Mine pit water inflow prediction method suitable for cohesive soil coverage

Abstract

The invention relates to the field of hydrogeology, and discloses a mine pit water inflow prediction method suitable for cohesive soil coverage, which comprises the following steps: special drilling: performing monitoring drilling on a mine, and simultaneously respectively adopting cohesive soil undisturbed samples at different positions to obtain cohesive soil data; monitoring data: respectively observing corresponding data of the drill holes by using a monitoring device; a group hole water pumping test is carried out on the mine to obtain a mine underground water flow field form, observation data are collected in real time in the water pumping process, and water pumping test data are obtained; and water release test: carrying out cohesive soil compaction water release test on the cohesive soil undisturbed sample in a high-pressure state by adopting special equipment. The cohesive soil data are obtained through special drilling, the foundation is laid for follow-up analysis, the dynamic state of the cohesive soil is mastered in real time through data monitoring, the basis for studying the characteristics and change rules of the cohesive soil is built by combining the data with the special drilling data, the interaction between underground water and the cohesive soil is studied through a water pumping test, and key support is provided for prediction.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogeology, and in particular to a method for predicting water inflow in a mine pit covered with clay soil. Background Art

[0002] In the professional field of hydrogeology, mines are generally divided into three categories according to the different aquifers that mainly replenish the deposits. The first category is the deposit that is mainly replenished by porous aquifers, referred to as porous water-filled deposits, and the aquifer is the Quaternary sand, gravel and pebble layer; the second category is the deposit that is mainly replenished by fissure aquifers, referred to as fissure water-filled deposits, and the aquifer is the weathering fissures of bedrock or tectonic fissure aquifers; the third category is the deposit that is mainly replenished by karst aquifers, referred to as karst water-filled deposits, and the aquifer is the limestone karst water aquifer.

[0003] In the past, the hydrogeological community generally regarded clay as an impermeable layer. However, we found in actual work that the porosity of clay is very large, generally 1.0 to 2.0, and saturated clay itself has a fairly rich water content. When the upper part of the mine is covered with thick Quaternary and clay soils, under the conditions of mine drainage, the pressure of deep groundwater is greatly reduced. Under the action of hydraulic gradient, the clay layer begins to release water, causing an increase in effective stress and causing the soil to compress and consolidate. The release of water from clay will become an important source of water in the ore deposit, which will not only increase the amount of water inflow in the mine, but also cause a series of geological environmental problems such as ground subsidence and deformation, causing damage to ground buildings or mining projects, and bringing huge losses. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for predicting water inflow in mines covered with clay soil, so as to solve the problem that when the upper part of the mine is covered with thick Quaternary system and clay soil, the water released by the clay soil will become an important source of water filling for the ore bed, which will not only increase the water inflow in the mine, but also cause a series of geological environmental problems such as ground subsidence and deformation, resulting in damage to ground buildings or mining projects, bringing huge losses.

[0005] To achieve the above objectives, the present invention is implemented by the following technical scheme: A method for predicting water inflow in a mine pit covered with clay soil, comprising the following steps: S1. Special drilling: monitoring drilling is carried out in the mine, and original samples of clay soil are taken at different locations to obtain clay soil data; S2. Data monitoring: using monitoring devices to observe the corresponding data of the drilling holes; S3. Pumping test: Conduct group-hole pumping test on the mine to obtain the mine groundwater flow field morphology. At the same time, collect observation data in real time during the pumping process to obtain pumping test data; S4. Water release test: A special equipment is used to conduct a compaction and water release test on the original clay soil sample under high pressure. During the test, the water samples released by the clay soil are collected simultaneously to obtain the clay soil water release data; S5. Model establishment: Combine clay soil data, pumping test data, and clay water release data to establish a corresponding model; S6. Water volume prediction: Using the corresponding model and the groundwater flow field morphology of the mine, the finite difference method is used to establish a clay soil compression settlement calculation model, calculate the compaction water release of clay soil under different compression states, and predict the water release of clay soil under single-sided drainage conditions at different mining levels; S7. Prevention and control deployment: Obtain the mine groundwater recharge and drainage conditions based on relevant parameters, guide the mine hydrogeological work in combination with the released water volume, and deploy water prevention and control plans.

