Stability analysis method and system for mine slopes under freeze-thaw conditions

Abstract

The present invention relates to the technical field of mine slope stability analysis, and specifically to a stability analysis method and system for a mine slope under freeze-thaw action. The method comprises the following steps: performing a freeze-thaw cycle simulation experiment on a mine slope, and obtaining freeze-thaw cycle experimental information of the mine slope; establishing a freeze-thaw cycle-mine slope pore analysis model based on the freeze-thaw cycle experimental information, and analyzing the pore change trend of the mine slope rock under different freeze-thaw conditions by using the freeze-thaw cycle-mine slope pore analysis model; constructing a mine slope sliding force prediction model according to the pore change trend and the freeze-thaw cycle experimental information, and using the mine slope sliding force prediction model to predict the sliding situation of the mine slope under different freeze-thaw conditions; establishing a mine slope stability evaluation system in combination with the pore change trend, the sliding situation and the freeze-thaw cycle experimental information, and analyzing the stability of the mine slope under the freeze-thaw condition according to the mine slope stability evaluation system.

Description

Technical Field

[0001] The invention relates to the technical field of mine slope stability analysis, and in particular to a method and system for analyzing the stability of a mine slope under freeze-thaw effects. Background Art

[0002] The stability of mine slopes is directly related to the normal operation of mine production activities and the safety of the surrounding ecological environment. Once the slope is unstable, it will cause geological disasters such as collapse, landslide, and mud-rock flow, which will not only affect the normal production of the mine, but also may cause casualties and property losses.

[0003] In cold regions, low temperatures in winter can cause moisture in the slope rock and soil to freeze and expand, while thawing in spring can increase soil moisture and reduce strength. Repeated freeze-thaw cycles can change the physical and mechanical properties of the mine slope rock and soil, thereby affecting its stability. In addition, freeze-thaw can also aggravate the development of cracks and fissures in the mine slope, further weakening the overall stability of the slope.

[0004] When dealing with the natural phenomenon of freeze-thaw cycles, the existing mine slope stability analysis methods ignore the complex geological structure inside the slope and the impact of the freeze-thaw process on the properties of the rock and soil. It is difficult to capture the changes in rock characteristics under the action of freeze-thaw cycles, and thus cannot accurately predict the stability of the slope.

[0005] The existing mine slope stability analysis methods have certain limitations in predicting and preventing geological disasters such as landslides and collapses. More advanced and comprehensive monitoring technologies are needed to obtain internal slope deformation and damage information; at the same time, more accurate numerical models need to be established to better simulate and predict the impact of freeze-thaw cycles on slope stability, so as to more accurately evaluate the stability of mine slopes and provide technical support for mine safety production and environmental protection. Summary of the invention

[0006] In view of the shortcomings of existing methods and the needs of practical applications, the present invention deeply analyzes the internal conditions of the rock slope, geological structure information and the influence of the freeze-thaw process on the properties of the rock and soil, and establishes relevant mathematical models to predict the stability of the rock slope under different freeze-thaw conditions, which helps to comprehensively and accurately predict the stability of the rock slope under freeze-thaw cycles. On the one hand, the present invention provides a stability analysis method for a mine slope under freeze-thaw conditions, which includes the following steps: performing a freeze-thaw cycle simulation experiment on the mine slope and obtaining freeze-thaw cycle experimental information of the mine slope; establishing a freeze-thaw cycle-mine slope pore analysis model based on the freeze-thaw cycle experimental information, and analyzing the pore change trend of the mine slope rock under different freeze-thaw conditions through the freeze-thaw cycle-mine slope pore analysis model; constructing a mine slope sliding force prediction model according to the pore change trend and the freeze-thaw cycle experimental information, and using the mine slope sliding force prediction model to predict the sliding of the mine slope under different freeze-thaw conditions; establishing a mine slope stability evaluation system in combination with the pore change trend, the sliding situation and the freeze-thaw cycle experimental information, and analyzing the stability of the mine slope under freeze-thaw conditions based on the mine slope stability evaluation system. The present invention conducts freeze-thaw cycle simulation experiments on mine slopes and establishes a series of analysis models and evaluation systems based on the experimental information, which can improve prediction accuracy, reveal the intrinsic influence relationship of rocks, and promptly discover stability problems of mine slopes, which helps mining companies take measures in advance and effectively prevent the occurrence of geological disasters such as landslides and collapses.

[0007] Optionally, the freeze-thaw cycle-mine slope porosity analysis model satisfies the following relationship:

[0008]

[0009] in, Indicates the rock porosity of the mine slope under different freeze-thaw cycle conditions, The thermal expansion coefficient of the fluid volume under different freeze-thaw cycle conditions, Indicates the number of freeze-thaw cycles of the mine slope rock, It represents the thermal expansion coefficient of slope rock under different freeze-thaw cycle conditions. Indicates the influence coefficient of different freeze-thaw cycles on rock porosity. The model of the present invention links parameters such as rock porosity of mine slopes under different freeze-thaw cycle conditions, thermal expansion coefficient of fluid volume under different freeze-thaw cycle conditions, number of freeze-thaw cycles of mine slope rocks, thermal expansion coefficient of slope rocks under different freeze-thaw cycle conditions, and influence coefficient of different freeze-thaw cycles on rock porosity, thus achieving accurate quantification and analysis of porosity changes.

[0010] Optionally, the analysis of the porosity change trend of the mine slope rock under different freeze-thaw conditions by the freeze-thaw cycle-mine slope porosity analysis model includes: obtaining the rock porosity of the mine slope under different freeze-thaw conditions by using the freeze-thaw cycle-mine slope porosity analysis model; obtaining fitting information of porosity and freeze-thaw cycle number according to the rock porosity of the mine slope under different freeze-thaw conditions; and analyzing the porosity change trend of the mine slope rock under different freeze-thaw conditions based on the fitting information. The present invention can obtain the rock porosity under different freeze-thaw cycle numbers through model calculation, thereby realizing dynamic monitoring of porosity changes.

[0011] Optionally, the construction of a mine slope sliding force prediction model based on the pore change trend and the freeze-thaw cycle experimental information includes: establishing a freeze-thaw cycle-rock ice expansion force calculation model based on the pore change trend and the freeze-thaw cycle experimental information; and obtaining the rock frost expansion force under different freeze-thaw conditions based on the freeze-thaw cycle-rock ice expansion force calculation model. The present invention constructs a mine slope sliding force prediction model based on the pore change trend and the freeze-thaw cycle experimental information, dynamically predicts the slope sliding force, and improves the accuracy of the slope stability assessment results.

