assist the user to conduct a second evaluation of the tunnel stability based on the visual evaluation model, and obtain the second evaluation result;

[0035] The output module is used to output the second evaluation result.

[0036] Optionally, the first evaluation module conducts a first evaluation of the tunnel stability based on the elastoplastic analysis of cold region soil mass, including:

[0037] Conduct a first evaluation of the tunnel stability based on the elastoplastic simplified dynamic model of non-uniform frost heaving soil mass around the cold region tunnel.

[0038] Optionally, the generation module generates a visual evaluation model based on the first evaluation result, including:

[0039] Perform content mapping between the first evaluation result and the content mapping atlas, and determine multiple content trees and the tree relationships and tree weights of each content tree from the content mapping atlas; wherein, the content tree includes: a tree structure in which all tree nodes attached in the content mapping atlas are mapped with sub-contents in the first evaluation result; the tree relationship includes: the association relationship between the content tree and other content trees; the tree weight includes: the weight value of the content tree in the weight value table corresponding to the union of all content trees;

[0040] Based on the tree setting rules, set each content tree on the timeline; wherein, the tree setting rules include: set each content tree on the timeline in descending order of tree weight, and set the content tree with the largest tree weight at the beginning of the timeline. When there is the same tree relationship between two adjacent content trees, the interval between the corresponding two adjacent content trees on the timeline is the first standard interval value, otherwise, the interval between the corresponding two adjacent content trees on the timeline is the second standard interval value of the tree weight difference between the corresponding two adjacent content trees in the interval value table; the length of the spanning interval of each content tree on the timeline is the standard length value;

[0041] Based on the visualization rules, perform visual configuration on the basic model according to the timeline after all content trees are set; wherein, the visualization rules include: the virtual pointer starts to move from the starting point of the timeline after all content trees are set. When moving to the spanning interval, control the basic model to visualize the sub-contents in the first evaluation result of all tree nodes attached to the content tree of the moved spanning interval;

[0042] Take the basic model after the visual configuration is completed as the visual evaluation model.

[0043] Optionally, the second evaluation module guides and interactively assists the user to conduct a second evaluation of the tunnel stability based on the visual evaluation model, including:

[0044] Give guiding prompts to the user;

[0045] When the user confirms the guidance, display the visual evaluation model to the user;

[0046] Extract features from the interaction information generated by the user's interaction with the visual evaluation model within the target time interval to obtain multiple interaction features;

[0047] Match each interaction feature with multiple standard interaction features respectively;

[0048] Determine the target auxiliary knowledge from the auxiliary knowledge base; the target auxiliary knowledge in the auxiliary knowledge base is indicated by the most standard interaction features that match at least one interaction feature;

[0049] Parse the target auxiliary knowledge to obtain multiple auxiliary rules and the rule priorities of each auxiliary rule;

[0050] Execute each auxiliary rule in descending order of rule priority to assist the user in future interaction with the visual evaluation model; among them, when executing one auxiliary rule each time, when the user confirms the auxiliary rule executed this time, then execute the next auxiliary rule;

[0051] Among them, the start time of the target time interval is the time when the virtual pointer moves to a new spanning interval each time after passing through N spanning intervals, and the end time of the target time interval is the time when the user's last active operation on the visual evaluation model ends before the end point of the new spanning interval moved to this time; N is a positive integer;

[0052] Or,

[0053] The start time of the target time interval is the time when the user starts a passive operation on the visual evaluation model once, and the end time of the target time interval is the time when the user ends this passive operation on the visual evaluation model.

[0054] Optionally, the output module outputs a second evaluation result, including:

[0055] Display the second evaluation result to the evaluation result requester.

[0056] Other features and advantages of the present invention will be described in the subsequent specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the written specification and the drawings.

[0057] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0058] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the accompanying drawings:

[0059] Figure 1 It is a schematic diagram of a method for evaluating the stability of a tunnel based on elastoplastic analysis of cold region soil in an embodiment of the present invention;

[0060] Figure 2 It is a schematic diagram of a simplified elastoplastic model of a cold region tunnel buried in frost-susceptible soil in an embodiment of the present invention;

[0061] Figure 3 It is a schematic diagram of a system for evaluating the stability of a tunnel based on elastoplastic analysis of cold region soil in an embodiment of the present invention. Detailed implementation manners

[0062] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to explain and illustrate the present invention and are not used to limit the present invention.

[0063] An embodiment of the present invention provides a method for evaluating the stability of a tunnel based on elastoplastic analysis of cold region soil, as Figure 1 shown, including:

[0064] S1. Based on the elastoplastic analysis of cold region soil, conduct a first evaluation of the stability of the tunnel to obtain a first evaluation result;

[0065] S2. Generate a visual evaluation model based on the first evaluation result;

[0066] S3. Guide and interactively assist the user to conduct a second evaluation of the stability of the tunnel based on the visual evaluation model to obtain a second evaluation result;

[0067] S4. Output the second evaluation result.

[0068] Based on the visual evaluation model, the user can conduct an in-depth analysis of the stability of the tunnel; during the in-depth analysis, the system guides and interactively assists the user to improve the efficiency of the in-depth analysis; after the in-depth analysis is completed, a final second evaluation of the stability of the tunnel is conducted, and the second evaluation result is output.