[0006] Preferably, the monitoring drilling in S1 includes several stratified settlement monitoring drillings and clay pore water pressure monitoring drillings, and the original clay samples taken from different positions are collected during the drilling process using a triple-tube single-action soil sampler, the different positions include an upper layer, a middle layer, and a lower layer, the original clay samples are used for a clay compaction and water release test, and the clay data include clay lithology, distribution, and thickness.

[0007] Preferably, the monitoring device used in S2 includes a stratified settlement observation device installed using a stratified settlement monitoring borehole, and a pore water pressure monitoring device installed using a clay pore water pressure monitoring borehole, and the corresponding data include settlement amounts at different vertical positions and clay pore water pressure change data.

[0008] Preferably, the group-hole pumping test for the mine in S3 is to conduct a group-hole pumping test through the mine's large pumping wells, the number of the large pumping wells is 2 to 5, and the diameter is greater than 200 mm. The group-hole pumping test is to pump water from the large pumping wells simultaneously, and observe the water level changes of the large pumping wells and the water level observation wells in the mining area at the same time. The time of the group-hole pumping test is 5-45 days, and the observation data includes stratified settlement observation data and clay soil pore water pressure monitoring data.

[0009] Preferably, the special equipment in S4 includes a high-pressure consolidation instrument, the maximum pressure range of the high-pressure consolidation instrument exceeds two MPa, the compaction and water release test of clay under high pressure is to use a high-pressure consolidation instrument to conduct a one-dimensional in-situ stress drainage consolidation test on the original sample of clay, and the clay water release data includes the relationship between stress and strain and its changing law during the clay water release compression process, the released water output, the clay consolidation coefficient Cv, the compression modulus Es, and the vertical permeability coefficient Kv.

[0010] Preferably, the maximum consolidation pressure of the one-dimensional in-situ geostress drainage consolidation test is calculated according to the formula P=h*γ, wherein h represents the thickness of the overlying soil layers, and γ represents the weight of the overlying soil layers. The thickness of the overlying soil layers is obtained according to the settlement monitoring boreholes and the clay pore water pressure monitoring boreholes, and the weight of the overlying soil layers is obtained by adopting the empirical values ​​of the overlying soil layers or by taking soil samples of the overlying soil layers through indoor tests.

[0011] Preferably, the corresponding model in S5 includes a three-dimensional model of clay in the mining area and a high-pressure consolidation model. The three-dimensional model of clay in the mining area is B=H(x, y, z), where H represents the thickness of the clay at points x, y, z. The high-pressure consolidation model is as follows: ; ; ; ; ; ; in: is the seepage velocity in clay, is the vertical strain, For super hydrostatic pressure, and is the compression modulus, is the viscosity coefficient of the Newtonian viscosity pot, is the excess pore water pressure, For time, For depth, For the three-dimensional model of clay soil, is the specific gravity of water, It is the difference in hydraulic head between the top and bottom of the clay soil.

[0012] Preferably, the clay soil compression settlement calculation model in S6 uses the finite difference method to establish the numerical model of the above formula, and the simulated clay soil layer is evenly divided into The length is Each grid is represented by a central node, and the top boundary of the model is located at At the node, the bottom boundary is located at At each node for: , where Expressed as .

[0013] Preferably, the finite difference format of the control equation of the clay soil compression settlement calculation model is: .

[0014] Preferably, the relevant parameters in S7 include the distribution and water-richness characteristics of the mine aquifer, the dynamics and flow field characteristics of the mine groundwater, and the water filling factors of the ore bed.