[0012] Optionally, the freeze-thaw cycle-rock ice expansion force calculation model satisfies the following relationship:

[0013]

[0014] in, It represents the ice expansion force of the mine slope rock under different freeze-thaw cycle conditions. represents the volume expansion coefficient of water after freezing, Indicates the width of water in the main crack of the mine slope, represents the elastic modulus of the mine slope rock, It represents the average temperature change under different freeze-thaw cycle conditions. represents the influence coefficient of different freeze-thaw cycles on rock porosity, The present invention takes into account multiple factors and can adjust the model parameters to adapt to the prediction of ice expansion force under different mine slopes and different freeze-thaw cycle conditions, thereby improving the applicability and flexibility of the model.

[0015] Optionally, the construction of a mine slope sliding force prediction model based on the pore change trend and the freeze-thaw cycle experimental information also includes: establishing a mine slope sliding force prediction model based on the pore change trend and the rock frost heave force. The sliding force prediction model of the present invention not only takes into account the change trend of rock porosity, but also combines the key factor of rock frost heave force, which can more comprehensively evaluate the stability of mine slopes.

[0016] Optionally, the mine slope sliding force estimation model satisfies the following relationship:

[0017]

[0018] in, It represents the comprehensive sliding force of the mine slope under different freeze-thaw cycle conditions. Represents the cohesion index of the mine slope rock, Indicates the rock porosity of the mine slope under different freeze-thaw cycles, Indicates the saturated bulk density of the mine slope rock, Indicates the width of the rock on the mine slope. Indicates the horizontal distance between the main crack of the mine slope rock and the top of the slope. Indicates the slope inclination of the mine slope rock. It represents the comprehensive internal friction of the mine slope rock under different freeze-thaw cycle conditions. Indicates the ice expansion force of the mine slope rock under different freeze-thaw cycle conditions. The key parameters in the model of the present invention can change with the change of freeze-thaw cycle conditions, so the model can dynamically reflect the sliding force of the mine slope under different conditions.

[0019] Optionally, the use of the mine slope sliding force prediction model to predict the sliding of the mine slope under different freeze-thaw conditions includes: using the mine slope sliding force prediction model to obtain the sliding force prediction data of the mine slope rock under different freeze-thaw conditions; and predicting the sliding of the mine slope under different freeze-thaw conditions based on the sliding force prediction data. The present invention uses the mine slope sliding force prediction model to predict the sliding of the mine slope under different freeze-thaw conditions, which is helpful for early warning and risk assessment of the mine slope.

[0020] Optionally, the mine slope stability assessment system is established in combination with the pore change trend, the sliding condition and the freeze-thaw cycle experimental information, and the stability of the mine slope under freeze-thaw conditions is analyzed according to the mine slope stability assessment system, including: introducing historical evaluation data of mine slope stability, and setting a mine slope stability safety threshold based on the historical evaluation data; performing a comparative analysis of the mine slope stability assessment system through the mine slope stability safety threshold, and obtaining the stability of the mine slope under different freeze-thaw conditions based on the analysis results. The present invention sets a stability safety threshold by introducing historical evaluation data, so that the assessment process is more quantitative and clear, which is convenient for actual operation, and can more intuitively judge the stability of the mine slope under different freeze-thaw conditions.

[0021] In the second aspect, in order to efficiently execute the stability analysis method of the mine slope under the action of freeze-thaw provided by the present invention, the present invention also provides a stability analysis system of the mine slope under the action of freeze-thaw, 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 stability analysis method of the mine slope under the action of freeze-thaw as described in the first aspect of the present invention. The stability analysis system of the mine slope under the action of freeze-thaw of the present invention has a compact structure and stable performance, and can stably execute the stability analysis method of the mine slope under the action of freeze-thaw provided by the present invention, thereby improving the overall applicability and practical application ability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flow chart of the stability analysis method of a mine slope under freeze-thaw action;

[0023] Figure 2 It is a schematic diagram of a fitting curve of the rock porosity of a slope sample and the number of freeze-thaw cycles in the stability analysis method of a mine slope under freeze-thaw action of the present invention;

[0024] Figure 3 It is a schematic diagram of rock geometric elements of a mine slope in the stability analysis method of a mine slope under freeze-thaw action of the present invention;

[0025] Figure 4 It is a schematic diagram of the comprehensive sliding force curve under different freeze-thaw conditions in the stability analysis method of the mine slope under freeze-thaw action of the present invention;

[0026] Figure 5 It is a structural diagram of the stability analysis system of the mine slope under the action of freeze-thaw of the present invention. DETAILED DESCRIPTION

[0027] See also Figure 1 The present invention analyzes the internal structure of the rock slope of the mine and the characteristics of the rock under different freeze-thaw cycles, and designs a series of mathematical models that can accurately simulate and analyze the internal microscopic deformation mechanism and macroscopic sliding trend of the mine slope under different freeze-thaw conditions. Finally, the stability of the mine slope is comprehensively analyzed based on the stability evaluation system, providing solid technical support for the safe production of the mine, and providing a scientific basis for the formulation and implementation of environmental protection strategies. The present invention provides a stability analysis method for the mine slope under freeze-thaw, and the stability analysis method for the mine slope under freeze-thaw includes the following steps:

[0028] S1. Conduct freeze-thaw cycle simulation experiment on the mine slope and obtain freeze-thaw cycle experiment information of the mine slope. The specific implementation steps and contents are as follows;

[0029] In order to explore the specific impact of natural freeze-thaw on the stability of mine slopes, a series of freeze-thaw cycle simulation tests were designed and executed in the embodiment to simulate the periodic freeze-thaw cycle process experienced by the mine slope rock mass in a real environment, so as to more accurately capture and analyze the deformation dynamics of the internal structure of the mine slope and the changing laws of the external morphology under the action of freeze-thaw cycles, thereby providing a solid experimental basis and scientific prediction means for evaluating its stability.

[0030] In the embodiments, experimental materials and groups of freeze-thaw cycle simulation experiments.

[0031] Representative mine slope samples were used in the freeze-thaw cycle simulation experiment, and the mine slope samples were grouped according to their freezing temperatures. For freezing temperature grouping information in the freeze-thaw cycle simulation experiment, please see Table 1.

[0032] Table 1 Temperature grouping information in freeze-thaw cycle simulation experiment

[0033]

[0034] According to the settings in Table 1, four experimental condition groups are designed in this embodiment, and the freezing temperatures of the mine slope samples are set to 10°C, -5°C, -20°C and -30°C respectively. The selection of the above temperature range is conducive to comprehensive coverage and in-depth study of the freeze-thaw response characteristics of mine slopes under different low temperature environments. At the same time, in order to be closer to the actual water replenishment of mine slopes in natural environments, the above four groups of samples are exposed and placed in the same experimental environment. The four groups of samples can absorb moisture from the air or undergo natural water replenishment processes such as simulated atmospheric rainfall, thereby more accurately simulating the dynamic changes in moisture in the mine slopes in the freeze-thaw cycle under natural conditions and their impact on slope stability.

