Freeze-thaw damage analysis method and system for mine rock slopes

Abstract

The present invention relates to the technical field of mine rock slope analysis, and in particular to a freeze-thaw damage analysis method and system for mine rock slopes. The method comprises 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; on the basis of the rock freeze-thaw test information, setting displacement analysis indices, and on the basis of the displacement analysis indices, obtaining displacement variations of rock slopes under freeze-thaw cycles; on the basis of the rock freeze-thaw test information, analyzing plastic damage conditions and mine safety coefficients of the rock slopes under the freeze-thaw cycles; on the basis of the rock freeze-thaw test information, establishing a stress analysis model, and by means of the stress analysis model, obtaining stress distribution conditions of the rock slopes under the freeze-thaw cycles; and by combining the displacement variations, the plastic damage conditions, the mine safety coefficients and the stress distribution conditions, analyzing damage results of the mine rock slopes. In the present invention, multi-objective analysis of freeze-thaw damage conditions of mine rock slopes is performed, thereby ensuring the stability of the rock slopes.

Description

A method and system for analyzing freeze-thaw damage of mine rock slopes Technical Field

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

[0002] During freeze-thaw cycles, the freezing and melting of water in rock pores causes the rock's volume to expand and contract, which in turn triggers the expansion and penetration of microcracks within the rock, ultimately leading to the degradation of the rock's macroscopic mechanical properties. This process involves complex physical, chemical, and mechanical interactions, including the formation and disappearance of ice crystals, changes in pore water pressure, and alterations in the rock's internal microstructure.

[0003] The dynamic development of open-pit mine slopes in cold regions is significantly influenced by seasonal temperature fluctuations. Slope morphology exhibits a cycle of winter freezing and spring thawing in response to periodic temperature fluctuations. Different rock slopes, exposed for varying periods of time, experience varying degrees of freeze-thaw damage. This freeze-thaw interaction significantly impacts slope stability, leading to geological hazards such as landslides and collapses on mine rock slopes. Technical issues

[0004] Under complex and changeable geological conditions, existing analysis methods for freeze-thaw damage to rock slopes ignore the mutual influence between the changes in rock microstructure and macroscopic mechanical properties during the freeze-thaw process, and it is difficult to capture the changing state of slope soil under the action of freeze-thaw. Therefore, 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. Technical Solutions

[0005] In response to 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 freeze-thaw damage analysis method for mine rock slopes, which includes the following steps: selecting mine rock slope samples, conducting freeze-thaw cycle tests on the mine rock slope samples, and obtaining rock freeze-thaw test information; setting displacement analysis indicators based on the rock freeze-thaw test information, and obtaining the displacement change 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 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 mine rock slope under freeze-thaw cycles in combination with the displacement change, the plastic damage, the mine safety factor, 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, performing a freeze-thaw cycle test on the mine rock slope sample and obtaining rock freeze-thaw test information includes: setting a freeze-thaw temperature range, a freeze-thaw cycle time, and a number of freeze-thaw cycles based on characteristics of the mine rock slope sample; and performing a freeze-thaw cycle test on the mine rock slope sample according to the freeze-thaw temperature range, the freeze-thaw cycle time, and the number of freeze-thaw cycles, 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 freeze-thaw conditions, making the test data more closely aligned with the actual environment, thereby improving the pertinence and accuracy of the test results.

[0007] Optionally, setting displacement analysis indicators based on the rock freeze-thaw test information includes: setting a first analysis indicator based on the rock freeze-thaw test information, the first analysis indicator including the rock mass loss rate; and setting a second analysis indicator based on the rock freeze-thaw test information, the second analysis indicator including the rock porosity. The present invention, through the analysis indicators set, can quantitatively assess the degree of damage and microstructural changes of rocks during freeze-thaw cycles, providing a reliable basis for slope stability analysis. Combining multiple analysis indicators can provide a more comprehensive understanding of rock changes under freeze-thaw conditions, providing a comprehensive basis for judgment in 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, The present invention quantifies and predicts the results of different efficacy evaluation factors based on a mathematical model. By combining the corresponding parameters, correlation coefficients, and cancer efficacy information of different efficacy evaluation factors, the predicted results of each efficacy evaluation factor can be accurately calculated.

[0015] Optionally, the 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 includes: establishing a safety factor prediction model based on the plastic damage 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, The present invention uses a safety factor prediction model to quantify the stability risk of a rock slope under freeze-thaw cycles into a specific value, allowing for an intuitive understanding of the slope's safety status.

[0019] Optionally, establishing 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 utilizes a stress analysis model to accurately predict the mechanical behavior of rock under freeze-thaw cycles, thereby facilitating accurate analysis of freeze-thaw damage to rock.