[0069] Based on the elastoplastic analysis of soil in cold regions, a first evaluation of the stability of the tunnel is carried out to obtain a first evaluation result. Based on the first evaluation result, a visual evaluation model is generated to guide and interactively assist the user to conduct a second evaluation of the stability of the tunnel based on the visual evaluation model, obtain a second evaluation result, and output the second evaluation result, realizing computer interactive assistance for experts to evaluate the stability of the tunnel, reducing labor costs, and improving the safety management level of tunnel engineering in cold regions.

[0070] Specifically, based on the elastoplastic analysis of soil in cold regions, the first evaluation of the stability of the tunnel includes:

[0071] Based on the elastoplastic simplified dynamic model of non-uniform frost-heaving soil around the tunnel in cold regions, a first evaluation of the stability of the tunnel is carried out.

[0072] It is very important to study the plastic zone of the soil layer around the tunnel in cold regions and the stress distribution and deformation of each medium layer around the tunnel, including the lining, frozen soil area and unfrozen soil area. The appearance of the plastic zone and the frost-heaving stress at the inner and outer edges of the frozen soil layer in the medium around the tunnel in cold regions is mainly affected by two types of factors: the constraint conditions and the characteristics of the frozen soil layer. The first constraint condition includes the constraint of force and the constraint of displacement; the second factor is based on the properties and fabric of the surrounding frozen soil layer. The increase in the elastic modulus of frozen soil will improve the constraint ability of the frozen soil layer, generate a larger frost-heaving force, and thus it is easier to reach the plastic state. In addition, the soil stress, the elastic modulus of the soil in the unfrozen area, and the shear modulus will also affect the development of the radius of the plastic zone by controlling the frost-heaving deformation. If the change of these parameters reduces the restrictive frost-heaving deformation, the plastic zone will also expand. The above-mentioned factors are related to the constraints, while the remaining factors are related to the characteristics of the surrounding frozen soil. The internal friction angle and the shear modulus both affect the shear strength, and the shear strength will increase with the increase of these factors, thus affecting the plastic zone. In addition, the thickness of the frozen soil layer and the linear strain caused by frost heaving will also control the deformation caused by frost heaving, and the increase of these parameters will also increase the frost-heaving deformation and the plastic radius.

[0073] Therefore, the study on the development law of the plastic region caused by freezing in the medium around cold-region tunnels is of great significance, and there are also more and more research results. However, when external loads act on the lining, the complexity of the problem increases. Considering that the vibration problem caused by train operation is inevitable, the elastoplastic simplified dynamic study of the unevenly frost-heaved soil around cold-region tunnels is more in line with the actual situation. To study the elastoplastic simplified dynamic problem of the incompletely frost-heaved soil around cold-region tunnels, this application studies the vibration responses of the lining, plastic frozen soil region, elastic frozen soil region, and non-frozen soil under the action of loads when the soil around the lining is unevenly frost-heaved in the frequency domain, deduces the analytical expressions of the displacements and stresses of the non-frozen soil, plastic frozen soil region, elastic frozen soil region, and lining under the action of loads, determines the undetermined coefficients according to the continuity conditions, and discusses the influence of factors such as the uneven frost-heave coefficient, external load amplitude, and thickness of the elastic frozen soil region on the dynamic response of the soil tunnel in cold regions considering the plastic region, so as to conduct the first evaluation of the tunnel stability. The results of the first evaluation only include: the vibration responses of the lining, plastic frozen soil region, elastic frozen soil region, and non-frozen soil under the action of loads when the soil around the lining is unevenly frost-heaved, and the influence of factors such as the uneven frost-heave coefficient, external load amplitude, and thickness of the elastic frozen soil region on the dynamic response of the soil tunnel in cold regions considering the plastic region, etc.

[0074] The soil around the tunnel buried in cold regions is mostly permafrost or seasonal frozen soil. Due to the low external temperature, the soil layer around the tunnel is extremely vulnerable to the influence of the external temperature, and some soil layers will also deteriorate. Therefore, an elastoplastic simplified dynamic model of the unevenly frost-heaved soil around the cold-region tunnel as shown in Figure 2 is established. From the inside to the outside, the model is successively the lining in Region I, the plastic frozen soil layer in Region II, the elastic frozen soil layer in Region III, and the elastic non-frozen soil layer in Region IV. The distances from the center O to the inner surface of the tunnel lining, the contact surface between the lining and the plastic frozen soil, the contact surface between the plastic frozen soil and the elastic frozen soil, and the freezing surface are R1, R2, R3, and R4 respectively. d1 = R2 - R1, d2 = R3 - R2, and d3 = R4 - R3 are the lining thickness, the thickness of the plastic frozen soil layer, and the thickness of the elastic frozen soil layer respectively. The lining inner surface is subjected to a radially uniformly distributed harmonic load with a magnitude of q0e iωt . Among them, ω is the circular frequency, and i 2 = -1. σ f , σ p , σ u and p0 are the radial stresses between the lining and the plastic frozen soil layer, the radial stresses between the plastic frozen soil layer and the elastic frozen soil layer, the radial stresses between the elastic frozen soil layer and the non-frozen soil layer, and the initial ground stress respectively.

[0075] Regarding the temperature as uniformly varying in the soil along the freezing direction, the uneven frost-heave coefficient during the frost heave of frozen soil can be obtained from the ratio of the linear frost heave rates in the horizontal and vertical directions (α / / / α ⊥)Approximately the ratio of the linear frost heave rate in the radial direction to that in the circumferential direction (α r / α θ ). The volumetric frost heave rate ε v of the frozen soil around the tunnel in cold regions, the non-uniform frost heave coefficient k, the radial linear frost heave rate, and the circumferential linear frost heave rate have the following relationships:

[0076]

[0077] To solve the elastoplastic dynamic response problem of tunnels in cold regions when non-uniform frost heave occurs in the surrounding soil mass, based on the complexity of the dynamic problems of frozen soil in cold regions, the following assumptions are made:

[0078] (1) The cross-section of the tunnel is circular, and it is assumed to be a plane strain problem. The lining is regarded as an isotropic elastic material, and the plastic region of the frozen soil is regarded as an ideal plastic material.

