A method and system for analyzing freeze-thaw damage of rock slopes in mines

Abstract

The present invention relates to the technical field of mine rock slope analysis, specifically to a freeze-thaw damage analysis method and system for mine rock slopes, the method comprising the following steps: selecting mine rock slope samples, performing freeze-thaw cycle tests on the mine rock slope samples, and obtaining rock freeze-thaw test information; setting displacement analysis indicators according to the rock freeze-thaw test information, and obtaining displacement changes of the rock slope under freeze-thaw cycles based on the displacement analysis indicators; analyzing the plastic damage of the rock slope under freeze-thaw cycles and the mine safety factor based on the rock freeze-thaw test information; establishing a stress analysis model according to the rock freeze-thaw test information, and obtaining the stress distribution of the rock slope under freeze-thaw cycles through the stress analysis model; and analyzing the damage results of the mine rock slope in combination with the displacement change, plastic damage, mine safety factor and stress distribution. The present invention analyzes the freeze-thaw damage of the mine rock slope based on multiple objectives to ensure the stability of the rock slope.

Description

Technical Field

[0001] The invention relates to the technical field of mine rock slope analysis, and in particular to a mine rock slope freeze-thaw damage analysis method and system. Background Art

[0002] During the freeze-thaw cycle, the freezing and melting of water in the pores of the rock will cause the volume of the rock to expand and contract, which in turn will cause the expansion and penetration of microcracks inside the rock, and ultimately lead to the degradation of the macroscopic mechanical properties of the rock. This process involves complex physical, chemical and mechanical effects, including the formation and disappearance of ice crystals, changes in pore water pressure, and changes in the microstructure of the rock.

[0003] The dynamic development of open-pit mine slopes in cold regions is significantly affected by seasonal temperature changes. The slope morphology shows a cycle of freezing in winter and melting in spring with periodic temperature changes. Different rock slopes have different exposure times and experience different degrees of freeze-thaw damage. The freeze-thaw effect has an important impact on the stability of the slope, which in turn causes geological disasters such as landslides and collapses in the rock slopes of mines.

[0004] Under complex and changeable geological conditions, the existing analysis methods for freeze-thaw damage of rock slopes ignore the mutual influence between the microstructural changes and macroscopic mechanical properties of rocks during the freeze-thaw process, and it is difficult to capture the changing state of slope soil under the action of freeze-thaw. Therefore, the existing analysis methods cannot fully and accurately reflect the impact of freeze-thaw damage on slope stability, and thus have certain limitations in predicting and preventing geological disasters such as landslides and collapses. Summary of the invention

[0005] In view of the shortcomings of existing methods and the needs of practical applications, the present invention analyzes factors such as displacement, plasticity, safety index and stress of rock slopes under freeze-thaw cycles based on test information, which helps to comprehensively and accurately reflect the damage and stability of rock slopes under freeze-thaw cycles. On the one hand, the present invention provides a method for analyzing freeze-thaw damage of rock slopes in mines, which includes the following steps: selecting a rock slope sample in a mine, conducting a freeze-thaw cycle test on the rock slope sample in the mine, and obtaining rock freeze-thaw test information; setting a displacement analysis index according to the rock freeze-thaw test information, and obtaining the displacement change of the rock slope under freeze-thaw cycles based on the displacement analysis index; analyzing the plastic damage of the rock slope under freeze-thaw cycles and the safety factor of the mine based on the rock freeze-thaw test information; establishing a stress analysis model based on the rock freeze-thaw test information, and obtaining the stress distribution of the rock slope under freeze-thaw cycles through the stress analysis model; analyzing the damage results of the rock slope under freeze-thaw cycles in mines in combination with the displacement change, the plastic damage, the safety factor of the mine and the stress distribution. The present invention combines displacement changes, plastic damage, mine safety factor and stress distribution to comprehensively evaluate the damage results of mine rock slopes under freeze-thaw cycles, providing a scientific basis for mine slope management measures and disaster prevention and mitigation plans.

[0006] Optionally, the freeze-thaw cycle test is performed on the mine rock slope sample and the rock freeze-thaw test information is obtained, including: setting the freeze-thaw temperature range, freeze-thaw cycle time and freeze-thaw cycle number based on the characteristics of the mine rock slope sample; performing the freeze-thaw cycle test on the mine rock slope sample according to the freeze-thaw temperature range, the freeze-thaw cycle time and the freeze-thaw cycle number, and obtaining the rock freeze-thaw test information. The present invention takes into account the specific characteristics of the mine rock slope sample, and can more accurately set the freeze-thaw conditions, so that the test data is closer to the actual environment, thereby improving the pertinence and accuracy of the test results.

[0007] Optionally, the setting of the displacement analysis index according to the rock freeze-thaw test information includes: setting a first analysis index according to the rock freeze-thaw test information, the first analysis index including the rock mass loss rate; setting a second analysis index according to the rock freeze-thaw test information, the second analysis index including the rock porosity. The present invention can quantitatively evaluate the degree of damage and microstructural changes of rocks during the freeze-thaw cycle by setting the analysis index, providing a reliable basis for slope stability analysis, and combining multiple analysis indicators to more comprehensively understand the changes of rocks under the action of freeze-thaw, providing a comprehensive judgment basis for slope management and disaster prevention and mitigation.

[0008] Optionally, obtaining the displacement change of the rock slope under freeze-thaw cycles based on the displacement analysis index includes: analyzing the displacement change of the rock slope under freeze-thaw cycles in combination with the rock mass loss rate, the rock porosity and the rock freeze-thaw test information;

[0009] The rock mass loss rate satisfies the following relationship:

[0010] ,

[0011] in, represents the mass loss rate of rock, represents the mass of the rock in the initial dry state, express The quality of the rock in the dry state after the first freeze-thaw;

[0012] The rock porosity satisfies the following relationship:

[0013]

[0014] in, The porosity of the rock. express The saturated mass of rock after the first freeze-thaw express The quality of the rock in the dry state after the first freeze-thaw. represents the density of water, Indicates the height of the rock. Indicates the cross-sectional area of ​​the rock. The present invention quantifies and predicts the results of different efficacy evaluation factors based on a mathematical model, and combines the parameters, correlation coefficients and cancer efficacy information corresponding to different efficacy evaluation factors to accurately calculate the prediction results of each efficacy evaluation factor.

[0015] Optionally, the analyzing the plastic damage condition of the rock slope under freeze-thaw cycles and the safety factor of the mine based on the rock freeze-thaw test information includes: establishing a safety factor prediction model according to the plastic damage condition and the rock freeze-thaw test information;

[0016] The safety factor prediction model satisfies the following relationship:

[0017]

[0018] in, represents the safety factor of the rock slope, Indicates the freezing depth of the rock slope, Indicates the length of the rock slope. The present invention can quantify the stability risk of the rock slope under the freeze-thaw cycle into a specific value through the safety factor prediction model, and can intuitively understand the safety status of the slope.