[0015] The present invention provides a method for predicting water inflow in a mine pit covered with clay soil. It has the following beneficial effects: 1. The present invention obtains clay data through special drilling to lay the foundation for subsequent analysis. Data monitoring can grasp the dynamics of clay in real time. Combined with special drilling data, it builds a foundation for studying its characteristics and changing laws. Pumping test studies the interaction between groundwater and clay to provide key support for prediction. Water release test quantifies clay characteristics and builds a model together with other data to accurately simulate clay behavior. Finite difference method is used to predict water inflow, thereby solving the problems raised in the background technology.

[0016] 2. The present invention establishes a three-dimensional model of clay in the mining area and a high-pressure consolidation model, and uses the finite difference method to establish a clay compression settlement calculation model for water volume prediction. It can fully consider the compaction and water release characteristics of clay and its complex relationship with the groundwater system, thereby significantly improving the accuracy of mine water inflow prediction and providing a reliable basis for drainage planning during mining.

[0017] 3. The present invention utilizes a stratified settlement observation device and a pore water pressure monitoring device to observe in real time the settlement amount at different vertical positions of the borehole and the change data of the pore water pressure of the clay soil. During the pumping test, relevant data are continuously collected and combined with the results of the clay soil compaction and water release test. A comprehensive analysis is performed during the model establishment and water volume prediction process. This can not only predict the amount of water inflow from the mine, but also provide an in-depth understanding of the compression and consolidation of the clay soil during mining and the ground subsidence trend caused by this, thereby comprehensively evaluating the impact of mining on the geological environment.

[0018] 4. The present invention reasonably adjusts the mining sequence, mining speed and other parameters according to the prediction of the released water volume under the condition of single-sided drainage of clay soil at different mining levels to avoid the aggravation of water gushing problem caused by mining activities. At the same time, based on the accurate grasp of the conditions for groundwater recharge and drainage, targeted water prevention and control measures are formulated to improve the efficiency and effectiveness of water prevention and control work, reduce mining costs, and ensure safe production and sustainable development of mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention provides a method flow chart for predicting water inflow in a mine pit covered with clay soil. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example: Please refer to the attached Figure 1 The embodiment of the present invention provides a method for predicting water inflow in a mine covered with clay soil, comprising the following steps: S1. Special drilling: monitoring drilling is carried out in the mine, and original samples of clay soil are taken at different locations to obtain clay soil data; the monitoring drilling in S1 includes several layered settlement monitoring boreholes and clay soil pore water pressure monitoring boreholes. Original samples of clay soil are taken at different locations and collected during the drilling process using a triple-tube single-action soil sampler. Different locations include the upper layer, middle layer, and lower layer. Original samples of clay soil are used for clay soil compaction and water release tests. Clay soil data include clay soil lithology, distribution, and thickness.

[0022] Specifically, by monitoring the mine with drilling holes and taking undisturbed samples of clay at different locations, we obtained clay data, thereby obtaining detailed information about the lithology, distribution range and thickness of clay at different locations in the mine, as well as undisturbed soil samples for subsequent experimental analysis, thereby gaining a preliminary understanding of the basic geological characteristics of the clay overburden, providing basic data for subsequent research on the physical and mechanical properties of clay and how it changes during mining.

[0023] S2. Data monitoring: using monitoring devices to observe the corresponding data of the boreholes respectively; the monitoring devices used in S2 include a stratified settlement observation device installed in a stratified settlement monitoring borehole and a pore water pressure monitoring device installed in a clay soil pore water pressure monitoring borehole, and the corresponding data include the settlement amount at different vertical positions and the clay soil pore water pressure change data.

[0024] Specifically, by using monitoring devices to observe the corresponding data of the boreholes, the dynamic response data of clay in the mining process (under the influence of pumping, etc.) was obtained. The tracking and monitoring of the changes in clay in space and time can timely capture the deformation and pore water pressure change trends of clay, and provide real-time data support for analyzing the consolidation process, seepage characteristics and interaction of clay with groundwater, which helps to timely adjust the mining plan and water prevention and control measures.