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

[0021]

[0022] in, represents the shear stress of the rock, is the load on the rock, represents the angle between the rock and the horizontal ground, represents the friction coefficient of the shear force measurement 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, Represents 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, analyzing the damage results of the mine rock slope under freeze-thaw cycles in combination with the displacement change, the plastic damage, the mine safety factor, and the stress distribution includes: setting damage analysis factors for 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; and evaluating the stability of the mine rock slope 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, and can more comprehensively evaluate the damage of the mine rock slope under freeze-thaw cycles, more accurately reflect the actual state of the slope, and avoid assessment bias caused by a single factor.

[0027] In a second aspect, in order to efficiently execute the freeze-thaw damage analysis method for a mine rock slope provided by the present invention, the present invention also provides a freeze-thaw damage analysis system for a mine rock slope, comprising a processor, an input device, an output device, and a memory, wherein the processor, input device, output device, and memory are interconnected, wherein the memory is used to store a computer program, the computer program including 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 the first aspect of the present invention. The freeze-thaw damage analysis system for a mine rock slope of the present invention has a compact structure and stable performance, and can stably execute the freeze-thaw damage analysis method for a mine rock slope provided by the present invention, thereby improving the overall applicability and practical application capabilities of the present invention. Beneficial effects

[0028] To address the shortcomings of existing methods and meet the needs of practical applications, this paper comprehensively evaluates the damage outcomes of rock slopes in mines subjected to freeze-thaw cycles by combining displacement changes, plastic damage, mine safety factors, and stress distribution. This provides a scientific basis for mine slope management measures and disaster prevention and mitigation programs. Based on experimental data, this paper analyzes factors such as displacement, plasticity, safety index, and stress of rock slopes subjected to freeze-thaw cycles, helping to comprehensively and accurately reflect the damage and stability of rock slopes under freeze-thaw cycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a flow chart of a method for analyzing freeze-thaw damage of a mine rock slope according to the present invention;

[0030] FIG2 is a schematic diagram of the mass loss change of a rock slope under freeze-thaw cycles according to the present invention;

[0031] FIG3 is a schematic diagram of porosity changes in rock slopes under freeze-thaw cycles according to the present invention;

[0032] FIG4 is a schematic diagram of displacement changes of a rock slope under freeze-thaw cycles according to the present invention;

[0033] FIG5 is a schematic diagram of the plastic damage of a rock slope under freeze-thaw cycles according to the present invention;

[0034] FIG6 is a schematic diagram of a safety factor curve of a rock slope according to the present invention;

[0035] FIG7 is a schematic diagram of the relationship between maximum principal stress and time in a rock slope under freeze-thaw cycles according to the present invention;

[0036] FIG8 is a structural diagram of the mine rock slope freeze-thaw damage analysis system of the present invention. DETAILED DESCRIPTION

[0037] The freeze-thaw damage analysis method and system for a mine rock slope described in the present invention have been disclosed in CN119066884A.

[0038] Referring to Figure 1, the present invention systematically analyzes key factors such as displacement changes, plastic damage, safety index, and stress distribution of rock slopes in mines under freeze-thaw cycles. This not only significantly enhances the understanding of the damage mechanism of rock slopes under freeze-thaw environments, but also provides strong technical support for achieving comprehensive and accurate assessment of slope stability. The present invention provides a freeze-thaw damage analysis method for rock slopes in mines, which includes the following steps:

[0039] S1. Select a mine rock slope sample, conduct a freeze-thaw cycle test on the mine rock slope sample, and obtain rock freeze-thaw test information. The specific implementation steps and contents are as follows;

[0040] First, 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. The specific contents are as follows;

[0041] 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 mine rock slopes in a natural environment.

[0042] During the test, it is necessary not only to observe the signs of damage on the rock surface under different freeze-thaw cycles, such as crack expansion 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.

[0043] Different rock samples have different physical and mechanical properties and microstructural characteristics, and the above characteristics also respond differently to freeze-thaw cycles. Therefore, it is necessary to set freeze-thaw conditions that match the sample characteristics, which is conducive to more accurate assessment 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.

[0044] 1. Set and select the freeze-thaw temperature range.

[0045] Based on the historical meteorological data of the area where the mine rock slope samples are located, the temperature fluctuations throughout the year, the monthly minimum and maximum temperatures, and the extreme temperature conditions in the sample area 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.

[0046] 2. Set the freeze-thaw cycle time.

[0047] Based on 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 phase and an 8-hour melting phase based on the freezing period information embodiment. The entire 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.

[0048] 3. Set the number of freeze-thaw cycles.