[0019] Optionally, the establishment of a stress analysis model based on the rock freeze-thaw test information includes: constructing a shear stress analysis model based on the rock freeze-thaw test information; constructing a principal stress analysis model based on the rock freeze-thaw test information and the shear stress analysis model; and obtaining a stress analysis model based on the shear stress analysis model and the principal stress analysis model. The present invention uses a stress analysis model to accurately predict the mechanical behavior of rocks under freeze-thaw cycles, which helps to accurately analyze the freeze-thaw damage of rocks.

[0020] Optionally, the shear stress analysis model satisfies the following relationship:

[0021]

[0022] in, is the shear stress of the rock, is the load on the rock, Indicates the angle between the rock and the horizontal ground ， represents the friction coefficient of the shear force measuring roller, The model of the present invention takes into account multiple factors such as the angle between the rock and the horizontal ground and the friction coefficient of the shear force measurement roller, and can more comprehensively evaluate the stress distribution of the rock.

[0023] Optionally, the principal stress analysis model satisfies the following relationship:

[0024]

[0025] in, represents the maximum principal stress, represents the uniaxial compressive strength of rock, represents the confining pressure correlation coefficient, represents the minimum principal stress, The cohesive force of the rock. Indicates the internal friction angle of the rock. The model of the present invention integrates multiple factors such as the rock's compressive strength, confining pressure coefficient, stress, cohesion and friction angle, and can more comprehensively reflect the mechanical properties of the rock.

[0026] Optionally, the analysis of the damage results of the rock slope of the mine under the freeze-thaw cycle in combination with the displacement change, the plastic damage, the mine safety factor and the stress distribution includes: setting damage analysis factors of the rock slope of the mine under the freeze-thaw cycle, and obtaining damage analysis results, the damage analysis factors including the displacement change, the plastic damage, the mine safety factor and the stress distribution; and evaluating the stability of the rock slope of the mine in combination with the damage analysis results and the rock freeze-thaw test information. The present invention comprehensively considers factors such as displacement change, plastic damage, safety factor and stress distribution, can more comprehensively evaluate the damage of the rock slope of the mine under the freeze-thaw cycle, can more accurately reflect the actual state of the slope, and avoid evaluation deviations caused by a single factor.

[0027] In the second aspect, in order to be able to efficiently execute a mine rock slope freeze-thaw damage analysis method provided by the present invention, the present invention also provides a mine rock slope freeze-thaw damage analysis system, including a processor, an input device, an output device and a memory, wherein the processor, the input device, the output device and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the mine rock slope freeze-thaw damage analysis method as described in the first aspect of the present invention. The mine rock slope freeze-thaw damage analysis system of the present invention has a compact structure and stable performance, and can stably execute the mine rock slope freeze-thaw damage analysis method provided by the present invention, thereby improving the overall applicability and practical application capabilities of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The flowchart of the method for analyzing freeze-thaw damage of rock slope in mines of the present invention is as follows;

[0029] Figure 2 It is a schematic diagram of the mass loss change of the rock slope under the freeze-thaw cycle of the present invention;

[0030] Figure 3 It is a schematic diagram of the porosity change of the rock slope under the freeze-thaw cycle of the present invention;

[0031] Figure 4 It is a schematic diagram of displacement change of rock slope under freeze-thaw cycle of the present invention;

[0032] Figure 5 It is a schematic diagram of the plastic damage of the rock slope under the freeze-thaw cycle of the present invention;

[0033] Figure 6 It is a schematic diagram of the safety factor curve of the rock slope of the present invention;

[0034] Figure 7 This is a schematic diagram of the maximum principal stress-time relationship of a rock slope under freeze-thaw cycles of the present invention;

[0035] Figure 8 This is a structural diagram of the mine rock slope freeze-thaw damage analysis system of the present invention. DETAILED DESCRIPTION

[0036] See also Figure 1 The present invention systematically analyzes the key elements of the displacement change, plastic damage, safety index and stress distribution of the rock slope under the action of freeze-thaw cycles, which not only significantly enhances the understanding of the damage mechanism of the rock slope under the freeze-thaw environment, but also provides strong technical support for the comprehensive and accurate evaluation of the slope stability. The present invention provides a freeze-thaw damage analysis method for the rock slope of a mine, and the freeze-thaw damage analysis method for the rock slope of a mine includes the following steps:

[0037] S1. Select rock slope samples from mines, conduct freeze-thaw cycle tests on the rock slope samples from mines, and obtain rock freeze-thaw test information. The specific implementation steps and contents are as follows;

[0038] Firstly, based on the characteristics of the mine rock slope samples, the freeze-thaw temperature range, freeze-thaw cycle time and the number of freeze-thaw cycles are set, and the specific contents are as follows;

[0039] In the embodiment, three groups of mine rock slope samples with different moisture contents were selected and numbered A, B, and C respectively. Freeze-thaw cycle tests were carried out on the mine rock slope samples to simulate and study the freeze-thaw process of the mine rock slope in the natural environment.

[0040] During the test, it is necessary not only to observe the damage signs on the rock surface under different freeze-thaw cycles, such as crack extension and spalling, but also to use advanced technologies such as ultrasonic wave velocity testing and thermal conductivity measurement to deeply analyze the damage caused by freeze-thaw cycles to the internal structure of mine rock slope samples from a microscopic level.

[0041] Different rock samples have different physical and mechanical properties and microstructural characteristics, and the response characteristics of the above characteristics to freeze-thaw cycles are also different. Therefore, it is necessary to set freeze-thaw conditions that match the sample characteristics, which is conducive to more accurate evaluation of the damage and stability changes of rocks under freeze-thaw cycles. In the embodiment, the freeze-thaw temperature range, freeze-thaw cycle time and number of freeze-thaw cycles are set based on the characteristics of the mine rock slope samples.

[0042] 1. Set and select the freeze-thaw temperature range.

[0043] Based on the historical meteorological data of the area where the mine rock slope samples are located, the annual temperature fluctuations, monthly minimum and maximum temperatures, and extreme temperatures in the area where the samples are located are analyzed. In order to more realistically simulate the diurnal and seasonal temperature changes experienced by the above-mentioned mine rock slope samples, in this embodiment, the freeze-thaw temperature range is set between the extreme minimum temperature and the extreme maximum temperature based on the meteorological data, so as to fully cover the extreme low temperature and normal temperature environments that the mine rock slope samples in the area may encounter, thereby ensuring the accuracy and representativeness of the test results.

[0044] 2. Set the freeze-thaw cycle time.