[0035] In the specific implementation of the freeze-thaw cycle simulation experiment, the four groups of samples were first marked as Group 1, 2, 3, and 4 respectively. The above samples had the same initial moisture content level, which could eliminate the experimental deviation caused by the difference in initial moisture content, thereby ensuring the accuracy and reliability of the experimental results.

[0036] Subsequently, according to the experimental design, the freezing temperatures of groups 1, 2, 3, and 4 were set to 10°C, -5°C, -20°C, and -30°C, respectively. The above temperature points covered a wide range of low temperatures, aiming to comprehensively investigate the freeze-thaw behavior characteristics of the mine slope under different freezing conditions. At the same time, in order to simulate the melting stage of the natural environment, the melting temperature of the four groups of samples was uniformly set to 25°C to reproduce the temperature change law in the natural climate.

[0037] Next, multiple freeze-thaw cycle tests were carried out on the four groups of samples, with the number of cycles mainly including 5 times, 10 times, 20 times and 30 times. Based on this, the progressive changes in the physical properties and stability of the mine slope samples were revealed with the increase in the number of freeze-thaw cycles.

[0038] During the experiment, it is necessary to observe in real time the morphological changes of the samples, the generation and development of cracks, possible mass loss and other experimental phenomena, and record in detail the key information of each group of samples at different freeze-thaw cycles. The above information will provide data support for subsequent data analysis, result interpretation and theoretical model construction.

[0039] In addition to the above experimental steps, further measures are taken to enhance the robustness of the experimental results. In this embodiment, a repeated test strategy is implemented for each group of experiments. Three parallel samples are prepared for each group of samples to carry out the same freeze-thaw cycle experiment, and the accidental effects caused by individual sample differences or deviations in experimental operations are reduced by increasing the sample size. After completing the experiments of all parallel samples, the collected data are statistically analyzed and the average value of each group of experimental data is calculated. The above steps are crucial to improving the accuracy and reliability of the data. Based on this, the outliers or noise in individual data points can be smoothed out, thereby more truly reflecting the overall freeze-thaw response characteristics of the mine slope samples under specific freeze-thaw experimental conditions, and then obtaining the freeze-thaw cycle experimental information of the mine slope, providing more solid and reliable data support for the subsequent stability analysis of the mine slope.

[0040] Furthermore, the steps and methods for obtaining the freeze-thaw cycle experimental information of the mine slope in the present embodiment are only an optional condition of the present invention. In other embodiments, the method for obtaining the freeze-thaw cycle experimental information of the mine can be adjusted according to the actual situation of the location of the mine slope. The mine slopes in different regions have their own unique geological conditions, climatic conditions and hydrological conditions. In the embodiment, the method for obtaining the experimental information is adjusted according to the actual situation to ensure that the experimental results are closer to the real environment and improve the representativeness and applicability of the experimental results.

[0041] S2. A freeze-thaw cycle-mine slope pore analysis model is established based on freeze-thaw cycle experimental information. The freeze-thaw cycle-mine slope pore analysis model is used to analyze the pore change trend of the mine slope rock under different freeze-thaw conditions. The specific implementation steps and contents are as follows;

[0042] Firstly, a freeze-thaw cycle-mine slope porosity analysis model was established based on the freeze-thaw cycle experimental information. The specific implementation contents are as follows:

[0043] In an optional embodiment, first, the experimental data of the temperature range information, freeze-thaw cycle number, rock type classification and other key parameters of the mine slope are systematically extracted from the freeze-thaw cycle experimental information. The above data are closely related to the freeze-thaw cycle process of the mine slope rock, and can also accurately reflect the physical transformation and chemical changes of the mine slope rock under the action of freeze-thaw. In the embodiment, the relevant data are pre-processed to identify and remove possible outliers or erroneous data. At the same time, the data is standardized or normalized to ensure the smooth construction of the subsequent model. Subsequently, based on the freeze-thaw cycle experimental data of the mine slope and the geological structure, climatic conditions and freeze-thaw cycle conditions of the mine slope, a suitable mathematical or statistical method is selected to construct a model, including but not limited to regression analysis, machine learning algorithms or other complex data analysis techniques.

[0044] At the same time, in order to ensure the prediction ability and generalization performance of the freeze-thaw cycle-mine slope porosity analysis model, an independent validation data set is used to evaluate the model. The above steps help to verify the processing ability of the above analysis model for unknown data, and the model parameters and structure can also be adjusted and optimized through performance indicators such as prediction error and accuracy. Then, a freeze-thaw cycle-mine slope porosity analysis model that is consistent with experimental observations and has practical application value is established, providing strong support for the safety and stability evaluation of mining projects.

[0045] The above freeze-thaw cycle-mine slope porosity analysis model satisfies the following relationship:

[0046]

[0047] in, Indicates the rock porosity of the mine slope under different freeze-thaw cycle conditions, The thermal expansion coefficient of the fluid volume under different freeze-thaw cycle conditions, Indicates the number of freeze-thaw cycles of the mine slope rock, It represents the thermal expansion coefficient of slope rock under different freeze-thaw cycle conditions. Represents the influence coefficient of different freeze-thaw cycles on rock porosity.

[0048] The rock porosity of the mine slope under different freeze-thaw cycle conditions refers to the change in the proportion of the internal pore volume of the mine slope rock to the total volume under different temperature ranges and freeze-thaw cycle numbers. The above ratio is an important indicator to measure the physical properties of the rock, such as the density, water storage capacity, permeability, and mechanical properties. During the freeze-thaw cycle, the rock will be repeatedly affected by the expansion of water freezing and the contraction of melting, which will cause microcracks in the rock or expand the original cracks, thereby changing the pore structure of the rock. In order to accurately evaluate the changes in the porosity of the mine slope rock under different freeze-thaw cycle conditions, it is necessary to conduct systematic experimental research and data analysis, and then understand the changing law of rock porosity and its relationship with freeze-thaw cycle parameters, so as to provide a scientific basis for the stability assessment and management of the mine slope.

[0049] The thermal expansion coefficient of the fluid volume under different freeze-thaw cycle conditions refers to the measure of the relative change in the volume of the fluid when the temperature changes after experiencing freeze-thaw cycles of different numbers and conditions. The thermal expansion coefficient can also be called the volume expansion coefficient. It is a physical quantity that describes the volume change of an object when the temperature changes. During the freeze-thaw cycle, the fluid will experience repeated freezing and melting processes, which will cause changes in its internal structure and properties. As the number of freeze-thaw cycles increases, the thermal expansion coefficient of the fluid will also change, which will directly affect the internal structure of the mine slope.

