Reservoir area landslide accumulation body mechanical property analysis method and system based on dry-wet cycle

Abstract

The invention relates to the technical field of environmental engineering, and discloses a reservoir area landslide accumulation body mechanical property analysis method and system based on dry-wet cycling, and the method comprises the steps: carrying out the simulation of the dry-wet cycling effect on a reservoir area landslide accumulation body; measuring the strength and deformation characteristics of the slide band soil with different water saturations; and analyzing macromechanical response and structural evolution characteristics of the slip band, and revealing a degradation mechanism of reservoir area water action on the strength of the slip band. According to the method, comprehensive research on the dynamic characteristics and the action mechanism of the landslide soil body in the reservoir area is achieved, a scientific basis is provided for landslide instability risk assessment through fine water level regulation and control, mechanical monitoring, pore structure analysis, macroscopic response assessment and decision support, and effective prevention and treatment work is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of environmental engineering, and in particular to a method and system for analyzing mechanical characteristics of a landslide accumulation body in a reservoir area based on dry-wet cycles. Background Art

[0002] The rise and fall of water level in the reservoir area causes the slope of the reservoir bank to be in a periodic dry-wet cycle state, and the mechanical properties of the rock and soil change. Under the superposition of external load environments such as rainfall infiltration and earthquakes, a large number of slope instability and landslides will be induced. The periodic fluctuation of the reservoir water level causes the rock and soil to undergo a dehydration-saturation process, which not only causes changes in mechanical properties, but also causes changes in composition and physical structure. During the operation of the reservoir, the reservoir water level changes periodically by 30m (145-175m). Long-term low-water level drainage and high-water level immersion cause changes in the moisture content of the sliding zone soil of the bank landslide. The research on hydrodynamic characteristics mechanical tests focuses on the softening law of the strength characteristics of the sliding zone soil under different moisture contents or saturation, and rarely considers the evolution characteristics of the unsaturated mechanical properties of the sliding zone soil during repeated dry-wet cycles.

[0003] Through indoor water-saturated softening tests, we can study the strength and deformation characteristics of sliding zone soils with different water saturations, explore the evolution of cohesion and internal friction angle with water saturation, and derive the law of strength parameter changes. At the same time, the correlation between crack expansion and matrix suction and strength evolution of sliding zone soil under dry-wet cycles is also directly related to the deformation response and stability of the slope. The macroscopic mechanical properties of rock and soil are the concentrated embodiment of microstructural changes, and the microstructural evolution characteristics are the inherent mechanism of its macroscopic mechanical behavior.

[0004] The changes in the macroscopic physical and mechanical properties of rock and soil caused by the dry-wet cycle are the result of the initiation, expansion, nucleation and penetration of internal microcracks. The study of macroscopic and microscopic characteristics belongs to the cross-scale category. Based on the current observation technology and characteristics of the microscopic structure of rock and soil, the mercury injection method and nitrogen adsorption method can be used to measure the pore structure and size evolution law of rock and soil during the dry-wet cycle process; the scanning electron microscope (SEM) test is used to study the dry-wet cycle effect of rock and soil, clarify the morphology, structural complexity and arrangement order of rock and soil particles, and provide useful help for the study of unsaturated permeability. It has significant testing characteristics such as fast, accurate and non-destructive. Summary of the invention

[0005] In view of the above existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a mechanical property analysis method for reservoir landslide accumulation based on dry-wet cycles, and conducts an in-depth analysis of the changes in the mechanical properties of rock and soil and the landslide risks caused by the reservoir landslide accumulation under dry-wet cycle conditions. By studying the influence of different water saturations on the strength parameters of sliding belt soil, the potential factors of landslide instability are identified, the stability of the reservoir slope is evaluated, and the interaction mechanism between macroscopic mechanical properties (such as strength and deformation) and microstructure (such as porosity and pore size) is clarified, narrowing the research gap between the two.

[0007] To solve the above technical problems, the present invention provides the following technical solutions, a method for analyzing the mechanical properties of landslide deposits in reservoir areas based on dry-wet cycles, comprising: simulating the dry-wet cycle effects on landslide deposits in reservoir areas; measuring the strength and deformation characteristics of sliding zone soil under different water saturations; analyzing the macroscopic mechanical response and structural evolution characteristics of the sliding zone, and revealing the degradation mechanism of the strength of the sliding zone caused by the action of water in the reservoir area.