[0079] (2) The soil mass is regarded as having non-uniform frost heave, and the frost heave process of the soil mass is not considered.

[0080] (3) The soil mass and ice particles are immovable, and the influence of water migration on the dynamic response is ignored. The influence of the energy loss of each component during freezing and thawing on the dynamic response is not considered.

[0081] (4) Possible thermal effects and chemical effects are excluded, and the hysteresis of capillary pressure is also excluded.

[0082] The control equation of the lining is as follows:

[0083] According to the theory of elasticity, regarding the lining domain as an ideal elastic body, the motion equation of the lining is

[0084]

[0085] Where: and are the radial stress and circumferential stress of the lining respectively, is the radial displacement of the lining; ρ L is the density of the lining, t represents time, and r is the radius.

[0086] The constitutive equations of the lining can be written respectively as:

[0087]

[0088] Where: and are the strains in the radial and circumferential directions of the lining respectively. E L and ν L are the Young's modulus and Poisson's ratio of the lining respectively. The Young's modulus, Poisson's ratio, and shear modulus μ L of the lining have the following relationship:

[0089]

[0090] Combined with Equation (6-6), by transforming Equations (6-4) and (6-5), the stress expression of the lining can be obtained:

[0091]

[0092] For an ideal elastic medium, the following geometric conditions need to be satisfied:

[0093]

[0094] Substituting Equations (6-7) to (6-10) into Equation (6-3), we can get

[0095]

[0096] For steady-state vibration, it can be assumed that represents the dimensionless radial displacement of the lining. The following dimensionless quantities and constants are introduced:

[0097]

[0098] Combined with Equation (6-12), Equation (6-11) can be transformed as follows:

[0099]

[0100] Where:

[0101] Using the boundary conditions, Equation (6-13) can be solved to obtain

[0102]

[0103] Where: A1 and A2 are undetermined coefficients, J1(hη) is the Bessel function of the first kind, K1(hη) is the Bessel function of the second kind, and the subscript 1 is the order.

[0104] The governing equation of the soil in the unfrozen region is as follows:

[0105] According to the theory of elasticity, regarding the unfrozen soil region as an ideal elastic body, the motion equation of the soil in the unfrozen region is

[0106]

[0107] Where: and are the radial stress and circumferential stress of the soil in the unfrozen region respectively, is the radial displacement of the soil in the unfrozen region; ρ u is the density of the soil in the unfrozen region.

[0108] The constitutive equations of the unfrozen soil region can be written respectively as

[87] :

[0109]

[0110] Where: and are the radial and circumferential strains of the unfrozen soil respectively; E u and ν u are the Young's modulus and Poisson's ratio of the unfrozen soil respectively. The Young's modulus, Poisson's ratio and shear modulus μ of the unfrozen soil u have the following relationship:

[0111]

[0112] Combined with Equation (6-18), by deforming Equations (6-16) and (6-17), the stress expression of the soil in the unfrozen region can be obtained:

[0113]

[0114] For the soil in the unfrozen region, the following geometric conditions need to be satisfied:

[0115]

[0116] Substituting Equations (6-19) to (6-22) into Equation (6-15), we can get

[0117]

[0118] For steady-state vibration, it can be assumed that represents the dimensionless radial displacement of the soil in the unfrozen region. The following dimensionless quantities are introduced:

[0119]

[0120] Combined with Equation (6-24), Equation (6-23) can be deformed as follows:

[0121]

[0122] Where:

[0123] According to the properties of Bessel functions (η→∞), Equation (6-25) can be solved as:

[0124]

[0125] Where: A3 is a coefficient to be determined.

[0126] The governing equations of the elastic frozen soil region are as follows:

[0127] The motion equation of the soil in the elastic freezing zone can be expressed as

[0128]

[0129] Where: and are the radial stress and circumferential stress of the soil in the elastic freezing zone respectively; is the radial displacement of the soil in the elastic freezing zone, and ρ f is the density of the soil in the elastic freezing zone.

[0130] Based on the theory of non-uniform frost heave of frozen soil and elastic theory, the constitutive equation of the soil in the freezing zone is

[86]

[0131]

[0132] Where: and are the radial and circumferential strains of the soil in the elastic freezing zone respectively, and ε r and ε θ are the radial and circumferential strains of the soil in the frozen soil zone respectively, and are the radial and circumferential strains of the soil in the plastic freezing zone respectively. E f and ν f are the Young's modulus and Poisson's ratio of the frozen soil respectively. The Young's modulus, Poisson's ratio and shear modulus μ of the frozen soil f have the following relationship:

[0133]

[0134] Combined with Equation (6-30), by deforming Equations (6-28) and (6-29), the stress expression of the soil in the elastic frozen soil zone can be obtained:

[0135]

[0136] For the soil in the elastic frozen soil zone, the following geometric conditions need to be satisfied:

[0137]

[0138] Substituting Equations (6-31) to (6-34) into Equation (6-27), we can get

[0139]

[0140] For steady-state vibration, it can be assumed that represents the dimensionless radial displacement of the soil in the elastic frozen soil zone. The following dimensionless quantities are introduced:

[0141]

[0142] Combined with Equation (6-36), (6-35) can be obtained and transformed as follows:

[0143]

[0144] Where:

[0145] Using the boundary conditions, Equation (6-37) can be solved to obtain

[0146]

[0147] Where: A4 and A5 are undetermined coefficients.