[0045] According to the all-day temperature and climate monitoring data of the area where the mine rock slope samples are located, the average daily freezing period or freezing duration in the area is obtained. In order to accurately simulate the temperature change process under natural conditions, the freeze-thaw cycle time is set to a 16-hour freezing stage and an 8-hour melting stage based on the freezing period information embodiment. The whole cycle is 24 hours in total. The above time setting conditions ensure that the test results can truly reflect the day and night temperature changes experienced by the mine rock slope samples in the actual environment, thereby drawing test conclusions that are closer to the actual environment.

[0046] 3. Set the number of freeze-thaw cycles.

[0047] After comprehensively analyzing the actual number of freezing and thawing days experienced by the area where the mine rock slope samples are located and the specific conditions of the laboratory, 30 times were selected as the maximum number of freeze-thaw cycles for the test in the embodiment. This number of freeze-thaw cycles not only takes into account the freeze-thaw cycle impact that the mine rock slope samples may suffer over a long period of time, but also takes into account the operability and result stability under laboratory conditions. After simulating 30 freeze-thaw cycles, the changes in the physical and mechanical properties of the mine rock slope under repeated freeze-thaw action and its impact on the slope stability can be fully revealed.

[0048] Furthermore, the rock freeze-thaw test conditions in this embodiment are only an optional condition of the present invention. In other embodiments, the rock freeze-thaw test conditions can be flexibly adjusted according to the experimental objectives and experimental equipment conditions. Mining rock slopes in different regions face different natural environmental conditions, including temperature, humidity, rainfall, etc. Customizing freeze-thaw test conditions according to specific experimental objectives can more accurately simulate the natural environment experienced by rocks in the target area and reduce uncertainties in the test process.

[0049] Then, according to the above freeze-thaw temperature range, freeze-thaw cycle time and freeze-thaw cycle number, the freeze-thaw cycle test was carried out on the mine rock slope samples, and the rock freeze-thaw test information was obtained, the specific contents of which are as follows;

[0050] The initial mass and ultrasonic wave velocity of the mine rock slope samples were systematically measured. Subsequently, by implementing different numbers of freeze-thaw cycles (5 times, 10 times, 20 times, and 30 times), the mass change and ultrasonic wave velocity change after each cycle were recorded one by one, and the relationship curve between mass change and freeze-thaw number, as well as the curve of ultrasonic wave velocity change with freeze-thaw number were drawn, and then the law of evolution of relevant physical properties with freeze-thaw process was deeply analyzed. At the same time, it is also necessary to pay close attention to the destruction of mine rock slope samples, such as cracks, spalling and other phenomena, and record the number of freeze-thaw cycles when the above phenomena first appeared in detail, which is helpful to evaluate the stability of rock slopes. Furthermore, thermal conduction measurements were carried out on mine rock slope samples, and the thermal conductivity of each was measured and recorded under 5, 10, 20, and 30 freeze-thaw cycles. The thermal conductivity-freeze-thaw number curve can also be drawn to summarize its change law and its influence on the test results.

[0051] Then, systematic strength tests were carried out on the mine rock slope samples to evaluate their mechanical properties under different conditions. For the mine rock slope samples, it is necessary to measure their initial uniaxial compressive strength in a completely dry state, and then obtain the basic mechanical properties of the rock slope samples without any environmental treatment, providing benchmark data for subsequent comparative analysis. In addition, a complex test process is required to explore the effect of freeze-thaw cycles on their uniaxial compressive strength. The mine rock slope samples are placed in a saturated state and then their initial uniaxial compressive strength is measured, which helps to understand the effect of water saturation on the strength of the rock slope samples. Furthermore, after the above-mentioned mine rock slope samples have undergone multiple freeze-thaw cycles, the uniaxial compressive strength of the mine rock slope samples was measured again, thereby revealing the effect of short-term freeze-thaw cycles on the strength of the rock slope, and the freeze-thaw resistance of the rock slope can also be evaluated.

[0052] In an optional embodiment, the mine rock slope samples of group A are placed in an electric constant temperature blast drying box for thorough drying; the mine rock slope samples of group B are used as a control group and are kept in their original state without any treatment; the mine rock slope samples of group C are subjected to free immersion method to ensure that the interior of the rock is fully saturated with water to reach a predetermined moisture content state.

[0053] Performance tests were conducted on all mining rock slope samples in groups A, B and C in their initial state, including but not limited to precise measurements of mass, area, ultrasonic wave velocity and thermal conductivity, and relevant data were recorded in detail as a basis for subsequent comparative analysis.

[0054] Group A and Group C were selected to conduct uniaxial compression tests in the initial state using a universal material testing machine. During this process, the stress-strain relationship and uniaxial compressive strength of the test blocks were closely monitored and recorded to evaluate their initial mechanical properties.

[0055] The three groups of test blocks A, B, and C were placed in a horizontal ultra-low temperature test chamber and subjected to strict freeze-thaw cycle treatment. Each cycle included 16 hours of freezing (at ultra-low temperature) and subsequent 8 hours of thawing (in a 20°C constant temperature chamber), totaling 24 hours. The entire test process was repeated 30 times of freeze-thaw cycles to simulate the long-term freeze-thaw effect of the rock edge of the mine in the natural environment.

[0056] After completing 5, 10, 20 and finally 30 freeze-thaw cycles, the mass, area, ultrasonic wave velocity and thermal conductivity of the mine rock slope samples were measured. Group A was dried in a drying oven for 24 hours before measurement to eliminate moisture interference; Group B was left at room temperature for 24 hours to reach a stable state; Group C was soaked in pure water for 24 hours, and then the surface moisture was quickly wiped off with a dry towel for measurement.

[0057] Further tests were carried out on the mine rock slope samples after freeze-thaw. After a specific number of freeze-thaw cycles (5th, 10th, 20th and 30th), the corresponding mine rock slope samples in Group C were selected for uniaxial compression tests. The stress-strain curve and uniaxial compressive strength data of each test were recorded and analyzed to explore the influence of freeze-thaw cycles on the performance of mine rock slope samples and their changing patterns.

[0058] In this embodiment, the freeze-thaw conditions that match the sample characteristics include but are not limited to the temperature range, cycle time and number, which can more accurately simulate the freeze-thaw process experienced by rocks in the actual environment, thereby more accurately evaluating the damage of rocks under freeze-thaw cycles. During the experiment, the key parameter information of the samples at different freeze-thaw stages was recorded in detail to obtain rock freeze-thaw test information, which provides a reliable basis for evaluating rock damage, helps to establish a rock damage-related analysis model later, and predicts the stability change trend of rocks under long-term freeze-thaw effects.