[0008] As a preferred solution of the mechanical property analysis method of the landslide accumulation body in the reservoir area based on the dry-wet cycle of the present invention, the simulation of the dry-wet cycle includes using a water level regulating valve, setting a water tank, maintaining a certain connection with the landslide accumulation body in the reservoir area, installing a water level sensor, monitoring the water level change of the landslide accumulation body in real time, and feeding back the data to the control system;

[0009] Set the timer in the control system to ensure that each water level maintenance stage switches automatically to form a complete cycle. Use a data recorder to record the exact start and end time of each stage. Use a water level sensor to feed real-time data back to the control system to automatically adjust the opening and closing of pumps and valves. The implementation of different water level stages is controlled by the program. After each cycle, the system automatically generates a report showing the water / soil ratio and reaction conditions of the corresponding soil body, providing data support for subsequent analysis.

[0010] As a preferred solution of the mechanical property analysis method of the landslide accumulation body in the reservoir area based on the dry-wet cycle described in the present invention, wherein: the real-time monitoring of the water level change of the landslide accumulation body includes setting the parameters of the periodic water level change, the high water level, the low water level, the lifting and lowering rate and the maintenance time in the control system, determining the periodicity of the dry-wet cycle, and the cycle time will include the stages of water level rising, maintaining, lowering and maintaining again;

[0011] At the high water level stage, the pump system is turned on to inject water into the landslide accumulation body, so that the water level quickly rises to the set high water level and is maintained for a period of time to observe the saturation response of the soil;

[0012] After the high water level is maintained, turn off the pump and open the drain valve to gradually lower the water level to the set low water level. The reduction rate should be steady to avoid causing instantaneous instability of the soil. In the low water level stage, maintain a dry state for a period of time to allow the soil to experience a water loss process. Subsequently, repeat the above-mentioned rising and falling process to form a dry-wet cycle.

[0013] As a preferred solution of the mechanical property analysis method of reservoir landslide accumulation body based on dry-wet cycle described in the present invention, wherein: the determination of the strength and deformation characteristics of sliding zone soil under different water saturations includes analyzing the influence of different water saturations on the strength parameters of sliding zone soil, deducing based on the data obtained in the simulation process of dry-wet cycle, determining the pore structure of sliding zone soil sample, and analyzing the pore characteristics and evolution law under dry-wet cycle conditions;

[0014] Analysis of cohesion c at different saturations s and internal friction angle φ s By fitting the experimental data through linear regression, the following relationship is obtained:

[0015] c s =c0+k c (S-S0)

[0016] φ s =φ0+k φ (S-S0)

[0017] Among them, S is water saturation, S0 is base saturation, k c and k φ is a sensitivity parameter related to saturation, c0 is the cohesion at the initial moisture stage, and φ0 is the friction angle at the initial moisture state;

[0018] Through the strain gauges and pressure sensors on the sliding belt soil samples, at the beginning of each dry-wet cycle stage, the system automatically records the initial stress and strain state as the baseline data. When applying stress, the sensor feedback data is monitored in real time, and the applied stress value and strain change are recorded. At the end of each dry-wet cycle stage, the system automatically saves the strength and deformation data of the current stage and records the timestamp;

[0019] After each cycle, the recorded data is reviewed periodically to identify changes in the relationship between stress, strain and time. Based on the changes in each cycle, a report is generated to analyze the mechanical response of the soil sample, including the evolution of strength and deformation characteristics over time.

[0020] As a preferred solution of the mechanical property analysis method of the reservoir landslide accumulation body based on dry-wet cycle described in the present invention, wherein: the pore structure of the sliding zone soil sample is determined by using an improved gas adsorption method, taking into account the influence of temperature and humidity, obtaining porosity and average pore size data at different dry-wet cycle stages, and integrating them to form a database;

[0021] The pore pressure changes are modeled using the following relationship:

[0022] ΔP=α n (S-S0)+β d (dd ref )

[0023] Where ΔP is the change in pore pressure, α n is the parameter of soil response intensity to saturation change, β d is the sensitivity coefficient of the average pore size change on the pore pressure, d is the average pore size at the current moment, and d ref is the base aperture.