[0148] The following is the control equation of the soil in the frozen plastic region:

[0149] The stress in the soil of the plastic frozen region satisfies the following compatibility equation

[0150]

[0151] Also, according to the commonly used linear flow rule of geotechnical materials, it can be known that the soil in the plastic frozen region satisfies

[0152]

[0153] Where: ψ is the dilation angle.

[0154] At the same time, according to Equations (6-28) and (6-29), it can be known that

[0155]

[0156] Combining Formulas (6-39) to (6-42) gives

[0157]

[0158] By non-dimensionalizing Equations (6-33) and (6-34), the following can be obtained

[0159]

[0160] Substituting Equations (6-44) and (6-45) into Equation (6-43), the following can be obtained

[0161]

[0162] Solving Equation (6-46) gives

[0163]

[0164] Where: B1 is an undetermined coefficient.

[0165] Substituting Equation (6-47) into Equation (6-40), we can obtain

[0166]

[0167] Substituting Equations (6-44), (6-45), (6-47) and (6-48) into Equations (6-41) and (6-42), the soil strain in the plastic frozen soil region can be obtained

[0168]

[0169] The motion equation of the soil in the plastic frozen soil region can be expressed as

[0170]

[0171] Where: and are the radial stress and circumferential stress of the soil in the plastic frozen soil region respectively, is the radial displacement of the soil in the plastic frozen soil region.

[0172] For the soil in the plastic frozen soil region, the following geometric conditions need to be satisfied:

[0173]

[0174] Substituting Equations (6-44), (6-45), (6-47) and (6-48) into Equations (6-41) and (6-42) and combining with Equations (6-28) and (6-29), the soil stress in the plastic frozen soil region can be obtained

[0175]

[0176] Where: υ1 = (2ν f -1)(ν f -1)η, υ2 = h3(ν f -1) 2 η 2 ,υ3 = h3(ν f -1)ν f η 2 .

[0177] For steady-state vibration, it can be assumed that represents the dimensionless radial displacement of the soil in the plastic frozen soil region. The following dimensionless quantities are introduced:

[0178]

[0179] Substituting Equations (6-49), (6-50), (6-52)~(6-55) into Equation (6-51) and using the boundary conditions, Equation (6-58) can be solved as

[0180]

[0181] The following are the boundary conditions:

[0182] It is assumed that the lining is in full and close contact with the frozen soil mass and each soil layer, and the displacement and stress continuity conditions are satisfied at the contact surfaces of each medium.

[0183] On the inner boundary of the lining (r = R1), the external load q0e iωt is equal to the radial stress of the lining, that is:

[0184]

[0185] On the contact surface between the lining and the frozen soil (r = R2), the radial stress and radial displacement of the lining and the soil mass in the plastic frozen soil region are the same, that is:

[0186]

[0187] On the contact surface between the plastic frozen soil region and the elastic frozen soil region (r = R3), the radial displacements of the soil mass in the plastic frozen soil region and the elastic frozen soil region are the same, that is:

[0188]

[0189] On the contact surface between the elastic frozen soil region and the elastic non-frozen soil region (r = R4), the radial displacements and radial stresses of the soil mass in the elastic frozen soil region and the elastic non-frozen soil region are the same, that is:

[0190]

[0191] Through the above boundary conditions, the undetermined coefficients A1 to A5 and B1 can be obtained. Then, by substituting the undetermined coefficients back into the relevant equations, the Figure 1 specific solutions of the steady-state responses in different regions can be obtained.

[0192] In one embodiment, generating a visualization evaluation model based on the first evaluation result includes:

[0193] S201. Perform content mapping between the first evaluation result and the content mapping atlas, and determine multiple content trees and the respective tree relationships and tree weights of each content tree from the content mapping atlas; wherein, the content tree includes: a tree structure in which all the tree nodes attached in the content mapping atlas are mapped with sub-contents in the first evaluation result; the tree relationship includes: the association relationship between the content tree and other content trees; the tree weight includes: the weight value of the content tree in the weight value table corresponding to the union of all content trees;

[0194] In step S201, a content mapping atlas is preset. There are multiple tree structures in the content mapping atlas, and multiple tree nodes are attached to the tree structures. Each tree structure represents a situation that requires tunnel stability evaluation. The tree nodes attached to the tree structure form a mapping relationship with the constituent element content of this situation. When performing content mapping between the first evaluation result and the content mapping atlas, each tree node searches for the corresponding construction element content in the first evaluation result based on the mapping relationship. When found, it is used as the mapped sub-content. Therefore, when all the tree nodes attached to the tree structure are mapped with sub-content in the first evaluation result, it indicates that there is a situation that requires tunnel stability evaluation represented by the tree structure, that is, when the content tree is determined, this situation exists. Specifically, for example, if the situation that requires tunnel stability evaluation represented by the tree structure is to analyze the error of the first evaluation result, then the constituent element content of this situation that forms a mapping relationship with the tree nodes attached to the tree structure are respectively the evaluation process of the first evaluation, the evaluation result record of the tunnel stability evaluation in history, etc. The association relationship between the content tree and other content trees can be that the situations they represent are the same (such as both being evaluation error analysis), or there is a causal relationship between the situations they represent (such as one being error analysis and the other being error impact analysis), etc. All content trees jointly correspond to a weight value table. There are the weight values of all content trees in the weight value table, and the sum of the weight values of all content trees is 1. The weight value of the content tree represents the importance degree of the situation that requires tunnel stability evaluation represented by each content tree when the situations represented by all content trees occur. The larger the weight value, the greater the importance degree.