[0025] S3, Pumping Test: Conduct a group-hole pumping test on the mine to obtain the mine groundwater flow field morphology, and collect observation data in real time during the pumping process to obtain pumping test data; The group-hole pumping test on the mine in S3 is to conduct a group-hole pumping test through the mine's large pumping wells. The number of large pumping wells is 2 to 5, and the diameter is greater than 200mm. The group-hole pumping test is to pump water from the large pumping wells at the same time, and observe the water level changes of the large pumping wells and the water level observation wells in the mining area. The time of the group-hole pumping test is 5-45 days, and the observation data includes stratified settlement observation data and clay soil pore water pressure monitoring data.

[0026] Specifically, by conducting a group-hole pumping test on the mine, the mine groundwater flow field morphology was obtained. At the same time, observation data was collected in real time during the pumping process to obtain pumping test data, thereby obtaining the mine groundwater flow field morphology and the comprehensive response data of clay and groundwater system during the pumping process. This provides key data for accurately predicting mine water inflow and evaluating the impact of mining on the groundwater environment, and also provides a basis for optimizing pumping plans and designing water prevention and control projects.

[0027] S4, water release test: a special equipment is used to conduct a compaction and water release test on the original clay sample under high pressure. During the test, water samples released by the clay are collected simultaneously to obtain clay water release data. The special equipment in S4 includes a high-pressure consolidation instrument. The maximum pressure range of the high-pressure consolidation instrument exceeds two megapascals. The compaction and water release test of clay under high pressure is to conduct a one-dimensional in-situ stress drainage consolidation test on the original clay sample using a high-pressure consolidation instrument. The clay water release data includes the stress and pressure during the clay water release compression process. The relationship between strain and its changing law, released water yield, clay consolidation coefficient Cv, compression modulus Es, and vertical permeability Kv; the maximum consolidation pressure of the one-dimensional in-situ geostress drainage consolidation test is calculated according to the formula P=h*γ, where h represents the thickness of the overlying soil layers, γ represents the weight of the overlying soil layers, the thickness of the overlying soil layers is obtained according to the settlement monitoring boreholes and the clay pore water pressure monitoring boreholes, and the weight of the overlying soil layers is obtained by the empirical values ​​of the overlying soil layers or by taking soil samples of the overlying soil layers for indoor tests.

[0028] Specifically, by using special equipment to carry out clay compaction and water release tests on original clay samples under high pressure, water samples released by the clay are collected simultaneously during the test to obtain clay water release data, which can quantitatively describe the water release capacity and compression consolidation characteristics of clay, and provide core parameters for the subsequent establishment of an accurate model to predict the amount of water released and settlement of clay during the mining process. At the same time, it fills the data gap in the study of clay characteristics under special conditions, provides a scientific basis for accurately evaluating the contribution of clay as a water source to the amount of water inrush in the mine, and also provides important parameter support for analyzing the mechanism of ground subsidence.

[0029] S5, model establishment: Combine clay data, pumping test data, and clay water release data to establish a corresponding model; the corresponding model in S5 includes a three-dimensional model of clay in the mining area and a high-pressure consolidation model. The three-dimensional model of clay in the mining area is B=H (x, y, z), where H represents the thickness of clay at points x, y, z. The high-pressure consolidation model is as follows: ; ; ; ; ; ; in: is the seepage velocity in clay, is the vertical strain, For super hydrostatic pressure, and is the compression modulus, is the viscosity coefficient of the Newtonian viscosity pot, is the excess pore water pressure, For time, For depth, For the three-dimensional model of clay soil, is the specific gravity of water, It is the difference in hydraulic head between the top and bottom of the clay soil.

[0030] Specifically, by combining clay data, pumping test data, and clay water release data, a corresponding model was established, thereby constructing a mathematical model that can reflect the spatial distribution and physical and mechanical behavior of clay in the mining geological environment, thereby realizing the digital and quantitative description of the complex characteristics of clay and the underground hydrogeological conditions of the mine, and converting the actual geological bodies and physical processes into models that can be numerically calculated and analyzed, providing a theoretical framework and computing platform for the subsequent accurate prediction of clay deformation, water release, and interaction with groundwater, so that the changes in clay and groundwater under different mining conditions can be simulated in a virtual environment, providing decision support tools for optimizing mining plans and water prevention and control strategies.