[0049] After comprehensively analyzing the actual daily freeze-thaw cycles experienced by the areas where the mine rock slope samples were located, as well as the specific laboratory conditions, 30 freeze-thaw cycles were selected as the maximum number of freeze-thaw cycles in the examples. This number of freeze-thaw cycles takes into account the potential long-term freeze-thaw cycle effects that the mine rock slope samples may experience, while also balancing the operability and stability of the results under laboratory conditions. By simulating 30 freeze-thaw cycles, the changes in the physical and mechanical properties of the mine rock slopes under repeated freeze-thaw cycles and their impact on slope stability can be fully revealed.

[0050] 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 the freeze-thaw test conditions according to specific experimental objectives can more accurately simulate the natural environment experienced by the rocks in the target area and reduce uncertainties in the test process.

[0051] Then, according to the above freeze-thaw temperature range, freeze-thaw cycle time and freeze-thaw cycle number, a freeze-thaw cycle test was carried out on the mine rock slope samples, and the rock freeze-thaw test information was obtained, the specific content of which is as follows;

[0052] The initial mass and ultrasonic velocity of mining rock slope samples were systematically measured. Subsequently, different numbers of freeze-thaw cycles (5, 10, 20, and 30) were applied, and the changes in mass and ultrasonic velocity after each cycle were recorded. Curves were plotted showing the relationship between mass change and the number of freeze-thaw cycles, as well as the change in ultrasonic velocity with the number of freeze-thaw cycles. This allowed for an in-depth analysis of the evolution of relevant physical properties during the freeze-thaw process. Furthermore, close attention was paid to damage to the mining rock slope samples, such as cracking and spalling, and the number of freeze-thaw cycles at which these phenomena first occurred was carefully recorded to aid in assessing the stability of the rock slope. Furthermore, thermal conductivity measurements were performed on the mining rock slope samples, with the thermal conductivity measured and recorded after 5, 10, 20, and 30 freeze-thaw cycles. Curves of thermal conductivity versus freeze-thaw cycles were also plotted to analyze the patterns of change and their impact on the test results.

[0053] 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 is 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.

[0054] In an optional embodiment, the mine rock slope samples of group A are placed in an electric constant temperature blast drying oven for thorough drying; the mine rock slope samples of group B serve 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 the free immersion method to ensure that the rock is fully saturated with water to reach a predetermined moisture content state.

[0055] 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. The relevant data were recorded in detail as the basis for subsequent comparative analysis.

[0056] Groups A and C were selected and subjected to uniaxial compression testing in their initial state using a universal materials testing machine. During this process, the stress-strain relationship and uniaxial compressive strength of the specimens were closely monitored and recorded to assess their initial mechanical properties.

[0057] The three test blocks, Groups A, B, and C, were placed in a horizontal ultra-low temperature test chamber and subjected to rigorous freeze-thaw cycles. Each cycle consisted of 16 hours of freezing (at ultra-low temperatures) followed by 8 hours of thawing (at 20°C) in a constant temperature chamber, for a total of 24 hours. The entire test process was repeated 30 times to simulate the long-term freeze-thaw effects of natural mining rock edges.

[0058] 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; and Group C was immersed in pure water for 24 hours, then quickly wiped dry with a dry towel before measurement.

[0059] Further tests were conducted on the mine rock slope samples after freeze-thaw cycles. After a specific number of freeze-thaw cycles (5th, 10th, 20th and 30th times), 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 impact of freeze-thaw cycles on the performance of mine rock slope samples and their changing patterns.

[0060] In this embodiment, freeze-thaw conditions that match the sample characteristics include but are not limited to temperature ranges, cycle time and number of cycles. This can more accurately simulate the freeze-thaw process experienced by rocks in actual environments, thereby more accurately evaluating the damage of rocks under freeze-thaw cycles. During the experiment, key parameter information of 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 rock damage-related analysis models later, and predicts the stability change trend of rocks under long-term freeze-thaw effects.

[0061] Furthermore, the method of obtaining rock freeze-thaw test information in this embodiment is only an optional condition of the present invention. In other embodiments, the method of 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.

[0062] S2. Set displacement analysis indicators based on rock freeze-thaw test information, and obtain the displacement changes of the rock slope under freeze-thaw cycles based on the displacement analysis indicators. The specific implementation steps and contents are as follows;

[0063] To comprehensively and scientifically evaluate the displacement of rock slopes under freeze-thaw cycles, a displacement analysis system was designed based on rock freeze-thaw test information. This 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.

[0064] In the examples, the rock mass loss rate was used as the first analytical indicator. After five, 10, 20, and 30 freeze-thaw cycles, the difference between the dry mass and the initial dry mass of rock slope samples from different mines was analyzed as a percentage of the initial mass. This not only effectively quantified the mass loss of rock slope samples during the freeze-thaw process, but also reduced the analytical error caused by initial mass differences, providing solid data support for subsequent displacement analysis.