[0195] S202. Based on the tree setting rules, each content tree is set on the time line. Among them, the tree setting rules include: arranging each content tree on the time line in descending order of tree weight. The content tree with the largest tree weight is set at the head of the time line. When there is the same tree relationship between two adjacent content trees, the interval between the two adjacent content trees on the time line is the first standard interval value. Otherwise, the interval between the two adjacent content trees on the time line is the second standard interval value of the difference in tree weights of the two adjacent content trees in the interval value table. The length of the spanning interval of each content tree on the time line is the standard length value.

[0196] In step S202, there are multiple moments on the timeline; the greater the tree weight, the higher the importance of the situation represented by the corresponding content tree that requires tunnel stability evaluation, and it is set earlier on the timeline; the content tree with the largest tree weight is set at the beginning of the timeline, that is, the earliest moment on the timeline; when there is the same tree relationship between two adjacent content trees, it means that expert personnel need to pay attention to the situations represented by these two content trees that require tunnel stability evaluation together, and set an interval of the same first standard interval value. When the length of the cross-involved interval is the same standard length value, expert personnel can first pay attention to the situation represented by the content tree set earlier that requires tunnel stability evaluation, and in the later stage, they can pay attention to the situations represented by both content trees that require tunnel stability evaluation together; the interval between two adjacent content trees on the timeline is the absolute value of the difference between the moments at which they are set on the timeline; the first standard interval value can be 100 seconds; the cross-involved interval is a time interval starting from the moment when the content tree is set, and the standard length value can be 300 seconds; when there is no same tree relationship between two adjacent content trees, query the interval value table to determine the second standard interval value corresponding to the tree weight difference between the two adjacent content trees. The second standard interval value has a positive correlation with the tree weight difference. The tree weight difference between two adjacent content trees is the absolute value of the difference between the respective tree weights of the adjacent content trees. The larger it is, the more important the situation represented by the former content tree that requires tunnel stability evaluation is than the latter, and the larger the second standard interval value is, so that expert personnel pay attention to the situation represented by the content tree set earlier that requires tunnel stability evaluation for a longer time;

[0197] S203. Based on the visualization rules, according to the timeline after all content trees are set, perform visualization configuration on the basic model; among them, the visualization rules include: the virtual pointer starts to move from the starting point of the timeline after all content trees are set. When it moves to the cross-involved interval, control the basic model to visualize the sub-content of all tree nodes attached to the content tree of the moved cross-involved interval in the first evaluation result;

[0198] In step S203, the virtual pointer moves at the normal time elapse speed; the basic model is a digital three-dimensional model. When visualizing the sub-content, the sub-content is arranged according to the type of the sub-content, and the specific arrangement rules can be set in advance by technical personnel;

[0199] S204. Use the basic model after the visualization configuration is completed as the visualization evaluation model.

[0200] When generating a visual evaluation model based on the first evaluation result in an embodiment of the present invention, content mapping is performed between the first evaluation result and the content mapping atlas, and multiple content trees and the tree relationships and tree weights of each content tree are determined from the content mapping atlas. Based on the content trees and the tree relationships and tree weights of each content tree, tree setting rules are determined specifically. Based on the visualization rules, according to the timeline after each content tree is set, the basic model is visually configured, and finally the basic model after the visual configuration is completed is used as the visual evaluation model, so that the visual evaluation model can dynamically and specifically display the sub - contents for the user to conduct a second evaluation of the tunnel stability in sequence with high precision, greatly improving the comprehensiveness, precision and applicability of the generation of the visual evaluation model, thus enhancing its ability to assist users and improving the evaluation efficiency of users.

[0201] In one embodiment, guiding and interactively assisting the user to conduct a second evaluation of the tunnel stability based on the visual evaluation model includes:

[0202] S301. Give guiding prompts to the user;

[0203] In step S301, when giving guiding prompts to the user, guiding prompt information can be displayed to the user, for example: "Guiding you soon, please confirm".

[0204] S302. When the user confirms the guidance, display the visual evaluation model to the user;

[0205] In step S302, when the user confirms the guidance, display the visual evaluation model to the user;

[0206] S303. Extract features from the interaction information generated by the user's interaction with the visual evaluation model within the target time interval to obtain multiple interaction features;

[0207] In step S303, the interaction between the user and the visual evaluation model refers to the user's operations on the visual evaluation model and the display and feedback content of the visual evaluation model, etc. Correspondingly, the interaction information is the operation type, operation time, etc. of the user's operations and the display and feedback content type and time of the visual evaluation model, etc.; when extracting features from the interaction information, the multiple interaction features extracted are the information features of this type of information.

[0208] S304. Match each interaction feature with multiple standard interaction features respectively;

[0209] S305. Determine the target auxiliary knowledge from the auxiliary knowledge base; the target auxiliary knowledge in the auxiliary knowledge base is indicated by the most standard interaction features that match at least one interaction feature.