[0059] Furthermore, the method for obtaining rock freeze-thaw test information in the present embodiment is only an optional condition of the present invention. In other embodiments, the method for obtaining mine rock slope information can be flexibly selected according to actual conditions. By flexibly selecting the information acquisition method, more diversified and comprehensive rock freeze-thaw test data can be collected, providing solid support for subsequent data analysis, model construction and result analysis.

[0060] S2. Displacement analysis indicators are set according to the rock freeze-thaw test information, and the displacement change of the rock slope under the freeze-thaw cycle is obtained based on the displacement analysis indicators. The specific implementation steps and contents are as follows;

[0061] In order to comprehensively and scientifically evaluate the displacement of rock slopes under freeze-thaw cycles, a displacement analysis system was designed based on the rock freeze-thaw test information. The system mainly includes rock mass loss rate and rock porosity to accurately analyze the relationship between rock sample quality and structural changes and rock slope displacement.

[0062] In the embodiment, the rock mass loss rate is used as the first analysis indicator. After 5, 10, 20, and 30 freeze-thaw cycles, the difference between the mass of the rock slope samples in the dry state and the initial dry mass is analyzed as a percentage of the initial mass. This not only effectively quantifies the mass attenuation of the rock slope samples during the freeze-thaw process, but also weakens the analysis error caused by the initial mass difference of the samples, providing solid data support for subsequent displacement analysis.

[0063] The above rock mass loss rate satisfies the following relationship:

[0064] ,

[0065] in, represents the mass loss rate of rock, represents the mass of the rock in the initial dry state, express The quality of the rock in the dry state after the first freeze-thaw;

[0066] The mass loss rate refers to the percentage of the difference between the mass of a mine rock slope in a dry state and its initial dry mass after a specific number of freeze-thaw cycles. It can quantitatively analyze the mass attenuation of a mine rock slope under the action of freeze-thaw, and further understand the impact of freeze-thaw cycles on the physical properties of rocks.

[0067] The second analysis index is set according to the rock freeze-thaw test information. In the embodiment, the second analysis index includes rock porosity, which can reflect the changes in the internal spatial structure of the rock and is closely related to the mechanical properties and stability of the rock.

[0068] During the freeze-thaw cycle, the change in porosity is one of the important macroscopic manifestations of physical property degradation. Determining the porosity of rocks after different freeze-thaw cycles can be used as a basis for analyzing freeze-thaw damage in rock slopes.

[0069] The rock porosity satisfies the following relationship:

[0070]

[0071] in, The porosity of the rock. express The saturated mass of rock after the first freeze-thaw express The quality of the rock in the dry state after the first freeze-thaw. represents the density of water, Indicates the height of the rock. Represents the cross-sectional area of ​​the rock.

[0072] Rock porosity is calculated by comparing the difference between the saturated mass and the dry mass of the rock after a specific number of freeze-thaw cycles, combined with the density of water and the geometric dimensions of the rock.

[0073] The saturated mass of rock after freeze-thaw refers to the mass of the rock after it is completely soaked in water and excess water is removed; the mass of rock in a dry state after freeze-thaw refers to the mass of the rock in a dry state after the freeze-thaw cycle.

[0074] Rock porosity reflects the proportion of pore volume inside the rock to the total volume. With the increase of freeze-thaw cycles, the tiny cracks and pores inside the rock may gradually expand, resulting in an increase in porosity. The above changes not only affect the physical properties of the rock, such as permeability and water absorption, but also its mechanical properties and stability.

[0075] Combined with the above rock mass loss rate, rock porosity and rock freeze-thaw test information, the displacement changes of rock slopes under freeze-thaw cycles are analyzed. The specific implementation contents are as follows;

[0076] Under constant stress level conditions, as the number of freeze-thaw cycles increases, the mass loss rate also shows a significant upward trend. This trend can be monitored and characterized by the power function model. For details, see Figure 2 The above fitting curve not only intuitively reveals the quantitative relationship between the two, but also its correlation coefficient is greater than 0.96, indicating that the fitting result of the embodiment is indeed highly reliable, further verifying the effectiveness and accuracy of the rock mass loss rate model.

[0077] Furthermore, based on the rock mass loss rate analysis results and image information, it can be seen that under the same number of freeze-thaw cycles, the stress level during the freeze-thaw process has a significant impact on the rock mass loss rate. That is, as the stress level gradually increases, the damage suffered by the rock during the freeze-thaw process becomes more serious, resulting in a greater mass loss rate. This shows that the stress level is one of the key factors in regulating the degree of rock freeze-thaw damage, and its changes can directly affect the stability and integrity of the rock's internal structure.

[0078] In order to analyze the porosity variation trend and physical mechanism of frozen-thaw slope samples, please refer to Figure 3It intuitively shows the trend of rock porosity changing with the increase of freeze-thaw cycles at different stress levels, and reveals the influence of freeze-thaw cycles on the internal microstructure of rocks. At the same stress level, with the increase of freeze-thaw cycles, the porosity of rocks shows an increasing trend. Due to the freezing expansion effect of pore water inside rocks during freeze-thaw processes and the migration of water under the action of temperature gradient, rocks are destroyed, developed and connected, which in turn promotes the increase in the number of cracks and the complexity of pore structure.

[0079] When the ultimate compressive strength is applied to the slope sample and the freeze-thaw cycle is carried out, the growth rate of porosity is slower than that of the freeze-thaw condition without load. This indicates that the appropriate load can inhibit the destructive effect of the freezing process on the rock pore wall to a certain extent, and offset part of the destructive effect caused by the ice expansion force by enhancing the stress state inside the rock. At the same time, during the thawing process, the low level load may also promote the compaction of pores and cracks inside the rock, thereby further limiting the growth of porosity.

[0080] However, as the load level increases further during the freeze-thaw process, the growth rate of rock porosity increases instead, because the high level of long-term load gradually weakens the bearing capacity of the rock, making the rock more susceptible to rheology and deformation on the basis of freeze-thaw damage. The above deformation process promotes the evolution of small pores inside the rock to large pores and the generation, change and expansion of new cracks, which ultimately leads to a significant increase in the porosity of the rock slope of the mine.

[0081] The displacement changes of rock slopes under freeze-thaw cycles were obtained based on rock mass loss rate and rock porosity, and the contents are as follows;

[0082] The displacement change of the rock slope directly reflects the gradual deformation and failure process of the slope as the freezing and thawing time increases. Figure 4 As an inherent driving force, the gravity field of the slope itself plays a leading role in the displacement change process, exacerbating the development of rock slope displacement. In order to more comprehensively evaluate the impact of freeze-thaw cycles on slope stability, the rock mass loss rate is combined in the embodiment, which directly reflects the degree of rock loss under freeze-thaw action, and then quantitatively analyzes the contribution and mechanism of rock mass change to slope displacement.