[0050] The number of freeze-thaw cycles of mine slope rocks refers to the number of repetitions of a complete temperature cycle process experienced by different groups of rock samples during the mine slope experiment, where the temperature drops from positive temperature to negative temperature and then rises back to positive temperature. The above process simulates the natural phenomenon that mine slope rocks freeze in cold seasons and melt in warm seasons. The number of freeze-thaw cycles in the embodiments mainly includes 5 times, 10 times, 20 times and 30 times.

[0051] The thermal expansion coefficient of slope rock under different freeze-thaw cycle conditions refers to the measure of the relative change in volume of slope rock when the temperature changes after experiencing freeze-thaw cycles of different times and conditions. Different types of rocks have different mineral compositions and microstructures. The above differences will cause the rocks to exhibit different thermal expansion properties when the temperature changes. As the number of freeze-thaw cycles increases, the microcracks and pores inside the rocks will gradually expand and connect, causing the rock structure to become looser, which in turn affects the thermal expansion coefficient of the mine slope rock, making its volume change at different temperatures more significant.

[0052] The influence coefficient of freeze-thaw cycle on rock porosity in the embodiment needs to satisfy the following relationship:

[0053]

[0054] in, represents the influence coefficient of freeze-thaw cycle on rock porosity, represents the fluid bulk modulus of the mine slope rock, Indicates the number of freeze-thaw cycles of the mine slope rock, represents the thermal exchange coefficient, Represents the average temperature change value of freeze-thaw cycles.

[0055] The bulk modulus of the fluid of the mine slope rock refers to the measurement of the volume change of the fluid inside the rock when it is under pressure. Since the fluid inside them has no fixed shape, its bulk modulus mainly reflects the strength of the interaction between fluid molecules and the resistance of the fluid to compression, and can be used to describe the ability of the fluid in the rock to resist volume change when it is under pressure.

[0056] The thermal exchange coefficient, usually referred to as the heat exchange coefficient, is a physical quantity that describes the relationship between the heat flow between the fluid and the solid wall and the temperature difference between them during the heat transfer process. The above coefficient reflects the efficiency of heat transfer between the fluid and the solid wall and is an important parameter in the heat transfer process.

[0057] Based on the specific requirements of different experimental groups, the starting and ending temperatures of the freeze-thaw cycle are set at different values. The specimens are lowered to a certain low temperature for freezing and then raised to room temperature for thawing, specifically referring to the temperature difference from the lowest temperature to the highest temperature.

[0058] The above heat exchange coefficient satisfies the following relationship:

[0059]

[0060] in, represents the heat exchange coefficient, represents the heat flow, Indicates the temperature difference between the fluid and the rock wall of the mine slope. The larger the heat exchange coefficient, the higher the heat transfer efficiency between the fluid and the solid wall at the same temperature difference.

[0061] The average temperature change value of multiple freeze-thaw cycles refers to the average temperature change amplitude when the ambient temperature changes back and forth between above and below freezing point during one or more freeze-thaw cycles. It can be used to describe and quantify the intensity and frequency of freeze-thaw cycles, which is of great significance for understanding the effects of freeze-thaw cycles on soil conditions, rock structure, slope conditions, etc.

[0062] The influence coefficient of different freeze-thaw cycles on rock porosity is a complex comprehensive indicator, which is affected by many factors. By quantitatively analyzing the changes in rock pore structure before and after freeze-thaw cycles, the degree and law of the influence of freeze-thaw cycles on rock pore structure can be evaluated, providing a scientific basis for the stability assessment and management of mine slopes.

[0063] Then, the freeze-thaw cycle-mine slope porosity analysis model was used to obtain the rock porosity of the mine slope under different freeze-thaw conditions; then, the fitting information of porosity and freeze-thaw cycle number was obtained based on the rock porosity of the mine slope under different freeze-thaw conditions; and based on the above fitting information, the porosity change trend of the mine slope rock under different freeze-thaw conditions was analyzed. The specific implementation contents are as follows:

[0064] In an optional embodiment, key parameter data are input into a freeze-thaw cycle-mine slope porosity analysis model based on freeze-thaw cycle experimental information of the mine slope, which mainly includes fluid data in the rock, freeze-thaw cycle data, and slope rock data, etc. The model is run to calculate to obtain predicted values ​​of rock porosity under different freeze-thaw conditions, that is, to obtain the rock porosity of the mine slope under different freeze-thaw conditions.

[0065] In the embodiment, the predicted values ​​of rock porosity of the mine slope under different freeze-thaw conditions are further obtained, see Table 2.

[0066] Table 2 Predicted values ​​of rock porosity of mine slopes under different freeze-thaw conditions

[0067]

[0068] Based on the information in Table 2, it can be seen that under the continuous action of multiple freeze-thaw cycles, the porosity of the mine slope samples shows an increasing trend. The above common characteristics reveal that the freeze-thaw process gradually erodes the rock structure of the mine slope. Although the porosity growth rate varies, the porosity inside the rock of the mine slope will continue to accumulate with the increase of freeze-thaw cycles.

[0069] In addition, the changes in rock porosity in mine slopes under freeze-thaw cycles are affected by the inherent properties of the rock, such as lithology, mineral composition and internal microstructure. Even under the same freeze-thaw cycle conditions, mine slopes may show different damage patterns and macroscopic manifestations.

[0070] Next, the fitting information of porosity and freeze-thaw cycle number was obtained based on the rock porosity of the mine slope under different freeze-thaw conditions.

[0071] According to the rock porosity of the mine slope under different freeze-thaw conditions, fitting curves between four groups of samples and the number of freeze-thaw cycles were drawn. In an optional embodiment, the porosity data and the corresponding freeze-thaw cycle numbers are sorted to form multiple groups of data points, and according to the distribution characteristics and trends of the data, a suitable fitting method is selected, such as linear regression, polynomial regression, exponential regression, etc. At the same time, statistical software or programming language can be used to fit and analyze the data to obtain the fitting equation and correlation coefficient between the porosity and the number of freeze-thaw cycles. For details, please refer to Figure 2 .

[0072] based on Figure 2 The information clearly indicates that there is a significant strong correlation between the porosity of the four groups of samples and the number of freeze-thaw cycles. Based on the data analysis results, it can be seen that the fitting relationship between the porosity data of the four groups of samples and the number of freeze-thaw cycles has an extremely high degree of fit, and the correlation coefficients all exceed the high-level threshold of 0.900. The above results not only prove the accuracy and reliability of the freeze-thaw cycle-mine slope porosity analysis model in predicting and analyzing porosity changes, but also provide a clear basis for quantifying how porosity changes with the number of freeze-thaw cycles.

[0073] Based on Figure 2 The changing trend of rock porosity with the number of freeze-thaw cycles under different freeze-thaw conditions can be analyzed, and the speed and amplitude of the increase of porosity with the increase of the number of cycles can be observed. At the same time, the change rate of the fitting curve under different freeze-thaw conditions can be compared. Based on the analysis results under different conditions, the changing law and mechanism of rock porosity of mine slopes under different freeze-thaw conditions are summarized, providing a scientific basis for mine slope stability assessment and rock engineering design.