[0031] S6, water volume prediction: using the corresponding model and the groundwater flow field of the mine, the finite difference method is used to establish a clay soil compression settlement calculation model, calculate the compaction water release of clay soil under different compression states, and predict the released water volume of clay soil under single-sided drainage conditions at different mining levels; the clay soil compression settlement calculation model in S6 uses the finite difference method to establish the numerical model of the above formula, and evenly divides the simulated clay layer into The length is Each grid is represented by a central node, and the top boundary of the model is located at At the node, the bottom boundary is located at At each node for: , where Expressed as ; The finite difference format of the control equation of the clay soil compression settlement calculation model is: .

[0032] Specifically, by utilizing the corresponding model and the morphology of groundwater flow field in mines, a finite difference method was used to establish a calculation model for compression settlement of clay, calculate the compaction water release of clay under different compression states, and predict the released water under single-sided drainage conditions of clay at different mining levels. This quantitative prediction result of the amount of water inrush that may be generated by clay in future mining processes was obtained, and an accurate prediction of the compaction water release part of clay in the mine water inrush was achieved. This can provide accurate data basis for mining companies to plan drainage facilities and formulate water prevention and control measures in advance, and also help to evaluate the impact of mining on water resources and water environment, and realize the rational management and protection of water resources, thereby making the water prevention and control work in the mining process more targeted and effective, and reducing the mine safety risks and economic losses caused by water inrush problems.

[0033] S7, prevention and control layout: obtain the mine groundwater recharge and drainage conditions based on relevant parameters, guide the mine hydrogeological work in combination with the released water volume, and lay out water prevention and control plans; the relevant parameters in S7 include the distribution and water-rich characteristics of the mine aquifer, the dynamics and flow field characteristics of the mine groundwater, and the water filling factors of the ore deposit.

[0034] Specifically, by obtaining the mine groundwater recharge and drainage conditions based on relevant parameters, guiding the mine hydrogeological work in combination with the released water volume, and deploying water prevention and control plans, we have achieved effective connection from geological exploration and data prediction to actual engineering prevention and control measures, and transformed the previous research results into specific action plans to ensure that mines can effectively respond to groundwater problems during the mining process, ensure mine safety production, and take into account water resource protection and ecological environmental balance.

[0035] Through the coordinated implementation of various steps, we can obtain various data on clay and related groundwater characteristics, build a model to quantify the characteristics of clay and simulate its behavior, and realize the accurate prediction of mine water inflow. It can not only comprehensively evaluate the impact of mining on the geological environment, but also optimize the mining plan and water prevention and control measures, thus solving the problem that when the upper part of the mine is covered with thick Quaternary system and clay, the water released by clay will become an important source of water for the ore deposit, which will not only increase the mine water inflow, but also cause a series of geological environmental problems such as ground subsidence and deformation, causing damage to ground buildings or mining projects, bringing huge losses.

[0036] In compaction-released water-filled deposits, the water inflow from the mine can be divided into two parts: one part is the water released by compaction of clay soil, and the other part is the water that enters the mine through other pathways (such as lateral recharge of regional groundwater).

[0037] This method firstly presets a mine drainage water level, and then determines the change of the void ratio of the clay soil under the mine drainage water level, including the change amount and change rate, based on the three-dimensional model of clay soil and the high-pressure consolidation model. Finally, the compaction water release amount is calculated considering the three-dimensional distribution state of clay soil and the drainage flow field morphology.