[0083] Figure 4The displacement change diagram shown can analyze the displacement change characteristics of the mine rock slope samples at different freeze-thaw stages. Based on the diagram, it can be seen that after 5 freeze-thaw cycles, the overall displacement of the mine rock slope has not shown significant changes, indicating that in the initial stage, the effect of freeze-thaw on slope stability is relatively slight. However, with the continuous accumulation of freeze-thaw cycles, the mine rock slope began to show obvious signs of displacement. After 10 freeze-thaw cycles, the slope surface, especially the upper step rock mass, began to show a small amount of displacement, indicating that the local area of ​​the mine rock slope has been affected by freeze-thaw.

[0084] As the number of freeze-thaw cycles increases, until it reaches 20 or even 30 times, the displacement changes of the mine rock slope become more severe, and the impact of freeze-thaw on the internal structure of the slope is continuous, cumulative and progressive. With the repeated freezing and melting of water, the microcracks inside the rock gradually expand, the pore structure changes significantly, the porosity increases, and the overall strength, stiffness and stability of the rock are weakened.

[0085] The increase in porosity not only directly leads to a reduction in the effective bearing area of ​​the rock slope, but also promotes the penetration and retention of water in a larger range, further exacerbating the scope and intensity of the influence of the frost heave force and thaw settlement effect in the rock. The coupling of the above physical-mechanical processes causes the slope to undergo significant displacement deformation under the freeze-thaw cycle, which can be manifested as the sinking, lateral displacement and even partial collapse of the slope surface in an optional embodiment. Observing and analyzing the displacement changes of rock slopes under freeze-thaw cycles based on the changes in rock porosity not only helps to deeply understand the physical basis of slope stability degradation, but also provides a scientific basis for formulating effective slope protection and reinforcement measures.

[0086] Furthermore, in the present embodiment, the method for analyzing the displacement of the rock slope is only an optional condition of the present invention. In one or some other embodiments, the displacement analysis method can be replaced according to the specific conditions of the mine rock slope and the freeze-thaw damage analysis objectives. Different mine rock slopes have unique geological conditions, rock types, structural characteristics and environmental factors. Selecting or adjusting the displacement analysis method can ensure the accuracy and pertinence of the analysis results and improve the applicability of the freeze-thaw damage analysis method of the mine rock slope.

[0087] S3. Analyze the plastic damage of rock slopes and mine safety factor under freeze-thaw cycles based on rock freeze-thaw test information. The specific implementation steps and contents are as follows:

[0088] In an optional embodiment, the plastic damage of the rock slope under freeze-thaw cycles is analyzed based on rock freeze-thaw test information.

[0089] As the number of freeze-thaw cycles increases, the damage experienced by the rock slope gradually accumulates from subtle to significant. The above process can be clearly presented through the quantitative analysis of equivalent plastic strain, see Figure 5 , which marks the action time corresponding to different freeze-thaw cycles, mainly including 120 hours, 240 hours, 480 hours and 720 hours.

[0090] based on Figure 5 From the schematic diagram of plastic damage, it can be seen that the damage evolution trajectory of the rock slope in different freeze-thaw stages is that there is no obvious sign of plastic damage after 5 freeze-thaw cycles (120 hours). After the subsequent 10 (240 hours), 20 (480 hours) and even 30 (720 hours) freeze-thaw cycles, the damaged area gradually becomes obvious and gradually expands. The above process reflects the continuous effect of freeze-thaw cycles on the slope rock mass.

[0091] After 10 freeze-thaw cycles, the surface of the rock slope, especially the toe of the slope and the shallow parallel slope area, began to show signs of plastic damage, indicating that the freeze-thaw damage mechanism has begun. As the number of freeze-thaw cycles gradually increases, the damaged area significantly expands in area. The damage extension pattern shows an obvious regularity: the damaged area is centered on the toe of the slope, and the damage gradually penetrates into the interior of the slope; at the same time, the damage on the slope spreads in a direction parallel to the slope. The above-mentioned plastic damage distribution not only reveals the local stress concentration effect under the action of freeze-thaw, but also indicates that the overall stability of the slope is gradually decreasing.

[0092] Plastic damage of rock slopes under freeze-thaw cycles is a complex and dynamic process, which involves the interaction and influence of multiple factors and can be intuitively presented through the quantitative analysis of equivalent plastic strain. The above process not only reveals the fragility of rock slopes under extreme environmental conditions, but also provides an important reference for formulating effective protective measures in engineering practice.

[0093] A safety factor prediction model is established based on the above plastic damage conditions and rock freeze-thaw test information;

[0094] The above safety factor prediction model satisfies the following relationship:

[0095]

[0096] in, represents the safety factor of the rock slope, Indicates the freezing depth of the rock slope, Indicates the length of the rock slope.

[0097] Based on the above plastic damage, a rock freeze-thaw safety factor prediction model is established. The various parameters in the above prediction model are interrelated with the actual state of the slope and the freeze-thaw effect. The rock slope safety factor can be directly used as a key indicator to measure the stability of the slope; the freezing depth of the rock slope reflects the depth of the impact of the freeze-thaw cycle on the internal structure of the slope; considering the overall shape and boundary conditions of the slope, the length of the rock slope can affect the stability of the slope.

[0098] In order to further improve the safety factor prediction model, a series of frozen depths and slope lengths of rock slopes under different freeze-thaw cycles were collected based on rock freeze-thaw test information, and the safety factors were obtained through numerical simulation, physical model tests or field monitoring.

[0099] Analyze the data related to the safety factor, explore the potential relationship between freezing depth and slope length and the safety factor, use part of the data as a training set to fit the model parameters, and then use the remaining data as a test set to verify the accuracy and generalization ability of the model; and adjust the model parameters according to the verification results to improve the prediction accuracy of the model, and then apply the adjusted model to actual engineering problems, and further optimize the model based on feedback. As the above-mentioned plastic damage changes, the shape and depth of the sliding surface of the rock slope also change, making the slope more prone to shallow landslides and reducing the overall safety stability. For changes in the safety factor, please refer to Figure 6 .

[0100] Furthermore, in the present embodiment, the safety factor analysis method of the rock slope under the freeze-thaw cycle is only an optional condition of the present embodiment. In one or some other embodiments, the analysis method of the rock slope can be adjusted according to the actual situation of the rock slope and the target requirements of mine stability. The analysis method of the present embodiment is flexible and adjustable, which enhances the adaptability and practicality of the method of the present invention.

[0101] S4. Establish a stress analysis model based on the rock freeze-thaw test information, and obtain the stress distribution of the rock slope under freeze-thaw cycles through the stress analysis model. The specific implementation steps and contents are as follows:

[0102] Based on the information of rock freeze-thaw test, the shear stress evolution data information of the rock slope in a complete freeze-thaw cycle is obtained, and then the influence mechanism of freeze-thaw cycle on the stability of the rock slope is analyzed. As the freeze-thaw cycle proceeds, the mechanical behavior of the slope shows obvious stage characteristics.