[0065] The above rock mass loss rate satisfies the following relationship:

[0066]

[0067] 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;

[0068] The mass loss rate refers to the percentage of the difference between the mass of a mine rock slope in a dry state and the initial dry mass after a specific number of freeze-thaw cycles. It can then be used to 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.

[0069] The second analysis index is set based on 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.

[0070] During freeze-thaw cycles, changes in porosity are one of the most important macroscopic manifestations of physical property degradation. Measuring the porosity of rocks after different freeze-thaw cycles can be used as a basis for analyzing freeze-thaw damage in rock slopes.

[0071] The rock porosity satisfies the following relationship:

[0072]

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Rock porosity reflects the proportion of the rock's internal pore volume to its total volume. With increasing freeze-thaw cycles, tiny cracks and pores within the rock may gradually expand, leading to an increase in porosity. These changes not only affect the rock's physical properties, such as permeability and water absorption, but also its mechanical properties and stability.

[0077] 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 content is as follows;

[0078] Under constant stress level conditions, with the continuous increase in the number of freeze-thaw cycles, the mass loss rate also shows a significant upward trend. This trend can be characterized by monitoring the power function model. Please see Figure 2 for details. 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 results of the embodiment are indeed highly reliable, further verifying the effectiveness and accuracy of the rock mass loss rate model.

[0079] Furthermore, based on the rock mass loss rate analysis results and image information, it can be seen that, given the same number of freeze-thaw cycles, the stress level experienced during the freeze-thaw process significantly affects the rock mass loss rate. Specifically, as the stress level increases, the damage sustained by the rock during the freeze-thaw process becomes more severe, leading to a greater mass loss rate. This indicates that stress level is one of the key factors regulating the extent of freeze-thaw damage to rocks, and its changes can directly affect the stability and integrity of the rock's internal structure.

[0080] To analyze the porosity variation trends and physical mechanisms of frozen-thaw slope samples, see Figure 3. It visually demonstrates the porosity variation with increasing freeze-thaw cycles at different stress levels, revealing the impact of freeze-thaw cycles on the rock's internal microstructure. At the same stress level, rock porosity increases with increasing freeze-thaw cycles. The freeze-thaw process causes the freeze-expansion of pore water within the rock, coupled with its migration under the influence of temperature gradients, leading to rock destruction, development, and interconnection. This in turn promotes an increase in the number of cracks and a more complex pore structure.

[0081] When the ultimate compressive strength was applied to the slope samples and freeze-thaw cycles, the porosity growth rate slowed compared to the unloaded freeze-thaw condition. This indicates that appropriate loading can, to a certain extent, inhibit the destructive effects of the freezing process on the rock pore walls, offsetting some of the destructive effects caused by ice expansion by enhancing the stress state within the rock. Furthermore, during the thawing process, low-level loading may also promote the compaction of pores and cracks within the rock, further limiting porosity growth.

[0082] However, as the load level continues to increase during the freeze-thaw process, the growth rate of rock porosity actually increases, 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 based on 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, ultimately leading to a significant increase in the porosity of the mine rock slope.

[0083] The displacement changes of rock slopes under freeze-thaw cycles were obtained based on rock mass loss rate and rock porosity, as follows;

[0084] The change in displacement of a rock slope directly reflects the gradual deformation and failure of the slope as the freeze-thaw cycle progresses. As shown in Figure 4, the slope's inherent gravity field, as an inherent driving force, plays a dominant role in the displacement change, exacerbating the development of rock slope displacement. To more comprehensively assess the impact of freeze-thaw cycles on slope stability, the examples incorporate the rock mass loss rate, which directly reflects the degree of rock loss due to freeze-thaw cycles. This allows for a quantitative analysis of the contribution and mechanism of rock mass change to slope displacement.

[0085] The displacement change diagram shown in Figure 4 can analyze the displacement change characteristics of the mine rock slope samples under different freeze-thaw stages. Based on the diagram, it can be seen that after five freeze-thaw cycles, the overall displacement of the mine rock slope has not shown significant changes, indicating that in the initial stage, the impact of freeze-thaw on slope stability is relatively mild. However, as the number of freeze-thaw cycles continues to accumulate, the mine rock slope begins 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 local areas of the mine rock slope have been affected by freeze-thaw.

[0086] As the number of freeze-thaw cycles increases, reaching 20 or even 30, the displacement changes in the mine rock slope become increasingly severe. The impact of freeze-thaw on the internal structure of the slope is continuous, cumulative, and progressive. With the repeated freezing and thawing of water, microcracks within the rock gradually expand, the pore structure undergoes significant changes, and the porosity increases, which in turn weakens the overall strength, stiffness, and stability of the rock.