[0074] More importantly, the trends and characteristics presented by the fitting curves further verified the feasibility of the analysis model in practical applications. The above verification process not only helps to understand the freeze-thaw effect and changes in rock pore structure, but also provides a solid theoretical basis and practical analysis tools for subsequent fields such as mine slope stability assessment, rock engineering durability design, and slope prediction under freeze-thaw environments.

[0075] Therefore, the freeze-thaw cycle-mine slope porosity analysis model can be used to effectively predict the porosity changes of mine slope rocks under different freeze-thaw cycle conditions, which is conducive to accurately evaluating the stability of rock engineering in freeze-thaw areas and predicting the freeze-thaw effect of rocks.

[0076] Furthermore, in the present embodiment, the analysis method of the porosity change trend of the mine slope rock is only an optional condition of the present invention. In one or some other embodiments, the mine slope rock porosity analysis method can be optimized according to the specific conditions of the mine slope and the porosity analysis requirements. Different mine rock slopes have unique geological conditions, rock types, structural characteristics and environmental factors. The fitting technology is selected according to the data characteristics to better capture the nonlinear relationship or stage-by-stage changes between the porosity and the number of freeze-thaw cycles.

[0077] S3. A mine slope sliding force prediction model is constructed based on the pore change trend and the freeze-thaw cycle experimental information. The mine slope sliding force prediction model is used to predict the sliding of the mine slope under different freeze-thaw conditions. The specific implementation steps and contents are as follows:

[0078] According to the pore change trend and freeze-thaw cycle experimental information, a freeze-thaw cycle-rock ice expansion force calculation model is established; and based on the freeze-thaw cycle-rock ice expansion force calculation model, the rock frost heave force under different freeze-thaw conditions is obtained. The specific implementation contents are as follows:

[0079] In order to accurately evaluate the ice expansion force of mine slope rocks under different freeze-thaw cycle conditions, it is necessary to comprehensively consider a series of interrelated factors, which act together on the mine slope rocks and affect the generation and distribution of their ice expansion force. Among them, the temperature changes of freeze-thaw cycles, the physical properties of rocks, such as elastic modulus and Poisson's ratio, and the volume expansion space when water freezes are all key factors affecting the ice expansion force of mine slope rocks.

[0080] In the embodiments, the interactions and influence mechanisms among the above-mentioned multiple factors need to be comprehensively considered, and relevant data and information can be obtained by means of experimental testing, numerical simulation or on-site monitoring, so as to more comprehensively understand the behavioral characteristics of mine slope rocks under the action of freeze-thaw cycles, and provide a scientific basis for slope stability assessment and engineering protection design.

[0081] The above freeze-thaw cycle-rock ice expansion force calculation model satisfies the following relationship:

[0082]

[0083] in, It represents the ice expansion force of the mine slope rock under different freeze-thaw cycle conditions. represents the volume expansion coefficient of water after freezing, Indicates the width of water in the main crack of the mine slope, represents the elastic modulus of the mine slope rock, represents the average temperature change of the freeze-thaw cycle, represents the influence coefficient of different freeze-thaw cycles on rock porosity, Represents the Poisson's ratio of the mine slope rock.

[0084] The ice expansion force of the mine slope rock under different freeze-thaw cycle conditions refers to the internal pressure or expansion force generated on the rock due to the freezing of water inside the rock and the expansion of volume after the mine slope rock has experienced freeze-thaw cycles of different times or different temperature ranges. In the embodiment, the ice expansion force is an important factor in the stability assessment of the mine slope rock under cold climate conditions, which can lead to the expansion of microcracks inside the rock, changes in pore structure, and a decrease in overall strength.

[0085] The volume expansion coefficient of water after freezing refers to the proportion of volume increase of water during the freezing process due to the lower density of ice than water. The above coefficient can be used to indicate the proportion of volume increase of unit volume of water after freezing. Due to the pore structure and connectivity of the rock on the mine slope, the pore size, shape, distribution and connectivity between pores of the rock determine the storage and migration capacity of water in the rock. Rocks with complex pore structures may be more likely to accumulate water and produce greater ice expansion force when frozen.

[0086] The width of water in the main crack of the mine slope refers to the width of water between the crack walls. When there is water in the cracks of the mine slope, the width of water actually refers to the size of the space occupied by water in the cracks, which is related to the opening of the cracks, but is also affected by factors such as crack fillings, water penetration pressure, and the roughness of the crack walls. The higher the water rate of the main crack of the mine slope, the greater the volume expansion generated when freezing, and the uneven distribution of water will lead to the concentration of local ice expansion force.

[0087] The elastic modulus of rock reflects its ability to resist elastic deformation when subjected to external forces. When external forces act on the mine slope and cause it to deform elastically, corresponding stress will be generated inside the rock, and the elastic modulus is a physical quantity that describes the relationship between this stress and strain. The elastic modulus of rock is affected by many factors, including the type, composition, particle size, water content, pore size, and load state of the rock.

[0088] The Poisson's ratio of mine slope rock refers to the ratio of its lateral expansion strain to the longitudinal strain generated along the direction of the force when the rock is subjected to unidirectional compression. It reflects one aspect of the volume deformation characteristics of the rock when subjected to external force.

[0089] The frequency of freeze-thaw cycles and the temperature range of each cycle directly affect the freezing and melting process of water inside the rock. Strong temperature fluctuations or more frequent cycles will lead to more significant ice expansion effects. That is, the average temperature change under different freeze-thaw cycle conditions is the key influencing factor of the ice expansion effect.

[0090] In an optional embodiment, based on the freeze-thaw cycle-rock ice expansion force calculation model and freeze-thaw cycle experimental information in the embodiment, the above model can take into account factors such as the physical properties, pore structure, moisture content and temperature changes of the rock, and use the rock physical property data and freeze-thaw cycle conditions in the freeze-thaw cycle experimental information as input parameters to parameterize the model; the physical property data, pore structure data and set freeze-thaw cycle conditions of the rock sample are input into the model, and at the same time, a computer program or simulation software can be used to run the model to calculate the rock frost heave force under different freeze-thaw conditions, that is, the rock frost heave force under different freeze-thaw conditions can be obtained based on the above freeze-thaw cycle-rock ice expansion force calculation model.

[0091] Then, according to the above pore change trend and rock frost heave force, a model for predicting the sliding force of the mine slope is established. The specific implementation contents are as follows:

[0092] Based on the freeze-thaw cycle-mine slope porosity analysis model and freeze-thaw cycle experimental information, the changing pattern of rock porosity under different freeze-thaw cycle conditions is analyzed, and the correlation between porosity change and factors such as freeze-thaw cycle number, temperature, and humidity is identified.