[0103] In the early stage of the freeze-thaw cycle, as the temperature drops, frost damage begins to appear on the surface of the rock slope, causing the physical and mechanical properties of the rock slope to deteriorate. During the above process, the shear stress on the slope surface increases significantly, especially in the geometrically weak area at the junction of the steep and gentle toe of the slope, forming a significant stress concentration phenomenon. The above phenomenon indicates that the slope is about to deform and become unstable, and the toe area of ​​the rock slope is the starting point of damage.

[0104] In the middle stage, the freeze-thaw cycle is thawed and stress is released. As the freeze-thaw cycle deepens, the external environment temperature gradually rises, and the frozen water in the cracks inside the rock mass begins to melt. The above process is accompanied by a gradual decrease in the shear stress on the slope surface, indicating that the thawing effect has alleviated the local stress concentration state of the rock slope to a certain extent, but it may also cause new hydrogeological problems, such as intensified seepage.

[0105] The later stage is accompanied by refreezing and stress reconstruction. When the freeze-thaw cycle enters the next low temperature stage, the external environment temperature drops again, the water in the cracks inside the slope freezes again, and the frost heave effect of the ice produces additional frost heave force, further aggravating the stress state inside the rock slope. At this time, the slope shear stress gradually increases again with the decrease in temperature, indicating that the stability of the rock slope will continue to deteriorate.

[0106] Under the repeated freeze-thaw cycle, the rock slope has gone through a complete process from initial freeze damage, mid-term thawing to late refreezing. In the above process, the mechanical properties of the rock mass continue to deteriorate, and the shear stress is repeatedly concentrated and released in weak areas such as the slope foot. Finally, under the action of repeated frost heave force, the rock mass gradually accumulates damage until deformation and failure occur.

[0107] In this embodiment, a shear stress analysis model is constructed based on rock freeze-thaw test information. The shear stress analysis model satisfies the following relationship:

[0108]

[0109] in, is the shear stress of the rock, is the load on the rock, Indicates the angle between the rock and the horizontal ground ， represents the friction coefficient of the shear force measuring roller, Represents the cross-sectional area of ​​the rock.

[0110] The loads on rocks refer to various external forces or external effects that can cause stress, strain or displacement inside them. The above loads can be natural environment or human activities, including but not limited to self-weight stress, tectonic stress, engineering load and earthquake load. The loads on rocks act together on the rock mass, affecting its stability, deformation behavior and failure mode. The load effect in rock engineering design and construction directly affects the safety and stability of the project.

[0111] The angle between the rock and the horizontal ground refers to the angle between the reference plane in the rock and the horizontal plane, which helps to understand the inclination and stability of the rock slope of the mine in this embodiment, and provides a reference for the subsequent damage analysis of the rock slope of the mine.

[0112] The friction coefficient of the shear force measurement roller refers to the ratio between the friction force generated by the relative motion or relative motion trend between the roller and the contact surface of the rock slope sample and the normal pressure on the roller during the shear force measurement process. The above ratio is a dimensionless physical quantity that can be used to describe the friction characteristics of the roller under specific conditions.

[0113] Based on the information from rock freeze-thaw tests, the maximum principal stress of rock slopes under freeze-thaw cycles and time are plotted. Figure 7 Further analyze the stress distribution of rock slopes under freeze-thaw cycles.

[0114] Based on the maximum principal stress variation curve over time, it can be clearly observed that during the periodic freeze-thaw cycle, the maximum principal stress exhibits a significant bidirectional fluctuation characteristic. The above-mentioned fluctuation pattern directly reflects the influence of ambient temperature changes on the internal stress state of the rock slope. In an optional embodiment, when the external ambient temperature drops, the water in the cracks of the rock slope gradually condenses into ice, and the expansion of the volume leads to the generation of significant frost heave force, which in turn causes the slope surface to be subjected to tensile stress, which is manifested as the maximum principal stress value fluctuating in the positive direction. On the contrary, as the external ambient temperature rises, the ice in the cracks gradually melts, the frost heave force is released, the slope is subjected to compressive stress, and the maximum principal stress value falls back to the negative direction.

[0115] In another optional embodiment, under static conditions, that is, when the influence of freeze-thaw cycles is not considered, the stress distribution of the slope is mainly controlled by the effect of gravity. The initial stress state of different monitoring points is obtained based on the rock freeze-thaw test information. The maximum principal stress value at the toe of the slope is significantly higher than that at the top of the slope because it bears the entire weight of the rock slope, and it mainly manifests as a compressive stress state, indicating that under the action of gravity, the stability of the slope is mainly restricted by the stress state in the toe area.

[0116] In another optional embodiment, the influence of freeze-thaw cycles on the stability of rock slopes is analyzed. Under the dynamic action of freeze-thaw cycles, the stability problem of the slope becomes more complicated. Based on the displacement changes, it can be seen that due to the stress concentration and abundant cracks at the foot of the slope, this area becomes the most sensitive and severe area for freeze-thaw action. As the freeze-thaw cycle continues, the maximum principal stress fluctuation amplitude at the foot of the slope increases significantly, which not only aggravates the fatigue damage of the rock slope, but also promotes the further expansion and penetration of the cracks. Combined with the plastic damage analysis information of the slope under freeze-thaw action, it can be seen that the deformation damage of the rock slope starts from the foot of the slope and gradually expands upward, which is helpful to understand the instability mechanism of the slope in the freeze-thaw environment, evaluate the long-term stability of the rock slope, and formulate effective protection measures. It is of great significance.

[0117] The principal stress analysis model is constructed based on the rock freeze-thaw test information and the shear stress analysis model. The principal stress analysis model satisfies the following relationship:

[0118]

[0119] in, represents the maximum principal stress, represents the uniaxial compressive strength of rock, represents the confining pressure correlation coefficient, represents the minimum principal stress, The cohesive force of the rock. Represents the internal friction angle of the rock.

[0120] The maximum principal stress of a rock slope refers to the maximum stress value in all stress directions at a certain point in the rock slope, which can be tensile stress or compressive stress, depending on the force conditions and stress state of the rock.

[0121] The uniaxial compressive strength of rock refers to the load per unit area borne by a mine rock slope sample when it is destroyed by axial force under unconfined conditions, that is, the ratio of the maximum load when the mine rock slope sample is destroyed to the cross-sectional area perpendicular to the loading direction. In the embodiment, the uniaxial compressive strength of the mine rock slope sample is calculated based on the destruction load and the cross-sectional area of ​​the mine rock slope sample.