[0087] Increased porosity not only directly reduces the effective bearing area of ​​rock slopes but also promotes the infiltration and retention of water over a wider area, further exacerbating the range and intensity of frost heave and thaw settlement effects within the rock. The coupled physical-mechanical processes described above cause significant displacement and deformation of the slope under freeze-thaw cycles, which in one optional embodiment can manifest as subsidence, lateral movement, and even partial collapse of the slope surface. Observing and analyzing the displacement changes of rock slopes under freeze-thaw cycles based on changes in rock porosity not only helps to deepen our understanding of the physical basis of slope stability degradation but also provides a scientific basis for developing effective slope protection and reinforcement measures.

[0088] Furthermore, in this embodiment, the analysis method of 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.

[0089] S3. Analyze the plastic damage of rock slopes and the safety factor of mines under freeze-thaw cycles based on the rock freeze-thaw test information. The specific implementation steps and contents are as follows:

[0090] In an optional embodiment, the plastic damage of the rock slope under freeze-thaw cycles is analyzed based on rock freeze-thaw test information.

[0091] 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. Please refer to Figure 5, which marks the action time corresponding to different numbers of freeze-thaw cycles, mainly including 120 hours, 240 hours, 480 hours and 720 hours.

[0092] Based on the plastic damage diagram shown in Figure 5, it can be seen that the damage evolution trajectory of the rock slope at 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 freeze-thaw cycles (240 hours), 20 freeze-thaw cycles (480 hours), and even 30 freeze-thaw cycles (720 hours), 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.

[0093] After 10 freeze-thaw cycles, the surface of the rock slope, especially the toe and shallow parallel slope areas, 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 expansion pattern shows 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 surface spreads in a direction parallel to the slope surface. The above 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.

[0094] Plastic damage to rock slopes under freeze-thaw cycles is a complex and dynamic process involving the interaction and influence of multiple factors, which can be intuitively demonstrated through the quantitative analysis of equivalent plastic strain. This 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.

[0095] A safety factor prediction model is established based on the above plastic damage conditions and rock freeze-thaw test information;

[0096] The above safety factor prediction model satisfies the following relationship:

[0097]

[0098] in, represents the safety factor of the rock slope, Indicates the freezing depth of the rock slope, Indicates the length of the rock slope.

[0099] Based on this plastic damage scenario, a rock freeze-thaw safety factor prediction model was established. The parameters in this model are correlated with the actual slope state and freeze-thaw effects. The rock slope safety factor can be directly used as a key indicator for slope stability. The freezing depth of a rock slope reflects the depth of the impact of freeze-thaw cycles on the slope's internal structure. Taking into account the overall slope shape and boundary conditions, the length of a rock slope can affect its stability.

[0100] 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.

[0101] The safety factor data was analyzed to explore the potential relationship between freezing depth, slope length, and the safety factor. A portion of the data was used as a training set to fit the model parameters, and the remaining data was used as a test set to verify the model's accuracy and generalization capabilities. Based on the verification results, the model parameters were adjusted to improve the model's predictive accuracy. The adjusted model was then applied to actual engineering problems and further optimized based on the feedback. As the plastic damage condition changes, the shape and depth of the rock slope's sliding surface also change, making the slope more prone to shallow landslides and reducing its overall safety and stability. See Figure 6 for the changes in the safety factor.

[0102] Furthermore, in this embodiment, the safety factor analysis method of the rock slope under freeze-thaw cycles is only an optional condition of this 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 this embodiment is flexible and adjustable, which enhances the adaptability and practicality of the method of the present invention.

[0103] S4. Establish a stress analysis model based on the rock freeze-thaw test information, and use the stress analysis model to obtain the stress distribution of the rock slope under freeze-thaw cycles. The specific implementation steps and contents are as follows:

[0104] Based on the information from rock freeze-thaw tests, the shear stress evolution data of the rock slope during a complete freeze-thaw cycle was obtained, and then the impact mechanism of the freeze-thaw cycle on the stability of the rock slope was analyzed. As the freeze-thaw cycle progressed, the mechanical behavior of the slope showed obvious stage characteristics.

[0105] In the early stages of the freeze-thaw cycle, as temperatures drop, frost damage begins to appear on the rock slope surface, causing degradation of the slope's physical and mechanical properties. This process significantly increases shear stress on the slope surface, particularly in the geometrically weak area at the junction of the steep and gentle slope toe, where significant stress concentration occurs. This phenomenon indicates that the slope is about to deform and become unstable, and that the rock toe is the starting point for damage.

[0106] In the middle stage, the freeze-thaw cycle is followed by thawing and stress release. As the freeze-thaw cycle progresses, the external temperature gradually rises, and the frozen water in the cracks inside the rock mass begins to melt. This 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. However, it may also cause new hydrogeological problems, such as increased seepage.