[0210] In step S305, the standard interaction feature is an interaction feature that can indicate what kind of auxiliary knowledge is used to assist in the interaction between the user and the visualization evaluation model. For example, if the standard interaction feature is to view the stability analysis result of a certain structural area of the tunnel for more than 3 minutes, the indicated auxiliary knowledge is the auxiliary knowledge of displaying the historical stability analysis results of the result area for the user to conduct historical comparative analysis. Each time the standard interaction feature matches the interaction feature, the auxiliary knowledge that matches the standard interaction feature will be indicated once. Thus, the auxiliary knowledge most indicated by each standard interaction feature that matches at least one interaction feature in the auxiliary knowledge base is used as the target auxiliary knowledge.

[0211] S306. Analyze the target auxiliary knowledge to obtain multiple auxiliary rules and the respective rule priorities of each auxiliary rule.

[0212] In step S306, the target auxiliary knowledge includes multiple auxiliary rules and the respective rule priorities of each auxiliary rule. The auxiliary rule is a rule that the target auxiliary knowledge needs to execute to assist in the interaction between the user and the visualization evaluation model. The corresponding rule priority is the degree of priority of the auxiliary rule when the target auxiliary knowledge is used to assist in the interaction between the user and the visualization evaluation model.

[0213] S307. Execute each auxiliary rule in descending order of rule priority to assist in the future interaction between the user and the visualization evaluation model. Among them, each time an auxiliary rule is executed, when the user confirms the executed auxiliary rule, then execute the next auxiliary rule.

[0214] Execute each auxiliary rule in descending order of rule priority to achieve assistance in the future interaction between the user and the visualization evaluation model.

[0215] Among them, the start time of the target time interval is the time when the virtual pointer moves to a new spanning interval each time after passing through N spanning intervals, and the end time of the target time interval is the time when the virtual pointer moves to the end point of the new spanning interval where it moves this time, and then the user performs the last active operation on the visualization evaluation model before the end; N is a positive integer; N is preset and can be, for example, 3; the start time of the target time interval is the time when the virtual pointer moves to a new spanning interval each time after passing through N spanning intervals, which can be such that when the user views the displayed visualization evaluation model in the previous period of time, no assistance is provided to the user, and only after the user finishes viewing in the previous period of time and has an understanding of the situation to be evaluated will the user determine whether to provide assistance to it; the active operation refers to the operation of the user actively operating the visualization evaluation model, such as: controlling the visualization evaluation model to stop the visualization display, etc.; the end time of the target time interval is set to the time when the virtual pointer moves to the end point of the new spanning interval where it moves this time, and then the user performs the last active operation on the visualization evaluation model before the end; thus, it is appropriate to determine whether to assist the user within the target time interval; the start time and the end time of the target time interval belong to the same new spanning interval;

[0216] Or,

[0217] The start time of the target time interval is the time when the user starts a passive operation on the visualization evaluation model for the first time, and the end time of the target time interval is the time when the user ends the passive operation on the visualization evaluation model for this time. In addition, the start time of the target time interval is also the time when the user starts a passive operation on the visualization evaluation model for the first time, and the end time of the target time interval is the time when the user ends the passive operation on the visualization evaluation model for this time; the passive operation refers to the user adjusting the visualization progress of the visualization evaluation model due to the mismatch between the visualization progress of the visualization evaluation model and the user's evaluation rhythm, etc.; when the user performs a passive operation, the probability that the subsequent interaction information generated by the user reflects its assistance requirement is relatively high. Therefore, it is appropriate to determine whether to assist the user within the target time interval.

[0218] When the embodiment of the present invention guides and interactively assists the user to perform a second evaluation on the stability of the tunnel based on the visualization evaluation model, the interaction feature and the standard interaction feature are introduced, and based on the matching situation between the two, the target assistance knowledge that can be used to assist the user is quickly and accurately determined from the assistance knowledge base, the target assistance knowledge is parsed, and each assistance rule is executed in order from the largest to the smallest according to the rule priority to assist the user in the future interaction with the visualization evaluation model, which greatly improves the assistance efficiency; secondly, the target time interval is introduced to accurately determine the timing of identifying whether the user needs assistance, reducing the assistance resources and further improving the assistance efficiency.

[0219] In one embodiment, the outputting of the second evaluation result includes:

[0220] Displaying the second evaluation result to the requester of the evaluation result. The requester of the evaluation result can be tunnel site workers, etc.

[0221] An embodiment of the present invention provides a tunnel stability evaluation system based on elastoplastic analysis of cold region soil mass, as Figure 3 shown, including:

[0222] A first evaluation module 1, configured to perform a first evaluation on the stability of the tunnel based on elastoplastic analysis of cold region soil mass, and obtain a first evaluation result;

[0223] A generation module 2, configured to generate a visual evaluation model based on the first evaluation result;

[0224] A second evaluation module 3, configured to guide and interactively assist the user to perform a second evaluation on the stability of the tunnel based on the visual evaluation model, and obtain a second evaluation result;

[0225] An output module 4, configured to output the second evaluation result.

[0226] The first evaluation module performs a first evaluation on the stability of the tunnel based on elastoplastic analysis of cold region soil mass, including:

[0227] Performing a first evaluation on the stability of the tunnel based on an elastoplastic simplified dynamic model of non-uniformly frost-heaved soil mass around the cold region tunnel.