[0122]

[0123] in, represents the uniaxial compressive strength of rock, represents the failure load of rock, Indicates the cross-sectional area of ​​the rock. Determining the uniaxial compressive strength of rock can provide a scientific basis for engineering design and construction, and further ensure the safety and stability of the project.

[0124] In experiments in rock mechanics or geological engineering, the physical or mechanical properties of rocks under different confining pressures are measured, and the correlation coefficients between the relevant properties and the confining pressure are calculated to evaluate the linear relationship between them. This helps to understand the extent of the influence of confining pressure on rock properties.

[0125] The minimum principal stress of a rock slope refers to the minimum stress value in all stress directions at a certain point in the rock slope, which is of great significance for evaluating the stability of the slope and designing reasonable support measures.

[0126] The cohesion of rock is related to the rock strength index. It refers to the force generated between the particles inside the rock due to cementation, intercalation and attraction between molecules. The above force enables the rock particles to be tightly combined together to form a whole with certain strength and stability. In actual engineering, the cohesion of rock is an important prerequisite for ensuring the safety and stability of the project.

[0127] The internal friction angle of rock is a quantitative indicator of the relationship between the normal stress and internal friction on the shear surface when the rock is sheared, reflecting the resistance caused by friction between the particles inside the rock. The internal friction angle of rock is also an important parameter to describe the shear strength characteristics of rock. Its size is affected by many factors such as the physical properties and structural characteristics of the rock. In practical applications, it is necessary to measure and analyze the internal friction angle of rock according to specific circumstances.

[0128] In order to comprehensively analyze the stress distribution of the rock slope in the embodiment, the shear stress analysis result and the principal stress analysis structure are combined.

[0129] The shear stress analysis model mainly focuses on the behavior of rock under shear, especially the stress distribution and failure mechanism on the shear surface. In rock slopes, shear stress is one of the key factors in evaluating slope stability and failure mode.

[0130] The principal stress analysis model mainly analyzes the distribution and changes of the principal stress inside the rock. The principal stress directly determines the strength and stability of the rock. After the slope is formed, due to the redistribution of stress, the direction and magnitude of the principal stress will change, especially in the area close to the free surface.

[0131] According to the analysis results of shear stress and principal stress, the distribution of slope stress is analyzed. In particular, the changes in the shear stress concentration area and the principal stress direction are analyzed. At the same time, combined with the geometric shape of the rock slope and external environmental conditions, the stress distribution is adjusted and verified.

[0132] Furthermore, the analysis method of the slope stress distribution condition in the present embodiment is only an optional condition of the present embodiment. In one or some other embodiments, the stress analysis method can be optimized according to the actual situation of the rock slope and the stress distribution properties, which can more accurately reflect the stress state of the rock slope, thereby improving the comprehensiveness and accuracy of the analysis results.

[0133] S5. Combined with the displacement change, plastic damage, mine safety factor and stress distribution, the damage results of the mine rock slope under the freeze-thaw cycle are analyzed. The specific implementation steps and contents are as follows:

[0134] In this embodiment, damage analysis factors of the mine rock slope under freeze-thaw cycles are set, and damage analysis results are obtained. The damage analysis factors mainly include displacement changes, plastic damage, mine safety factor and stress distribution.

[0135] Displacement change is an important indicator of the degree of deformation of rock slopes in mines. Under the action of freeze-thaw cycles, rocks expand and contract due to temperature changes, causing the slope to move. By analyzing the displacement data of key points on the slope surface and inside at different time points, the overall deformation trend and local deformation characteristics of the slope can be evaluated.

[0136] Plastic damage refers to permanent damage caused by the expansion and penetration of internal microcracks in the process of rock stress. Under freeze-thaw cycles, the mechanical properties of rocks change, and plastic damage becomes more significant. By analyzing the distribution range, expansion speed and damage degree of the plastic zone, we can understand the development of internal damage in the rock slope of the mine.

[0137] The mine safety factor is a quantitative indicator based on slope stability analysis. It is used to evaluate the safety of mine rock slopes under specific conditions. It takes into account the combined influence of multiple factors such as slope geometry, rock mechanical properties, external loads, etc. The safety factor is calculated or adjusted under freeze-thaw cycles to reflect changes in slope stability.

[0138] Stress distribution is one of the key factors in evaluating slope stability. By obtaining stress distribution data inside the slope through numerical simulation and on-site monitoring, we can understand information such as stress concentration areas, principal stress directions and magnitudes. The redistribution and changes of stress under freeze-thaw cycles have an important impact on the stability of rock slopes in mines.

[0139] Then, the stability of the mine rock slope is evaluated by combining the different damage analysis results of the above-mentioned mine rock slope and the rock freeze-thaw test information.

[0140] 1. Construction of comprehensive damage analysis results. First, a number of key damage analysis factors were integrated, including but not limited to displacement changes, plastic damage development, the change trend of mine safety factor and the change law of stress distribution, to analyze the damage state of mine rock slopes under different freeze-thaw cycles. The above analysis factors are interrelated and jointly affect the response mechanism and changes of mine rock slopes under freeze-thaw action.

[0141] 2. Analysis and explanation of damage analysis results. The displacement change characteristics record in detail the displacement data of the mine rock slope in different freeze-thaw cycles. Through comparative analysis, the displacement change trend with the increase of freeze-thaw times is clarified, including but not limited to the displacement rate, the cumulative effect of displacement amount and the relationship between local and overall displacement.

[0142] The development of plastic damage can be studied by using numerical simulation and field monitoring data to identify the formation, expansion path and damage degree of the plastic zone inside the rock slope of the mine, and then the impact of freeze-thaw cycles on the microstructure of the rock and the effect of different influencing factors on the development of macroscopic plastic damage can be obtained.

[0143] Based on the latest mechanical models and calculation methods, the changing trend of mine safety factors can be obtained, which can directly evaluate the safety factors of mine rock slopes under different freeze-thaw cycles. By comparing the safety factor values ​​under different numbers of freeze-thaw cycles, the law of changes in safety factors with increasing numbers of freeze-thaw cycles can be obtained.

[0144] The changing law of stress distribution conditions, by analyzing the dynamic changes of the stress field, the location of the stress concentration area of ​​the mine rock slope under the freeze-thaw cycle, the change of the principal stress direction and the fluctuation of the stress level are analyzed. The above changes provide an analytical basis for understanding the stability of the mine rock slope under the action of freeze-thaw cycles.

[0145] 3. Evaluate and verify stability. Based on the above damage analysis results and combined with rock freeze-thaw test information, a comprehensive evaluation of the stability of the mine rock slope was conducted. The rock freeze-thaw test information provides direct information on the changes in the mechanical properties of rocks under freeze-thaw cycles, which enhances the scientificity and reliability of the evaluation results.