[0024] As a preferred solution of the mechanical property analysis method of the reservoir landslide accumulation body based on dry-wet cycle described in the present invention, wherein: the analysis of the macroscopic mechanical response and structural evolution characteristics of the sliding zone includes that with the increase of water saturation, the cohesion and internal friction angle of the sliding zone soil gradually decrease, which is specifically manifested as strong cohesion and soil stability at low saturation of 35%. As the water saturation increases to more than 75%, the cohesion and internal friction angle decrease, and the landslide risk increases;

[0025] In the initial stage, the high water level causes a rapid decrease in soil strength, but in the stable period after the soil is fully saturated, the mechanical properties temporarily recover. Repeated dry-wet cycles cause the soil structure to gradually soften, and the strength and deformation properties show a trend of gradual deterioration.

[0026] After the dry-wet cycle, the porosity of the soil increases and the pore structure becomes complex, which leads to an increase in the permeability of the soil, a more serious loose state, a change in the average value of the pore size, and the appearance of microcracks and pore expansion.

[0027] Combined with the reduction in strength parameters and changes in pore structure, it is deduced that the stability of the landslide deposit decreases under repeated dry-wet cycles: the hydraulic effect and soil strength reduction caused by periodic changes in water levels increase the probability of landslides. Under the influence of rainfall and water level fluctuations, the landslide body will undergo a transition from relative stability to critical instability.

[0028] As a preferred solution of the mechanical property analysis method of reservoir landslide accumulation body based on dry-wet cycle described in the present invention, the degradation mechanism includes: combining macroscopic mechanical data with microstructural changes, constructing a degradation model of sliding belt soil, calculating an overall analysis framework, defining data sources, integrating macroscopic and microscopic analysis results, and forming auxiliary decision-making suggestions through the results of the analysis, which are fed back into the landslide management and prevention work to provide a scientific basis.

[0029] As a preferred solution of the mechanical property analysis system of the reservoir landslide accumulation body based on dry-wet cycle described in the present invention, it includes: a water level control module, a mechanical property monitoring module, a pore structure analysis module, a macroscopic mechanical response analysis module, and a decision support module;

[0030] The water level control module is responsible for regulating the water level of the landslide accumulation body in the reservoir area through the water level regulating valve and pump system to simulate the dry-wet cycle;

[0031] The mechanical property monitoring module continuously monitors the strength and deformation characteristics of sliding zone soil at different water saturations through strain gauges and pressure sensors. It automatically records the initial stress and strain state and monitors the feedback data in real time while applying stress in each dry-wet cycle stage.

[0032] The pore structure analysis module uses an improved gas adsorption method to measure the porosity and average pore size of sliding zone soil samples, analyzes the changes in pore structure at different dry-wet cycle stages, and integrates relevant data into a database to support further mechanical property analysis;

[0033] The macro-mechanical response analysis module comprehensively analyzes the macro-mechanical response and structural evolution characteristics of the sliding zone soil, including the analysis of the change of strength parameters and the assessment of landslide risks at different saturations;

[0034] The decision support module constructs a degradation model of the landslide accumulation body based on the analysis results obtained from other modules, and provides scientific basis and management suggestions for decision makers.

[0035] A computer device includes a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of a method for analyzing the mechanical characteristics of a reservoir landslide accumulation body based on dry-wet cycles are implemented.

[0036] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of a method for analyzing the mechanical characteristics of a reservoir landslide accumulation body based on dry-wet cycles are implemented.

[0037] Beneficial effects of the present invention: by accurately evaluating the landslide instability mechanism, a scientific basis is provided for the design and improvement of protective structures, the probability of landslide accidents is reduced, and public safety is improved. The research results can help decision makers formulate more effective reservoir operation and management plans, thereby effectively controlling water level fluctuations in the reservoir area and reducing damage to landslide bodies. It provides new research directions and theoretical support for the fields of geotechnical engineering, geological disaster prevention and control, and promotes theoretical research and application of the mechanical properties of unsaturated soil. By establishing a corresponding monitoring system, the mechanical response of the landslide deposit is collected and analyzed in real time, which will lay the foundation for the application of digital management and intelligent monitoring technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0039] Figure 1 A schematic flow chart of a method for analyzing mechanical properties of landslide deposits in a reservoir area based on dry-wet cycles provided in accordance with an embodiment of the present invention.

[0040] Figure 2 A dry-wet cycle test scheme for a reservoir area landslide accumulation body mechanical property analysis method based on dry-wet cycles is provided as an embodiment of the present invention.