[0228] The generation module generates a visual evaluation model based on the first evaluation result, including:

[0229] Performing content mapping between the first evaluation result and a content mapping atlas, and determining multiple content trees and the tree relationships and tree weights of each content tree from the content mapping atlas; wherein, the content tree includes: a tree structure in which all tree nodes attached in the content mapping atlas are mapped with sub-contents in the first evaluation result; the tree relationship includes: the association relationship between the content tree and other content trees; the tree weight includes: the weight value of the content tree in the weight value table corresponding to the union of all content trees;

[0230] Setting each content tree on the time line based on tree setting rules; wherein, the tree setting rules include: setting each content tree on the time line in descending order of tree weight, with the content tree having the largest tree weight set at the head of the time line. When there is the same tree relationship between two adjacent content trees, the interval between the corresponding two adjacent content trees on the time line is a first standard interval value; otherwise, the interval between the corresponding two adjacent content trees on the time line is a second standard interval value of the difference between the tree weights of the corresponding two adjacent content trees in the interval value table; the length of the spanning interval of each content tree on the time line is a standard length value;

[0231] Based on the visualization rules, according to the timeline after the completion of the setting of each content tree, the basic model is visually configured; wherein, the visualization rules include: the virtual pointer moves from the starting point of the timeline after the completion of the setting of each content tree, and when it moves to the spanning interval, it controls the basic model to visually display the sub - content of all the tree nodes attached to the content tree of the moved - to spanning interval in the first evaluation result.

[0232] The basic model after the completion of the visual configuration is used as the visual evaluation model.

[0233] The second evaluation module guides and interactively assists the user to conduct a second evaluation on the stability of the tunnel based on the visual evaluation model, including:

[0234] Guiding and prompting the user;

[0235] When the user confirms the guidance, the visual evaluation model is displayed to the user;

[0236] Feature extraction is performed on the interaction information generated by the user's interaction with the visual evaluation model within the target time interval to obtain multiple interaction features;

[0237] Each of the interaction features is respectively matched with multiple standard interaction features;

[0238] Determine the target auxiliary knowledge from the auxiliary knowledge base; the target auxiliary knowledge in the auxiliary knowledge base is most indicated by the standard interaction features that match at least one of the interaction features.

[0239] Parse the target auxiliary knowledge to obtain multiple auxiliary rules and the rule priorities of each auxiliary rule;

[0240] The auxiliary rules are executed in descending order of rule priority to assist the user's future interaction with the visual evaluation model; wherein, when executing each auxiliary rule, when the user confirms the executed auxiliary rule, the next auxiliary rule is executed;

[0241] Wherein, the starting moment of the target time interval is the moment when the virtual pointer moves to a new spanning interval after passing through N spanning intervals, and the ending moment of the target time interval is the moment when the user's last active operation on the visual evaluation model ends before the end point of the newly moved - to spanning interval; N is a positive integer;

[0242] Or,

[0243] The start time of the target time interval is the time when the user starts the passive operation visualization evaluation model for the first time, and the end time of the target time interval is the time when the user ends the passive operation visualization evaluation model for this time.

[0244] The output module outputs a second evaluation result, including:

[0245] Display the second evaluation result to the evaluation result requester.

[0246] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A tunnel stability evaluation method based on elastic-plastic analysis of cold-region soil, characterized in that: include: Based on the elastic-plastic analysis of cold-region soil, the stability of the tunnel is evaluated first and the first evaluation results are obtained; Based on the first evaluation result, generating a visual evaluation model; Guide and interactively assist users to conduct a second evaluation of the stability of the tunnel based on a visual evaluation model and obtain a second evaluation result; outputting a second evaluation result; The generating of a visual evaluation model based on the first evaluation result includes: Content mapping is performed between the first evaluation result and the content mapping map, and a plurality of content trees and respective tree relationships and tree weights of the content trees are determined from the content mapping map; wherein the content tree includes: a tree structure in which all tree nodes attached to the content mapping map are mapped with sub-contents in the first evaluation result; the tree relationship includes: an association relationship between a content tree and other content trees; and the tree weight includes: a weight value of a content tree in a weight value table corresponding to a combination of all content trees; Based on the tree setting rule, each content tree is set on the timeline; wherein the tree setting rule includes: each content tree is set on the timeline in descending order according to the tree weight, and the content tree with the largest tree weight is set at the first position of the timeline; when two adjacent content trees have the same tree relationship, the interval between the two adjacent content trees on the timeline is the first standard interval value; otherwise, the interval between the two adjacent content trees on the timeline is the second standard interval value of the tree weight difference between the two adjacent content trees in the interval value table; the length of the span interval of each content tree on the timeline is the standard length value; Based on the visualization rules, the basic model is visualized and configured according to the timeline after each content tree is set; wherein the visualization rules include: the virtual pointer starts to move from the starting point of the timeline after each content tree is set, and when it moves to the cross-interval, the basic model is controlled to visualize the sub-contents in the first evaluation result of all tree nodes attached to the content tree in the cross-interval moved to; The basic model after the visualization configuration is completed is used as the visualization evaluation model.

2. The tunnel stability evaluation method based on elastoplastic analysis of cold region soil as claimed in claim 1 is characterized in that: The first evaluation of tunnel stability based on the elastic-plastic analysis of cold-region soil includes: Based on the simplified elastoplastic dynamic model of the non-uniform frost-heaving soil around the tunnel in cold regions, the first evaluation of the tunnel stability is carried out.