[0146] Furthermore, in order to verify the accuracy of the analysis results of mine rock slope damage, the analysis results were compared with the historical test data of rock freeze-thaw. By comparing the similarities and differences between the two, the rationality of the analysis method and the accuracy of the analysis results were verified.

[0147] 4. Comprehensive evaluation and reinforcement scheme design for the rock slopes of the mine. Based on the comparative analysis results, the stability of the rock slopes of the mine was comprehensively evaluated by comprehensively considering multiple factors such as displacement changes, plastic damage, mine safety factors and stress distribution. Then, the main problems and potential safety risks of the rock slopes of the mine were analyzed, and corresponding reinforcement measures or improvement suggestions were proposed. Then, the reinforcement scheme of the rock slopes of the mine was designed, which will help to ensure the stability of the rock slopes of the mine, reduce potential rock safety risks, and ensure the smooth progress of mine production activities. The reinforcement scheme includes but is not limited to adding support structures, improving drainage systems, adjusting mining plans, etc. The specific reinforcement measures also depend on the actual situation and evaluation results of the rock slopes of the mine.

[0148] The present invention analyzes the influence of ambient temperature fluctuations on mine rock slopes under the action of freeze-thaw cycles, reveals the deformation evolution law, damage accumulation process and changing trend of stress state of mine rock slopes under variable climatic conditions, and then conducts a comprehensive and in-depth analysis and evaluation of the stability of rock slopes within the mining area, which not only enhances the understanding of the safety of mine slopes under extreme climatic conditions, but also provides a scientific basis and technical support for the design of mine rock slopes.

[0149] See also Figure 8 In an optional embodiment, in order to efficiently execute the mine rock slope freeze-thaw damage analysis method provided by the present invention, the present invention also provides a mine rock slope freeze-thaw damage analysis system, in which the input device, processor, output device and memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the specific steps of the relevant embodiments of the mine rock slope freeze-thaw damage analysis method provided by the present invention. The mine rock slope freeze-thaw damage analysis system of the present invention has a complete structure, objective stability, and can efficiently execute the mine rock slope freeze-thaw damage analysis method of the present invention, thereby improving the overall applicability and practical application ability of the present invention.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for analyzing freeze-thaw damage of a mine rock slope, characterized in that: The steps include: Selecting a mine rock slope sample, performing a freeze-thaw cycle test on the mine rock slope sample, and obtaining rock freeze-thaw test information; Setting a displacement analysis index according to the rock freeze-thaw test information, and obtaining the displacement change of the rock slope under the freeze-thaw cycle based on the displacement analysis index; Based on the rock freeze-thaw test information, the plastic damage of the rock slope and the safety factor of the mine under freeze-thaw cycles are analyzed; Establishing a stress analysis model based on the rock freeze-thaw test information, and obtaining the stress distribution of the rock slope under freeze-thaw cycles through the stress analysis model; Analyze the damage results of the mine rock slope under the freeze-thaw cycle in combination with the displacement change, the plastic damage, the mine safety factor and the stress distribution; The displacement analysis index is set according to the rock freeze-thaw test information, including: Setting a first analysis index according to the rock freeze-thaw test information, wherein the first analysis index includes a rock mass loss rate; Setting a second analysis index according to the rock freeze-thaw test information, wherein the second analysis index includes rock porosity; The displacement change of the rock slope under freeze-thaw cycles obtained based on the displacement analysis index includes: Analyzing the displacement change of the rock slope under freeze-thaw cycles in combination with the rock mass loss rate, the rock porosity and the rock freeze-thaw test information; The rock mass loss rate satisfies the following relationship: ， in, represents the mass loss rate of rock, represents the mass of the rock in the initial dry state, express The quality of the rock in the dry state after the first freeze-thaw; The rock porosity satisfies the following relationship: ， in, The porosity of the rock. express The saturated mass of rock after the first freeze-thaw express The quality of the rock in the dry state after the first freeze-thaw. represents the density of water, Indicates the height of the rock. represents the cross-sectional area of ​​the rock; The analysis of the plastic damage of the rock slope and the mine safety factor under the freeze-thaw cycle based on the rock freeze-thaw test information includes: Establishing a safety factor prediction model based on the plastic damage conditions and the rock freeze-thaw test information; The safety factor prediction model satisfies the following relationship: ， in, represents the safety factor of the rock slope, Indicates the freezing depth of the rock slope, Indicates the length of the rock slope; The establishing of the stress analysis model according to the rock freeze-thaw test information comprises: Constructing a shear stress analysis model based on the rock freeze-thaw test information; Constructing a principal stress analysis model based on the rock freeze-thaw test information and the shear stress analysis model; A stress analysis model is obtained based on the shear stress analysis model and the principal stress analysis model.

2. The freeze-thaw damage analysis method for mine rock slope according to claim 1 is characterized in that: The freeze-thaw cycle test is performed on the rock slope sample of the mine, and the rock freeze-thaw test information is obtained, including: Based on the characteristics of the mine rock slope samples, the freeze-thaw temperature range, freeze-thaw cycle time and number of freeze-thaw cycles were set; A freeze-thaw cycle test is performed on a mine rock slope sample according to the freeze-thaw temperature range, the freeze-thaw cycle time and the freeze-thaw cycle number, and rock freeze-thaw test information is obtained.

3. The freeze-thaw damage analysis method for mine rock slope according to claim 1 is characterized in that: The shear stress analysis model satisfies the following relationship: ， in, is the shear stress of the rock, is the load on the rock, Indicates the angle between the rock and the horizontal ground ， represents the friction coefficient of the shear force measuring roller, Represents the cross-sectional area of ​​the rock.

4. The method for analyzing freeze-thaw damage of a mine rock slope according to claim 1, characterized in that: The principal stress analysis model satisfies the following relationship: ， in, represents the maximum principal stress, represents the uniaxial compressive strength of rock, represents the confining pressure correlation coefficient, represents the minimum principal stress, The cohesive force of the rock. Represents the internal friction angle of the rock.

5. The freeze-thaw damage analysis method for mine rock slope according to claim 1, characterized in that: The damage results of the mine rock slope under freeze-thaw cycles analyzed by combining the displacement change, the plastic damage, the mine safety factor and the stress distribution include: Setting damage analysis factors of the mine rock slope under freeze-thaw cycles and obtaining damage analysis results, wherein the damage analysis factors include the displacement change, the plastic damage, the mine safety factor and the stress distribution; The stability of the mine rock slope is evaluated by combining the damage analysis results with the rock freeze-thaw test information.

6. A freeze-thaw damage analysis system for rock slopes in mines, characterized in that: The system includes a processor, an input device, an output device and a memory, wherein the processor, the input device, the output device and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the freeze-thaw damage analysis method for a mine rock slope as described in any one of claims 1 to 5.

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