[0041] Figure 3 A schematic diagram of the working modules of a system for analyzing mechanical properties of landslide deposits in a reservoir area based on dry-wet cycles provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0044] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0045] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0046] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a method for analyzing mechanical properties of landslide accumulation in a reservoir area based on dry-wet cycles, including:

[0049] S1: Simulation of the dry-wet cycle of landslide deposits in the reservoir area.

[0050] Furthermore, a water level regulating valve is used to set up a water tank, maintain a certain connection with the landslide accumulation body in the reservoir area, and a water level sensor is installed to monitor the water level changes of the landslide accumulation body in real time, and feed the data back to the control system;

[0051] Set the timer in the control system to ensure that each water level maintenance stage switches automatically to form a complete cycle. Use a data recorder to record the exact start and end time of each stage. Use a water level sensor to feed real-time data back to the control system to automatically adjust the opening and closing of pumps and valves. The implementation of different water level stages is controlled by the program. After each cycle, the system automatically generates a report showing the water / soil ratio and reaction conditions of the corresponding soil body, providing data support for subsequent analysis.

[0052] It should be noted that the parameters of periodic water level changes, high water level, low water level, lifting and lowering rate and maintenance time are set in the control system to determine the periodicity of the dry-wet cycle. The cycle time will include the stages of water level rising, maintaining, lowering and maintaining again;

[0053] At the high water level stage, the pump system is turned on to inject water into the landslide accumulation body, so that the water level quickly rises to the set high water level and is maintained for a period of time to observe the saturation response of the soil;

[0054] After the high water level is maintained, turn off the pump and open the drain valve to gradually lower the water level to the set low water level. The reduction rate should be steady to avoid causing instantaneous instability of the soil. In the low water level stage, maintain a dry state for a period of time to allow the soil to experience a water loss process. Subsequently, repeat the above-mentioned rising and falling process to form a dry-wet cycle.

[0055] S2: Determine the strength and deformation characteristics of sliding zone soils at different water saturations.

[0056] Furthermore, the influence of different water saturations on the strength parameters of sliding zone soils was analyzed, the pore structure of sliding zone soil samples was determined based on the data obtained during the simulation of dry-wet cycles, and the pore characteristics and evolution laws under dry-wet cycle conditions were analyzed;

[0057] Analysis of cohesion c at different saturations s and internal friction angle φ s By fitting the experimental data through linear regression, the following relationship is obtained:

[0058] c s =c0+k c (S-S0)

[0059] φ s =φ0+k φ (S-S0)

[0060] Among them, S is water saturation, S0 is base saturation, k c and k φ is a sensitivity parameter related to saturation, c0 is the cohesion at the initial moisture stage, and φ0 is the friction angle at the initial moisture state;

[0061] Through the strain gauges and pressure sensors on the sliding belt soil samples, the system automatically records the initial stress and strain state at the beginning of each dry-wet cycle stage, and records the applied stress σ and deformation ∈ at the end of each stage, and adopts the improved constitutive model:

[0062]

[0063] Among them, E is the elastic modulus, C is the parameter associated with the change of pore structure, e is the boundary strain of soil, and τ is the exponential coefficient with saturation.

[0064] As the benchmark data, when stress is applied, the sensor feedback data is monitored in real time, and the applied stress value and strain change are recorded. At the end of each dry-wet cycle stage, the system automatically saves the strength and deformation data of the current stage and records the timestamp;

[0065] After each cycle, the recorded data is reviewed periodically to identify changes in the relationship between stress, strain and time. Based on the changes in each cycle, a report is generated to analyze the mechanical response of the soil sample, including the evolution of strength and deformation characteristics over time.

[0066] It should be noted that the improved gas adsorption method, while considering the effects of temperature and humidity, introduces the relationship between porosity and average pore size:

[0067]

[0068] Among them, V p is the pore volume, V s is the solid volume, m g is the mass of the gas, R is the gas constant, T is the temperature, P is the gas pressure, V g is the gas volume.

[0069] The porosity and average pore size data were obtained at different stages of the wet-dry cycle and integrated into a database to model the pore pressure changes using the following relationship:

[0070] ΔP=α n (S-S0)+β d (dd ref )

[0071] Where ΔP is the change in pore pressure, α n is the parameter of soil response intensity to saturation change, β d is the sensitivity coefficient of the average pore size change on the pore pressure, d is the average pore size at the current moment, and d ref is the base aperture.