[0093] The freeze-thaw cycle-rock ice expansion force calculation model is used to analyze the ice expansion force generated by the mine slope rock during the freezing process, and then the relationship between the rock ice expansion force and porosity, rock type, moisture content and other factors under different freeze-thaw cycle conditions is analyzed.

[0094] According to rock mechanics and slope stability theory, a suitable sliding force prediction model framework is selected, porosity and ice expansion force are used as key input parameters, and freeze-thaw cycle experimental information and statistical analysis methods are used to determine other key parameters in the model. The above parameters include but are not limited to the physical properties of mine slope rocks, slope location, and internal forces of rocks. The above parameters can be determined through freeze-thaw cycle experimental information, on-site monitoring and statistical analysis methods.

[0095] The above-mentioned mine slope sliding force prediction model satisfies the following relationship:

[0096]

[0097] in, It represents the comprehensive sliding force of the mine slope under different freeze-thaw cycle conditions. Represents the cohesion index of the mine slope rock, Indicates the rock porosity of the mine slope under different freeze-thaw cycles, Indicates the saturated bulk density of the mine slope rock, Indicates the width of the rock on the mine slope. Indicates the horizontal distance between the main crack of the mine slope rock and the top of the slope. Indicates the slope inclination of the mine slope rock. It represents the comprehensive internal friction of the mine slope rock under different freeze-thaw cycle conditions. It represents the ice expansion force of mine slope rock under different freeze-thaw cycle conditions.

[0098] The comprehensive sliding force refers to the downward sliding tendency and actual sliding force of the rock on the mine slope due to the combined action of physical, chemical and mechanical processes under different freeze-thaw cycle conditions. The magnitude and direction of the above-mentioned comprehensive sliding force are affected by many factors such as the physical and mechanical properties of the slope rock, geological structure, hydrological conditions, climatic conditions, and freeze-thaw cycle. In actual application, accurate prediction of the comprehensive sliding force of the mine slope based on numerical simulation is helpful to ensure the stability and safety of the mine slope.

[0099] The cohesion index of mine slope rock refers to a quantitative index related to the bonding force or cohesion between the internal particles or structures of the mine slope rock. In the process of analyzing the stability of mine slopes, cohesion affects the stability and anti-sliding ability of the slope. The magnitude of cohesion depends on many factors such as the mineral composition, structure, porosity, water content and stress state of the rock. Under freeze-thaw cycle conditions, the cohesion of the rock will be significantly affected because the freezing and melting of water will change the physical and mechanical properties of the rock.

[0100] The saturated bulk density of the mine slope rock refers to the weight of a unit volume of rock when the rock sample is completely saturated with water, that is, the rock pores are filled with water. The saturated bulk density can be obtained by experimental measurement, that is, the rock sample of the embodiment is placed in water, so that it fully absorbs water to reach a saturated state, and then its weight is measured and divided by the volume of the sample to calculate the value of the saturated bulk density. The saturated bulk density is closely related to factors such as the mineral composition, porosity, and water content of the rock. In mine slope engineering, the determination of the saturated bulk density is of great significance for evaluating slope stability, designing support structures, and formulating reasonable mining plans.

[0101] The width of the rock in a mine slope refers to the size of the rock layer or rock structure along the direction of the slope at a specific location or area of ​​the slope. However, in the actual application of mine slopes, due to the complexity and diversity of the slopes, the specific definition and measurement method of rock width may vary depending on the specific situation.

[0102] The horizontal distance between the main crack of the mine slope rock and the top of the slope refers to the distance measured horizontally from the top of the mine slope, i.e. the top line, to the main crack, i.e. the location of the most important crack on the slope that has the greatest impact on the slope stability. The above distance is one of the important parameters for assessing slope stability, designing slope management plans, and preventing and controlling geological disasters.

[0103] In the embodiment, the horizontal distance between the main crack of the rock on the mine slope and the top of the slope needs to satisfy the following relationship:

[0104]

[0105] in, Indicates the horizontal distance between the main crack of the mine slope rock and the top of the slope. Indicates the height of the rock slope of the mine slope. Indicates the slope inclination of the mine slope rock. represents the length of water in the main crack, Indicates the depth of the main cracks on the top of the rock slope of the mine. Indicates the surface inclination angle of the main rock structure of the mine slope.

[0106] For the calculation relationship of the above horizontal distance, please refer to Figure 3 ,in Indicates the height of the rock slope of the mine slope. h2 Indicates the depth of the main cracks on the top of the rock slope of the mine. Indicates the surface inclination angle of the main rock structure of the mine slope. Indicates the slope inclination of the mine slope rock.

[0107] In an optional embodiment, a mine slope sliding force prediction model is used to obtain the sliding force prediction data of the mine slope rock under different freeze-thaw conditions; based on the sliding force prediction data, the sliding of the mine slope under different freeze-thaw conditions is predicted, and the specific implementation content is as follows:

[0108] Combining freeze-thaw cycle experimental data and mine slope porosity analysis models, we obtained data on changes in rock porosity under different conditions of temperature, humidity, and number of freeze-thaw cycles. These data provide a key basis for understanding changes in the internal microstructure of rocks.

[0109] Based on the above freeze-thaw cycle experimental data and conditions, the freeze-thaw cycle-rock ice expansion force calculation model was used to further calculate the ice expansion force generated by water freezing into ice inside the mine slope rock under different conditions. The above model takes into account the influence of factors such as rock pore structure, moisture content and temperature gradient on ice expansion force, ensuring the accuracy of the calculation results.

[0110] In addition, other parameters can be determined through freeze-thaw cycle experimental information, geological survey reports, field measurements, and literature, etc., which can obtain detailed information on rock physical properties, slope geometry, and external forces.

[0111] After collecting all the necessary parameter data, the pre-processed and verified porosity, ice expansion force and other relevant parameter data are input into the sliding force estimation model, which can ensure the accuracy and completeness of the data and thus guarantee the reliability of the model prediction results.

[0112] The above-mentioned sliding force prediction model comprehensively analyzes and processes the input data based on internal algorithms and logic. The model will consider multiple factors such as the physical and mechanical properties of rocks, changes in pore structure, ice expansion force, slope geometry and external forces, and calculate the estimated sliding force data of mine slope rocks under different freeze-thaw conditions. After the model calculation is completed, the estimated sliding force values ​​under different conditions will be output. For details, please refer to Figure 4 , where 1, 2, 3, and 4 represent four groups of mine slope samples respectively.

[0113] At the same time, the comprehensive sliding force of the mine slope rock under different freeze-thaw cycle conditions is further analyzed and compared to evaluate the impact of different freeze-thaw conditions on slope stability. According to the estimated results, corresponding slope management measures and suggestions can be proposed to ensure the safety and stability of the mine slope.