3. The tunnel stability evaluation method based on elastic-plastic analysis of cold-region soil as claimed in claim 2 is characterized in that: The guiding and interactively assisting the user to perform a second evaluation on the stability of the tunnel based on the visual evaluation model includes: Provide guidance and prompts to users; When the user confirms the guidance, a visual evaluation model is displayed to the user; Extract features of the interactive information generated by the user's interaction with the visual evaluation model within the target time interval to obtain multiple interactive features; Matching each interaction feature with a plurality of standard interaction features respectively; Determining target auxiliary knowledge from an auxiliary knowledge base; the target auxiliary knowledge is indicated most by each standard interaction feature that matches at least one interaction feature in the auxiliary knowledge base; Analyze the target auxiliary knowledge to obtain multiple auxiliary rules and the priority of each auxiliary rule; Execute each auxiliary rule in order from the highest priority to the lowest priority to assist the user in interacting with the visual evaluation model in the future; each time an auxiliary rule is executed, when the user confirms the auxiliary rule executed this time, the next auxiliary rule is executed; The starting time of the target time interval is the time when the virtual pointer moves to a new cross-interval after passing through N cross-intervals, and the ending time of the target time interval is the time when the user's last active operation of the visualization evaluation model ends before the virtual pointer moves to the end point of the new cross-interval; N is a positive integer; or, The starting time of the target time interval is the time when the user starts to perform a passive operation visualization evaluation model, and the ending time of the target time interval is the time when the user ends the passive operation visualization evaluation model.

4. The tunnel stability evaluation method based on elastoplastic analysis of cold region soil as claimed in claim 1, characterized in that: The outputting of the second evaluation result comprises: The second evaluation result is displayed to the evaluation result requester.

5. A tunnel stability evaluation system based on elastic-plastic analysis of cold-region soil, characterized in that: include: A first evaluation module is used to perform a first evaluation on the stability of the tunnel based on the elastic-plastic analysis of the cold region soil and obtain a first evaluation result; A generating module, used for generating a visual evaluation model based on the first evaluation result; A second evaluation module is used to guide and interactively assist the user to conduct a second evaluation on the stability of the tunnel based on the visual evaluation model and obtain a second evaluation result; An output module, used for outputting the second evaluation result; The generating module generates a visual evaluation model based on the first evaluation result, including: Content mapping is performed between the first evaluation result and the content mapping map, and a plurality of content trees and respective tree relationships and tree weights of the content trees are determined from the content mapping map; wherein the content tree includes: a tree structure in which all tree nodes attached to the content mapping map are mapped with sub-contents in the first evaluation result; the tree relationship includes: an association relationship between a content tree and other content trees; and the tree weight includes: a weight value of a content tree in a weight value table corresponding to a combination of all content trees; Based on the tree setting rule, each content tree is set on the timeline; wherein the tree setting rule includes: each content tree is set on the timeline in descending order according to the tree weight, and the content tree with the largest tree weight is set at the first position of the timeline; when two adjacent content trees have the same tree relationship, the interval between the two adjacent content trees on the timeline is the first standard interval value; otherwise, the interval between the two adjacent content trees on the timeline is the second standard interval value of the tree weight difference between the two adjacent content trees in the interval value table; the length of the span interval of each content tree on the timeline is the standard length value; Based on the visualization rules, the basic model is visualized and configured according to the timeline after each content tree is set; wherein the visualization rules include: the virtual pointer starts to move from the starting point of the timeline after each content tree is set, and when it moves to the cross-interval, the basic model is controlled to visualize the sub-contents in the first evaluation result of all tree nodes attached to the content tree in the cross-interval moved to; The basic model after the visualization configuration is completed is used as the visualization evaluation model.

6. The tunnel stability evaluation system based on elastoplastic analysis of cold region soil as claimed in claim 5, characterized in that: The first evaluation module performs a first evaluation on the stability of the tunnel based on the elastic-plastic analysis of cold-region soil, including: Based on the simplified elastoplastic dynamic model of the non-uniform frost-heaving soil around the tunnel in cold regions, the first evaluation of the tunnel stability is carried out.

7. The tunnel stability evaluation system based on cold region soil elastoplastic analysis according to claim 5 is characterized in that: The second evaluation module guides and interactively assists the user to perform a second evaluation on the stability of the tunnel based on the visual evaluation model, including: Provide guidance and prompts to users; When the user confirms the guidance, a visual evaluation model is displayed to the user; Extract features of the interactive information generated by the user's interaction with the visual evaluation model within the target time interval to obtain multiple interactive features; Matching each interaction feature with a plurality of standard interaction features respectively; Determining target auxiliary knowledge from an auxiliary knowledge base; the target auxiliary knowledge is indicated most by each standard interaction feature that matches at least one interaction feature in the auxiliary knowledge base; Analyze the target auxiliary knowledge to obtain multiple auxiliary rules and the priority of each auxiliary rule; Execute each auxiliary rule in order from the highest priority to the lowest priority to assist the user in interacting with the visual evaluation model in the future; each time an auxiliary rule is executed, when the user confirms the auxiliary rule executed this time, the next auxiliary rule is executed; The starting time of the target time interval is the time when the virtual pointer moves to a new cross-interval after passing through N cross-intervals, and the ending time of the target time interval is the time when the user's last active operation of the visualization evaluation model ends before the virtual pointer moves to the end point of the new cross-interval; N is a positive integer; or, The starting time of the target time interval is the time when the user starts to perform a passive operation visualization evaluation model, and the ending time of the target time interval is the time when the user ends the passive operation visualization evaluation model.

8. The tunnel stability evaluation system based on cold region soil elastoplastic analysis according to claim 5, characterized in that: The output module outputs the second evaluation result, including: The second evaluation result is displayed to the evaluation result requester.

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