[0072] S3: Analyze the macroscopic mechanical response and structural evolution characteristics of the sliding zone to reveal the degradation mechanism of the sliding zone strength caused by the water action in the reservoir area.

[0073] Furthermore, as the water saturation increases, the cohesion and internal friction angle of the sliding zone soil gradually decrease. Specifically, at a low saturation of 35%, the cohesion is strong and the soil is stable. As the water saturation increases to more than 75%, the cohesion and internal friction angle decrease, and the landslide risk increases.

[0074] In the initial stage, the high water level causes a rapid decrease in soil strength, but in the stable period after the soil is fully saturated, the mechanical properties temporarily recover. Repeated dry-wet cycles cause the soil structure to gradually soften, and the strength and deformation properties show a trend of gradual deterioration.

[0075] After the dry-wet cycle, the porosity of the soil increases and the pore structure becomes complex, which leads to an increase in the permeability of the soil, a more serious loose state, a change in the average value of the pore size, and the appearance of microcracks and pore expansion.

[0076] Combined with the reduction in strength parameters and changes in pore structure, it is deduced that the stability of the landslide deposit decreases under repeated dry-wet cycles: the hydraulic effect and soil strength reduction caused by periodic changes in water levels increase the probability of landslides. Under the influence of rainfall and water level fluctuations, the landslide body will undergo a transition from relative stability to critical instability.

[0077] It should be noted that, combining the macroscopic mechanical data with the changes in the microstructure, based on the degradation mechanism, the landslide stability analysis formula is constructed:

[0078]

[0079] Among them, FS is the safety factor, γ is the unit gravity of soil, H is the height of landslide, and ε is the shear strength of sliding zone.

[0080] Design an overall analysis framework, define data sources, integrate macro and micro analysis results, form recommendations to assist decision-making through analysis results, and feed back into landslide management and prevention work to provide a scientific basis.

[0081] Example 2, reference Figure 2 , which is an embodiment of the present invention, provides a method for analyzing the mechanical properties of landslide deposits in a reservoir area based on dry-wet cycles. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0082] (1) Sliding belt specimens with different degrees of dry and wet degradation

[0083] ①Collate and analyze the on-site survey data of typical landslides in the Suofengying reservoir area, and select 1 to 2 typical landslide accumulation bodies as the sampling base for this project research. After sampling, maintain the natural moisture content of the slide belt and test indicators such as natural density and moisture content.

[0084] ② Place the sample in a 120℃ oven for 12 hours to dry, crush the dried sample, and then use an analytical sieve to sieve the sample.

[0085] ③ Prepare a sample with a size of 100×100×100mm cube. Use the vacuum saturation method to simulate the wetting process of sliding zone soil (vacuum for 2h, soak for 10h); dry it in an oven to the natural moisture content to simulate the drying process of sliding zone soil. Set different dry-wet cycles.

[0086] (2) Direct shear test of sliding belt of pile under dry-wet cycle

[0087] ① Carry out a direct shear test of sliding belt under dry-wet cycle action. The normal stress during the test is determined according to the sampling depth. During the test, first apply the normal stress to the sample to a predetermined value, keep the normal stress unchanged, and apply horizontal shear stress until the sample is destroyed.

[0088] ② Study the shear strength, residual shear strength and deformation characteristics of the sliding belt specimens with different dry-wet cycles; sort out the shear test results of the sliding belt specimens under different normal stresses, and determine the shear strength parameters c, Values ​​and residual shear strength parameters cr, value.

[0089] (3) Evolution of sliding zone microstructure characteristics before and after dry-wet cycles

[0090] ① Dry the sliding belt samples with different numbers of dry-wet cycles, and take two samples from the most representative parts for microstructure characteristic tests, including scanning electron microscopy (SEM), nuclear magnetic resonance (NMR), and CT scanning tests.

[0091] ② Analyze the particle skeleton, pore morphology and other information of the sliding belt after different numbers of dry-wet cycles, convert the pore size distribution evolution characteristics according to the pore distribution, establish a microscopic model that can finely characterize the sample, and study the intrinsic connection between the macroscopic mechanical behavior and microstructure under the action of dry-wet cycles.