[0107] The later stages are accompanied by refreezing and stress rebuilding. When the freeze-thaw cycle enters the next low-temperature stage, the external ambient temperature drops again, and the water in the cracks inside the slope refreezes. The frost heave of the ice generates additional frost heave force, further exacerbating the stress state inside the rock slope. At this time, the slope shear stress gradually increases again as the temperature drops, indicating that the stability of the rock slope will continue to deteriorate.

[0108] Rock slopes undergo a repetitive freeze-thaw cycle, undergoing a complete process of initial freeze damage, mid-term thawing, and final refreezing. This process continuously degrades the mechanical properties of the rock mass, causing shear stresses to repeatedly concentrate and release in weak areas like the slope toe. Ultimately, under the influence of repeated frost heave forces, the rock mass gradually accumulates damage, ultimately leading to deformation and failure.

[0109] 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:

[0110]

[0111] in, represents the shear stress of the rock, is the load on the rock, represents the angle between the rock and the horizontal ground, represents the friction coefficient of the shear force measurement roller, Represents the cross-sectional area of ​​the rock.

[0112] Rock loads refer to various external forces or actions that can cause stress, strain, or displacement within the rock. These loads can be natural or human-induced, and include, but are not limited to, deadweight stress, tectonic stress, engineering loads, and seismic loads. These loads act collectively on the rock mass, influencing its stability, deformation behavior, and failure modes. In rock engineering design and construction, these loads directly impact the safety and stability of the project.

[0113] The angle between the rock and the horizontal ground refers to the angle between the reference plane in the rock and the horizontal plane. It helps to understand the inclination and stability of the mine rock slope in this embodiment and provides a reference for subsequent damage analysis of the mine rock slope.

[0114] 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 during the shear force measurement and the normal pressure on the roller. The above ratio is a dimensionless physical quantity that can be used to describe the friction characteristics of the roller under specific conditions.

[0115] Based on the rock freeze-thaw test information, a curve image of the maximum principal stress of the rock slope under freeze-thaw cycles and time is drawn. Please refer to Figure 7 for further analysis of the stress distribution of the rock slope under freeze-thaw cycles.

[0116] 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 impact 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.

[0117] 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 action 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.

[0118] In another optional embodiment, the impact of freeze-thaw cycles on the stability of rock slopes is analyzed. Under the dynamic effects of freeze-thaw cycles, the stability of the slope becomes more complex. Based on the displacement changes, it can be seen that due to the stress concentration and abundant cracks at the toe of the slope, this area becomes the most sensitive and intense area to freeze-thaw effects. As the freeze-thaw cycle continues, the maximum principal stress fluctuation amplitude at the toe 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 cracks. Combined with the plastic damage analysis information of the slope under freeze-thaw effects, it can be seen that the deformation damage of the rock slope starts from the toe of the slope and gradually expands upward. This is of great significance for understanding the instability mechanism of the slope under freeze-thaw conditions, evaluating the long-term stability of the rock slope, and formulating effective protective measures.

[0119] 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:

[0120]

[0121] 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.

[0122] 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. It can be tensile stress or compressive stress, depending on the stress conditions and stress state of the rock.

[0123] 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 an axial force under unconfined conditions, that is, the ratio of the maximum load at the time of destruction of the mine rock slope sample 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.

[0124]

[0125] in, represents the uniaxial compressive strength of rock, represents the failure load of rock, Represents the cross-sectional area of ​​the rock. Determining the uniaxial compressive strength of rock can provide a scientific basis for engineering design and construction, further ensuring the safety and stability of the project.

[0126] In rock mechanics or geological engineering experiments, 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.

[0127] The minimum principal stress of a rock slope refers to the minimum stress value among 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.

[0128] 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.

[0129] The internal friction angle of a rock is a quantitative indicator of the relationship between the normal stress and internal friction on the shear plane during shear failure. It reflects the resistance generated by friction between particles within the rock. The internal friction angle of a rock is also an important parameter for describing its shear strength. Its magnitude is influenced by various factors, including the rock's physical properties and structural characteristics. In practical applications, the internal friction angle of a rock must be measured and analyzed based on specific circumstances.

[0130] In order to comprehensively analyze the stress distribution of the rock slope in the embodiment, the shear stress analysis results and the principal stress analysis structure are combined.

[0131] 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.

[0132] 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, the direction and magnitude of the principal stress will change due to the redistribution of stress, especially in the area close to the free surface.

[0133] Based on the analysis results of shear stress and principal stress, the distribution of slope stress is analyzed. In particular, the shear stress concentration area and the changes in the principal stress direction are analyzed. At the same time, the stress distribution is adjusted and verified in combination with the geometric shape of the rock slope and external environmental conditions.

[0134] Furthermore, the analysis method of the slope stress distribution condition in this embodiment is only an optional condition of this embodiment. In one or some other embodiments, the stress analysis method can be optimized according to the actual situation and stress distribution properties of the rock slope, which can more accurately reflect the stress state of the rock slope, thereby improving the comprehensiveness and accuracy of the analysis results.