[0114] Furthermore, in this embodiment, the method for predicting the sliding force based on the mine slope sliding force estimation model is only an optional condition of this embodiment. In one or some other embodiments, the sliding force prediction method can be adjusted according to the actual situation of the mine slope and the target requirements of mine stability. Different mine slopes have unique geological conditions, rock characteristics, hydrological environment and historical deformation records. Adjusting the sliding force prediction method according to the actual situation of the slope and the target requirements of mine stability can more accurately reflect the actual situation of the slope and improve the accuracy and reliability of the prediction and analysis results.

[0115] S4. Combine the pore change trend, sliding situation and freeze-thaw cycle experiment information to establish a mine slope stability assessment system. According to the mine slope stability assessment system, analyze the stability of the mine slope under freeze-thaw conditions. The specific implementation steps and contents are as follows:

[0116] Through freeze-thaw cycle experiments, the porosity of mine slope rocks under different freeze-thaw cycle conditions is measured and recorded. The porosity-related data can directly reflect the changes in the internal structure of the rock and have an important impact on the stability of the slope.

[0117] The comprehensive sliding force of the rock on the mine slope under different freeze-thaw cycles is obtained by using the sliding force prediction model and experimental information, which is directly related to the potential sliding risk of the slope.

[0118] The freeze-thaw cycle experiment information records in detail the experimental process and results of the experimental conditions of different freeze-thaw cycles, which is the basic information for understanding the impact of freeze-thaw on slope stability.

[0119] In an optional embodiment, a mine slope stability evaluation system is established based on the collected data and constructed evaluation indicators. The system comprehensively considers the influence of rock porosity, comprehensive sliding force and freeze-thaw cycle experimental information on slope stability under different freeze-thaw cycle conditions. For information on the mine slope stability evaluation system in the embodiment, please refer to Table 3.

[0120] Table 3 Mine slope stability assessment system table

[0121]

[0122] Based on the information in Table 3, the porosity changes of the mine slope rocks under different freeze-thaw cycle conditions are recorded and analyzed. Porosity is an important indicator reflecting the changes in the internal structure of the mine slope rocks, which directly affects the mechanical properties and stability of the rocks.

[0123] Detailed records of the temperature range, humidity, number of cycles and other conditions of each freeze-thaw cycle experiment, including basic information such as the slope's geographical location, geological structure, rock type, slope, slope height, groundwater level, etc., will help to have a more comprehensive understanding of slope stability. Through the conditions, process and results of the freeze-thaw cycle experiment, combined with the physical information of the mine slope, a comprehensive assessment of the stability of the slope under freeze-thaw action can be made.

[0124] The porosity change diagram is displayed in the form of a chart, and the trend of porosity change with the number of freeze-thaw cycles or other influencing factors helps to more intuitively understand the dynamic change process of the internal structure of the rock. Then, the impact of freeze-thaw on the rock pore structure can be quickly and accurately evaluated, providing a basis for analyzing slope stability.

[0125] The comprehensive sliding force is a key parameter for assessing the risk of slope sliding. Based on this, the sliding risk of mine slopes under different freeze-thaw cycles can be evaluated, and the correlation between porosity changes and sliding force can be explored.

[0126] Firstly, the historical evaluation data of mine slope stability are introduced, and the mine slope stability safety threshold is set based on the historical evaluation data.

[0127] The historical evaluation data of the stability of the mine slope in the embodiment comes from the following aspects: on-site monitoring data including long-term monitoring records of slope displacement, stress, seepage and other parameters; historical accident records. Analyze historical slope instability accidents to understand the slope state, environmental conditions and triggering factors before the accident; collect stability assessment reports of mine slopes; consult academic papers, technical reports and books in related fields to understand the stability evaluation methods and results of mine slopes.

[0128] Based on the analysis results of historical evaluation data and the actual situation of mine slopes, the safety threshold of mine slope stability is set. The above safety threshold should meet the following requirements:

[0129] The safety threshold should be able to reflect the actual situation of slope stability, be monitored and evaluated in actual projects, and have clear quantitative standards and operability. On the other hand, considering that the stability of mine slopes will change with changes in environmental conditions, mining activities and other factors, the safety threshold should have a certain dynamic adjustment capability, in which the safety threshold can be directly set based on historical records and experience, or the critical value or threshold range of slope stability can be determined using statistical analysis methods.

[0130] After setting the safety threshold, you need to verify and adjust it to observe how well the evaluation results match the actual situation. If you find that the safety threshold is set unreasonably or the evaluation results are inaccurate, you should make timely adjustments and optimizations.

[0131] Then, a comparative analysis of the mine slope stability assessment system was conducted through the mine slope stability safety threshold, and the stability status of the mine slope under different freeze-thaw conditions was obtained based on the analysis results.

[0132] In an optional embodiment, the rock porosity under different freeze-thaw conditions is compared with the safe porosity threshold. If the comparative analysis shows that the rock porosity of the mine slope exceeds the safe threshold, it can be determined that the slope is unstable under the current freeze-thaw conditions, and the mine manager is advised to take reinforcement measures, such as adding support structures, reducing mining intensity, etc., to improve the stability of the slope.

[0133] In another optional embodiment, one or more safety thresholds of sliding force are set according to the specific geological conditions, engineering safety standards and historical experience data of the mine slope. The above safety threshold is not only a benchmark for evaluating the risk level of slope sliding under different freeze-thaw conditions, but also a key basis for formulating effective prevention and response measures. Furthermore, according to the degree of deviation between the comprehensive sliding force and the safety threshold, the stability of the slope is divided into different levels, mainly including four levels: stable, relatively stable, critically stable, and unstable.

[0134] In an optional embodiment, a systematic approach is used to analyze the stability of mine slopes under different freeze-thaw conditions.

[0135] First, through the first evaluation indicator: freeze-thaw cycle experimental conditions, processes and results and the physical information of the mine slope, a comprehensive analysis is conducted, and the rock physical response and structural changes during the experiment are deeply analyzed. Combined with the physical properties data of the mine slope, its structural characteristics and the geological conditions in which it is located are analyzed, laying a solid foundation for subsequent analysis.

[0136] Then, the second evaluation indicator is integrated: rock porosity is compared with historical data, and a porosity change diagram is drawn. The above steps can capture the key change trend of porosity, and combine engineering experience with statistical methods to set a porosity warning threshold that can both effectively warn and avoid overreaction. When the porosity approaches or exceeds this threshold, the system automatically issues a preliminary warning, indicating that there may be stability problems in the mine slope.

[0137] Next, based on the third evaluation indicator: the schematic diagram of the comprehensive sliding force and porosity change of the slope, an advanced numerical model was used to simulate the stress state and displacement trend of the slope under different freeze-thaw conditions, and the degree of deviation between the sliding force and the safety threshold was compared, and then the slope sliding risk level was divided, from stable to unstable. Based on this, the stability analysis system intelligently triggers the corresponding level of warning signals, which not only clarifies the current stability of the mine slope, but also warns of potential sliding risks, providing a scientific basis for management decisions.