[0092] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0093] Embodiment 3, the third embodiment of the present invention, is different from the first two embodiments in that:

[0094] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0095] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0096] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0097] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0098] Example 4, reference Figure 3 , which is an embodiment of the present invention, provides a mechanical property analysis system for landslide accumulation in a reservoir area based on dry-wet cycles, characterized by: comprising a water level control module 1, a mechanical property monitoring module 2, a pore structure analysis module 3, a macroscopic mechanical response analysis module 4, and a decision support module 5;

[0099] Water level control module 1 is responsible for regulating the water level of the landslide accumulation body in the reservoir area through the water level regulating valve and pump system to simulate the dry-wet cycle;

[0100] Mechanical property monitoring module 2, which continuously monitors the strength and deformation characteristics of sliding zone soil at different water saturations through strain gauges and pressure sensors. It automatically records the initial stress and strain state and monitors the feedback data in real time while applying stress at each dry-wet cycle stage;

[0101] Pore ​​structure analysis module 3 uses an improved gas adsorption method to determine the porosity and average pore size of sliding zone soil samples, analyzes the changes in pore structure at different dry-wet cycle stages, and integrates relevant data into a database to support further mechanical property analysis;

[0102] Macro-mechanical response analysis module 4: overall analysis of the macro-mechanical response and structural evolution characteristics of sliding zone soil, including analysis of changes in strength parameters and assessment of landslide risks at different saturations;

[0103] Decision support module 5, based on the analysis results obtained from other modules, constructs a degradation model of the landslide deposit to provide scientific basis and management suggestions for decision makers.

[0104] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. The mechanical characteristics analysis method of landslide accumulation in reservoir area based on dry-wet cycle is characterized by: include, Simulate the dry-wet cycle of landslide deposits in the reservoir area; Determine the strength and deformation characteristics of sliding zone soils with different water saturations; The macroscopic mechanical response and structural evolution characteristics of the sliding zone are analyzed to reveal the degradation mechanism of the sliding zone strength caused by the water action in the reservoir area.

2. The method for analyzing mechanical properties of landslide deposits in a reservoir area based on dry-wet cycles according to claim 1 is characterized in that: The simulation of the dry-wet cycle includes using a water level regulating valve, setting a water tank, maintaining a certain connection with the landslide accumulation body in the reservoir area, installing a water level sensor, monitoring the water level change of the landslide accumulation body in real time, and feeding the data back to the control system; Set the timer in the control system to ensure that each water level maintenance stage switches automatically to form a complete cycle. Use a data recorder to record the exact start and end time of each stage. Use a water level sensor to feed real-time data back to the control system to automatically adjust the opening and closing of pumps and valves. The implementation of different water level stages is controlled by the program. After each cycle, the system automatically generates a report showing the water / soil ratio and reaction conditions of the corresponding soil body, providing data support for subsequent analysis.

3. The method for analyzing mechanical properties of landslide accumulation in a reservoir area based on dry-wet cycles according to claim 2 is characterized in that: The real-time monitoring of the water level change of the landslide accumulation body includes setting the parameters of the periodic water level change, the high water level, the low water level, the rate of rise and fall and the maintenance time in the control system, and determining the periodicity of the dry-wet cycle. The cycle time will include the stages of water level rise, maintenance, decrease and maintenance again; At the high water level stage, the pump system is turned on to inject water into the landslide accumulation body, so that the water level quickly rises to the set high water level and is maintained for a period of time to observe the saturation response of the soil; After the high water level is maintained, turn off the pump and open the drain valve to gradually lower the water level to the set low water level. The reduction rate should be steady to avoid causing instantaneous instability of the soil. In the low water level stage, maintain a dry state for a period of time to allow the soil to experience a water loss process. Subsequently, repeat the above-mentioned rising and falling process to form a dry-wet cycle.

4. The method for analyzing mechanical properties of landslide accumulation in a reservoir area based on dry-wet cycles as claimed in claim 3 is characterized by: The determination of the strength and deformation characteristics of sliding zone soil under different water saturations includes analyzing the influence of different water saturations on the strength parameters of sliding zone soil, deducing based on the data obtained during the dry-wet cycle simulation process, determining the pore structure of the sliding zone soil sample, and analyzing the pore characteristics and evolution law under dry-wet cycle conditions; Analysis of cohesion c at different saturations s and internal friction angle φ s By fitting the experimental data through linear regression, the following relationship is obtained: c s =c0+k c (S-S0) φ s =φ0+k φ (S-S0) Among them, S is water saturation, S0 is base saturation, k c and k φ is a sensitivity parameter related to saturation, c0 is the cohesion at the initial moisture stage, and φ0 is the friction angle at the initial moisture state; Through the strain gauges and pressure sensors on the sliding belt soil samples, at the beginning of each dry-wet cycle stage, the system automatically records the initial stress and strain state as the baseline data. When applying stress, the sensor feedback data is monitored in real time, and the applied stress value and strain change are recorded. At the end of each dry-wet cycle stage, the system automatically saves the strength and deformation data of the current stage and records the timestamp; After each cycle, the recorded data is reviewed periodically to identify changes in the relationship between stress, strain and time. Based on the changes in each cycle, a report is generated to analyze the mechanical response of the soil sample, including the evolution of strength and deformation characteristics over time.