[0135] S5. Analyze the damage results of the mine rock slope under freeze-thaw cycles by combining the displacement change, plastic damage, mine safety factor and stress distribution. The specific implementation steps and contents are as follows:

[0136] In this embodiment, damage analysis factors of a mine rock slope under freeze-thaw cycles are set, and damage analysis results are obtained. The damage analysis factors mainly include displacement change, plastic damage, mine safety factor, and stress distribution.

[0137] Displacement changes are a key indicator of the degree of deformation in rock slopes in mining areas. Under freeze-thaw cycles, rock expands and contracts due to temperature fluctuations, causing slope displacement. By analyzing displacement data at key points on the slope surface and within it at different time points, we can assess the overall deformation trend and local deformation characteristics of the slope.

[0138] Plastic damage refers to permanent damage to rock caused by the expansion and penetration of internal microcracks during stress. During freeze-thaw cycles, the mechanical properties of rock change, making plastic damage more pronounced. By analyzing the distribution, expansion rate, and damage severity of the plastic zone, we can understand the progression of internal damage in mining rock slopes.

[0139] 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.

[0140] Stress distribution is a key factor in assessing slope stability. Obtaining stress distribution data within slopes through numerical simulations and field monitoring can reveal information such as stress concentration areas, principal stress directions, and magnitudes. The redistribution and changes in stress during freeze-thaw cycles significantly impact the stability of rock slopes in mining areas.

[0141] Then, the stability of the mine rock slope is evaluated by combining the different damage analysis results of the mine rock slope and the rock freeze-thaw test information.

[0142] 1. Construction of Comprehensive Damage Analysis Results. First, we integrated multiple key damage analysis factors, including but not limited to displacement changes, plastic damage development, trends in the mine safety factor, and stress distribution patterns, to analyze the damage state of the mine rock slope under different freeze-thaw cycles. These factors are interrelated and jointly influence the response mechanism and changes of the mine rock slope under freeze-thaw cycles.

[0143] 2. Analysis and interpretation of damage analysis results. The displacement variation characteristics record the displacement data of the mine rock slope in different freeze-thaw cycles in detail. Through comparative analysis, the displacement variation trend with the increase of freeze-thaw number is clarified, including but not limited to the displacement rate, the cumulative effect of displacement, and the relationship between local and global displacement.

[0144] 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.

[0145] Based on the latest mechanical models and calculation methods, the changing trend of the mine safety factor is obtained, which can directly evaluate the safety factor of the mine rock slope under different freeze-thaw cycles. By comparing the safety factor values ​​under different freeze-thaw cycles, the law of how the safety factor changes with the increase in the number of freeze-thaw cycles is obtained.

[0146] The changing law of stress distribution conditions is analyzed by analyzing the dynamic changes of the stress field to analyze 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. The above changes provide an analytical basis for understanding the stability of the mine rock slope under the action of freeze-thaw cycles.

[0147] 3. Stability Assessment and Verification. Based on the damage analysis results and combined with information from rock freeze-thaw tests, a comprehensive assessment of the stability of the mine rock slope was conducted. This freeze-thaw test information provides direct information on the changes in the mechanical properties of rock during freeze-thaw cycles, enhancing the scientific nature and reliability of the assessment results.

[0148] Furthermore, in order to verify the accuracy of the mine rock slope damage analysis results, the analysis results were compared with historical rock freeze-thaw test data. By comparing the similarities and differences between the two, the rationality of the analysis method and the accuracy of the analysis results were verified.

[0149] 4. Comprehensively evaluate the rock slopes of mines and design reinforcement schemes. Based on the results of comparative analysis, the stability of the rock slopes of mines was comprehensively evaluated by taking into account multiple factors such as displacement changes, plastic damage, mine safety factors, and stress distribution. The main problems and potential safety risks currently existing in the rock slopes of mines were analyzed, and corresponding reinforcement measures or improvement suggestions were proposed. A reinforcement scheme for the rock slopes of mines was then designed, which will help to ensure the stability of the rock slopes of mines, 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 of the rock slopes of mines and the evaluation results.

[0150] This paper analyzes the impact of ambient temperature fluctuations on mine rock slopes under the action of freeze-thaw cycles, reveals the deformation evolution law, damage accumulation process and stress state change trend 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. It 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.

[0151] Please refer to 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 the mine rock slope freeze-thaw damage analysis system, 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, is objective and stable, 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 capabilities of the present invention.

[0152] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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 description of the present invention.