[0138] The embodiment uses estimated data and a preset warning threshold system to predict and analyze the landslide of mine slopes under various freeze-thaw scenarios. For slopes of different risk levels, the stability analysis system can automatically recommend or customize a series of protection and governance measures. For slopes on the edge of primary warning, preventive measures such as strengthening daily monitoring and implementing local reinforcement can be taken; and for unstable slopes that are already facing high danger, more active governance strategies are emphasized, such as comprehensive slope reconstruction and implementation of unloading and load reduction projects, in an effort to restore and enhance the stability of the slope in the shortest possible time, ensuring personnel safety and the normal operation of mining operations.

[0139] Furthermore, in the present embodiment, the stability analysis method of the mine slope under different freeze-thaw conditions is only an optional condition of the present embodiment. In one or some other embodiments, the stability analysis method can be optimized according to the actual situation of the mine slope and the slope stability target, which can more accurately capture the key factors affecting the slope stability, not only improve the accuracy and pertinence of the analysis structure, but also improve the response speed, promote technological innovation and enhance the scientific nature of decision-making.

[0140] See also Figure 5In an optional embodiment, in order to efficiently execute the stability analysis method of a mine slope under freeze-thaw provided by the present invention, the present invention also provides a stability analysis system for a mine slope under freeze-thaw, in which an input device, a processor, an output device and a 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 stability analysis method for a mine slope under freeze-thaw provided by the present invention. The stability analysis system for a mine slope under freeze-thaw of the present invention has a complete structure, is objective and stable, and can efficiently execute the stability analysis method for a mine slope under freeze-thaw of the present invention, thereby improving the overall applicability and practical application capability of the present invention.

[0141] 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. The stability analysis method of mine slope under freeze-thaw action is characterized by: The steps include: Conduct freeze-thaw cycle simulation experiments on mine slopes and obtain freeze-thaw cycle experimental information on mine slopes; A freeze-thaw cycle-mine slope pore analysis model is established based on the freeze-thaw cycle experimental information, and the porosity change trend of the mine slope rock under different freeze-thaw conditions is analyzed by the freeze-thaw cycle-mine slope pore analysis model; A mine slope sliding force prediction model is constructed according to the pore change trend and the freeze-thaw cycle experimental information, and the mine slope sliding force prediction model is used to predict the sliding of the mine slope under different freeze-thaw conditions; A mine slope stability assessment system is established in combination with the pore change trend, the sliding condition and the freeze-thaw cycle experimental information, and the stability of the mine slope under freeze-thaw conditions is analyzed based on the mine slope stability assessment system; The freeze-thaw cycle-mine slope porosity analysis model satisfies the following relationship: ， in, Indicates the rock porosity of the mine slope under different freeze-thaw cycle conditions, The thermal expansion coefficient of the fluid volume under different freeze-thaw cycle conditions, Indicates the number of freeze-thaw cycles of the mine slope rock, It represents the thermal expansion coefficient of slope rock under different freeze-thaw cycle conditions. represents the influence coefficient of different freeze-thaw cycles on rock porosity; The construction of a mine slope sliding force prediction model based on the pore change trend and the freeze-thaw cycle experimental information includes: A freeze-thaw cycle-rock ice expansion force calculation model is established according to the pore change trend and the freeze-thaw cycle experimental information; Based on the freeze-thaw cycle-rock ice expansion force calculation model, the rock frost expansion force under different freeze-thaw conditions is obtained; The freeze-thaw cycle-rock ice expansion force calculation model satisfies the following relationship: ， in, It represents the ice expansion force of the mine slope rock under different freeze-thaw cycle conditions. represents the volume expansion coefficient of water after freezing, Indicates the width of water in the main crack of the mine slope, represents the elastic modulus of the mine slope rock, It represents the average temperature change under different freeze-thaw cycle conditions. represents the influence coefficient of different freeze-thaw cycles on rock porosity, It represents the Poisson's ratio of the rock in the mine slope; The construction of a mine slope sliding force prediction model based on the pore change trend and the freeze-thaw cycle experimental information also includes: Establishing a mine slope sliding force estimation model based on the pore change trend and the rock frost heave force; The mine slope sliding force prediction model satisfies the following relationship: ， in, It represents the comprehensive sliding force of the mine slope under different freeze-thaw cycle conditions. Represents the cohesion index of the mine slope rock, Indicates the rock porosity of the mine slope under different freeze-thaw cycles, Indicates the saturated bulk density of the mine slope rock, Indicates the width of the rock on the mine slope. Indicates the horizontal distance between the main crack of the mine slope rock and the top of the slope. Indicates the slope inclination of the mine slope rock. It represents the comprehensive internal friction of the rock in the mine slope under different freeze-thaw cycle conditions. It represents the ice expansion force of mine slope rock under different freeze-thaw cycle conditions.

2. The stability analysis method of mine slope under freeze-thaw action according to claim 1 is characterized in that: The freeze-thaw cycle-mine slope pore analysis model is used to analyze the pore change trend of the mine slope rock under different freeze-thaw conditions, including: The freeze-thaw cycle-mine slope porosity analysis model is used to obtain the rock porosity of the mine slope under different freeze-thaw conditions; According to the rock porosity of the mine slope under different freeze-thaw conditions, the fitting information of porosity and freeze-thaw cycle number is obtained; Based on the fitting information, the porosity variation trend of the mine slope rock under different freeze-thaw conditions is analyzed.

3. The stability analysis method of mine slope under freeze-thaw action according to claim 1 is characterized in that: The method of using the mine slope sliding force prediction model to predict the sliding of the mine slope under different freeze-thaw conditions includes: The mine slope sliding force prediction model is used to obtain the sliding force prediction data of the mine slope rock under different freeze-thaw conditions; Based on the sliding force estimation data, the sliding conditions of the mine slope under different freeze-thaw conditions are predicted.

4. The method for analyzing the stability of a mine slope under freeze-thaw conditions according to claim 1, characterized in that: The mine slope stability assessment system is established by combining the pore change trend, the sliding condition and the freeze-thaw cycle experimental information. The stability of the mine slope under freeze-thaw conditions is analyzed according to the mine slope stability assessment system, including: Introducing historical evaluation data of mine slope stability, and setting a mine slope stability safety threshold based on the historical evaluation data; The mine slope stability safety threshold is used to compare and analyze the mine slope stability assessment system, and the stability status of the mine slope under different freeze-thaw conditions is obtained based on the analysis results.

5. The stability analysis system of the mine slope under the action of freeze-thaw is characterized by: 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 stability analysis method of a mine slope under freeze-thaw action as described in any one of claims 1 to 4.

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