5. The method for analyzing mechanical properties of landslide accumulation in a reservoir area based on dry-wet cycles according to claim 4 is characterized in that: The determination of the pore structure of the sliding zone soil sample includes using an improved gas adsorption method, taking into account the influence of temperature and humidity, obtaining porosity and average pore size data at different dry-wet cycle stages, and integrating them to form a database; The pore pressure changes are modeled using the following relationship: ΔP=a n (S-S0)+β d (dd ref ) Where ΔP is the change in pore pressure, α n is the parameter of soil response intensity to saturation change, β d is the sensitivity coefficient of the average pore size change on the pore pressure, d is the average pore size at the current moment, and d ref is the base aperture.

6. The method for analyzing mechanical properties of landslide accumulation in a reservoir area based on dry-wet cycles according to claim 5 is characterized in that: The analysis of the macroscopic mechanical response and structural evolution characteristics of the sliding zone includes that as the water saturation increases, the cohesion and internal friction angle of the sliding zone soil gradually decrease, specifically, at a low saturation of 35%, the cohesion is strong and the soil is stable, and as the water saturation increases to more than 75%, the cohesion and internal friction angle decrease, and the landslide risk increases; In the initial stage, the high water level causes a rapid decrease in soil strength, but in the stable period after the soil is fully saturated, the mechanical properties temporarily recover. Repeated dry-wet cycles cause the soil structure to gradually soften, and the strength and deformation properties show a trend of gradual deterioration. After the dry-wet cycle, the porosity of the soil increases and the pore structure becomes complex, which leads to an increase in the permeability of the soil, a more serious loose state, a change in the average value of the pore size, and the appearance of microcracks and pore expansion. Combined with the reduction in strength parameters and changes in pore structure, it is deduced that the stability of the landslide deposit decreases under repeated dry-wet cycles: the hydraulic effect and soil strength reduction caused by periodic changes in water levels increase the probability of landslides. Under the influence of rainfall and water level fluctuations, the landslide body will undergo a transition from relative stability to critical instability.

7. The method for analyzing mechanical properties of landslide accumulation in a reservoir area based on dry-wet cycles according to claim 6 is characterized in that: The degradation mechanism includes combining macroscopic mechanical data with microstructural changes, constructing a degradation model of sliding zone soil, designing an overall analysis framework, defining data sources, integrating macroscopic and microscopic analysis results, and forming auxiliary decision-making recommendations based on the results of the analysis, which are fed back into landslide management and prevention work to provide a scientific basis.

8. A system using the method for analyzing mechanical properties of landslide accumulation in a reservoir area based on dry-wet cycles as claimed in any one of claims 1 to 7, characterized in that: It includes water level control module, mechanical property monitoring module, pore structure analysis module, macroscopic mechanical response analysis module and decision support module; The water level control module is responsible for regulating the water level of the landslide accumulation body in the reservoir area through the water level regulating valve and pump system to simulate the dry-wet cycle; The mechanical property monitoring module continuously monitors the strength and deformation characteristics of sliding zone soil at different water saturations through strain gauges and pressure sensors. It automatically records the initial stress and strain state and monitors the feedback data in real time while applying stress in each dry-wet cycle stage. The pore structure analysis module uses an improved gas adsorption method to measure the porosity and average pore size of sliding zone soil samples, analyzes the changes in pore structure at different dry-wet cycle stages, and integrates relevant data into a database to support further mechanical property analysis; The macro-mechanical response analysis module comprehensively analyzes the macro-mechanical response and structural evolution characteristics of the sliding zone soil, including the analysis of the change of strength parameters and the assessment of landslide risks at different saturations; The decision support module constructs a degradation model of the landslide accumulation body based on the analysis results obtained from other modules, and provides scientific basis and management suggestions for decision makers.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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