Claims

1. A method for analyzing freeze-thaw damage of mine rock slopes, characterized in that, It includes the following steps: Select a sample of a mine rock slope, conduct a freeze-thaw cycle test on the mine rock slope sample, and obtain rock freeze-thaw test information; Set displacement analysis indicators based on the rock freeze-thaw test information, and obtain the displacement change of the rock slope under freeze-thaw cycles based on the displacement analysis indicators; Analyze the plastic damage of the rock slope and the mine safety factor under freeze-thaw cycles based on the rock freeze-thaw test information; Establish a stress analysis model according to the rock freeze-thaw test information, and obtain 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 freeze-thaw cycles by combining the displacement change, the plastic damage, the mine safety factor, and the stress distribution; 2. The method for analyzing freeze-thaw damage of mine rock slopes according to claim 1, wherein, The conducting a freeze-thaw cycle test on the mine rock slope sample and obtaining rock freeze-thaw test information includes: Set the freeze-thaw temperature range, freeze-thaw cycle time, and number of freeze-thaw cycles based on the characteristics of the mine rock slope sample; Conduct a freeze-thaw cycle test on the mine rock slope sample according to the freeze-thaw temperature range, the freeze-thaw cycle time, and the number of freeze-thaw cycles, and obtain rock freeze-thaw test information.

3. The method for analyzing freeze-thaw damage of mine rock slopes according to claim 1, characterized in that The setting displacement analysis indicators based on the rock freeze-thaw test information includes: Set a first analysis indicator based on the rock freeze-thaw test information, and the first analysis indicator includes the rock mass loss rate; Set a second analysis indicator based on the rock freeze-thaw test information, and the second analysis indicator includes the rock porosity.

4. The method for analyzing freeze-thaw damage of mine rock slopes according to claim 3, wherein The obtaining the displacement change of the rock slope under freeze-thaw cycles based on the displacement analysis indicators includes; Analyze the displacement change of the rock slope under freeze-thaw cycles by combining the rock mass loss rate, the rock porosity, and the rock freeze-thaw test information; The rock mass loss rate satisfies the following relationship: ， Among them, Indicates the mass loss rate of the rock, represents the rock mass in the initial dry state, Indicate The mass of the rock in the dry state after a certain number of freeze-thaws; The rock porosity satisfies the following relationship; ， Among them, represents the porosity of the rock, Indicate The saturated mass of the rock after secondary freeze-thaw, Indicate Rock mass in dry state after secondary freeze-thaw, represents the density of water, Indicates the height of the rock, represents the cross-sectional area of the rock.

5. The method for analyzing freeze-thaw damage of mine rock slopes according to claim 1, characterized in that The analyzing the plastic damage of the rock slope and the mine safety factor under freeze-thaw cycles based on the rock freeze-thaw test information includes: Establish a safety factor prediction model based on the plastic damage and the rock freeze-thaw test information; The safety factor prediction model satisfies the following relationship: ， Among them, represents the safety factor of a rock slope, Indicates the freezing depth of the rock slope, represents the length of the rock slope.

6. The method for analyzing freeze-thaw damage of mine rock slopes according to claim 1, characterized in that The establishing a stress analysis model according to the rock freeze-thaw test information includes: Construct a shear stress analysis model according to the rock freeze-thaw test information; Construct a principal stress analysis model based on the rock freeze-thaw test information and the shear stress analysis model; Obtain a stress analysis model based on the shear stress analysis model and the principal stress analysis model.

7. The method for analyzing freeze-thaw damage of mine rock slopes according to claim 6, characterized in that The shear stress analysis model satisfies the following relationship: ， Among them, represents the shear stress of the rock, Indicates the load on the rock, denotes the angle between the rock and the horizontal ground, Denotes the friction coefficient of the shear force measuring roller, represents the cross-sectional area of the rock.

8. The method for analyzing freeze-thaw damage of mine rock slopes according to claim 6, characterized in that, The principal stress analysis model satisfies the following relationship: ， Among them, represents the maximum principal stress, Indicates the uniaxial compressive strength of the rock, Indicates the confining pressure correlation coefficient, represents the minimum principal stress, Indicates the cohesion of the rock, represents the internal friction angle of the rock.

9. The method for analyzing freeze-thaw damage of mine rock slopes according to claim 1, wherein The analyzing the damage results of the mine rock slope under freeze-thaw cycles by combining the displacement change, the plastic damage, the mine safety factor, and the stress distribution includes: Set the damage analysis factors of the mine rock slope under freeze-thaw cycles and obtain the damage analysis results. The damage analysis factors include the displacement change situation, the plastic damage situation, the mine safety factor, and the stress distribution condition; Evaluate the stability of the mine rock slope by combining the damage analysis results and the rock freeze-thaw test information.

10. A freeze-thaw damage analysis system for mine rock slopes, characterized in that The system includes a processor, an input device, an output device, and a memory. The processor, input device, output device, and memory are interconnected. Among them, 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 according to any one of claims 1-9.

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