[0038] The clay soil compression settlement calculation model can be used to separately calculate the amount of water released by the compaction of clay soil, distinguish the two different amounts of water mentioned above, and predict the amount of ground settlement caused by mine drainage. It allows mines to take different water prevention and control measures for different sources of water, making mine production and construction safer and reducing production costs.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for predicting water inflow in a mine covered with clay soil, characterized in that: The following steps are involved: S1. Special drilling: monitoring drilling is carried out in the mine, and original samples of clay soil are taken at different locations to obtain clay soil data; S2. Data monitoring: using monitoring devices to observe the corresponding data of the drilling holes; S3. Pumping test: Conduct group-hole pumping test on the mine to obtain the mine groundwater flow field morphology. At the same time, collect observation data in real time during the pumping process to obtain pumping test data; S4. Water release test: A special equipment is used to conduct a compaction and water release test on the original clay soil sample under high pressure. During the test, the water samples released by the clay soil are collected simultaneously to obtain the clay soil water release data; S5. Model establishment: Combine clay soil data, pumping test data, and clay water release data to establish a corresponding model; S6. Water volume prediction: Using the corresponding model and the groundwater flow field morphology of the mine, the finite difference method is used to establish a clay soil compression settlement calculation model, calculate the compaction water release of clay soil under different compression states, and predict the water release of clay soil under single-sided drainage conditions at different mining levels; S7. Prevention and control deployment: Obtain the mine groundwater recharge and drainage conditions based on relevant parameters, guide the mine hydrogeological work in combination with the released water volume, and deploy water prevention and control plans.

2. The method for predicting water inflow in a mine pit covered with clay soil according to claim 1 is characterized in that: The monitoring boreholes in S1 include several stratified settlement monitoring boreholes and clay pore water pressure monitoring boreholes. The original clay samples taken from different positions are collected during the drilling process using a triple-tube single-action soil sampler. The different positions include the upper layer, the middle layer, and the lower layer. The original clay samples are used for clay compaction and water release tests. The clay data include clay lithology, distribution, and thickness.

3. The method for predicting water inflow in a mine pit covered with clay soil according to claim 1, characterized in that: The monitoring device used in S2 includes a stratified settlement observation device installed using a stratified settlement monitoring borehole and a pore water pressure monitoring device installed using a clay soil pore water pressure monitoring borehole. The corresponding data include settlement amounts at different vertical positions and clay soil pore water pressure change data.

4. The method for predicting water inflow in a mine pit covered with clay soil according to claim 1, characterized in that: The group-hole pumping test for the mine in S3 is to conduct a group-hole pumping test through the mine's large pumping wells, the number of the large pumping wells is 2 to 5, and the diameter is greater than 200mm. The group-hole pumping test is to pump water from the large pumping wells simultaneously, and observe the water level changes of the large pumping wells and the mine water level observation wells at the same time. The time of the group-hole pumping test is 5-45 days, and the observation data includes stratified settlement observation data and clay soil pore water pressure monitoring data.

5. The method for predicting water inflow in a mine pit covered with clay soil according to claim 1, characterized in that: The special equipment in S4 includes a high-pressure consolidation instrument, and the maximum pressure range of the high-pressure consolidation instrument exceeds two MPa. The compaction and water release test of clay under high pressure is to use a high-pressure consolidation instrument to conduct a one-dimensional in-situ stress drainage consolidation test on the original sample of clay. The clay water release data includes the relationship between stress and strain and its changing law during the clay water release compression process, the released water output, the clay consolidation coefficient Cv, the compression modulus Es, and the vertical permeability coefficient Kv.

6. The method for predicting water inflow in a mine pit covered with clay soil according to claim 5, characterized in that: The maximum consolidation pressure of the one-dimensional in-situ geostress drainage consolidation test is calculated according to the formula P=h*γ, wherein h represents the thickness of the overlying soil layers, and γ represents the weight of the overlying soil layers. The thickness of the overlying soil layers is obtained according to the settlement monitoring boreholes and the clay pore water pressure monitoring boreholes, and the weight of the overlying soil layers is obtained by using the empirical values ​​of the overlying soil layers or by taking soil samples of the overlying soil layers through indoor tests.

7. The method for predicting water inflow in a mine pit covered with clay soil according to claim 1, characterized in that: The corresponding model in S5 includes a three-dimensional model of clay in the mining area and a high-pressure consolidation model. The three-dimensional model of clay in the mining area is B=H(x, y, z), where H represents the thickness of the clay at points x, y, z. The high-pressure consolidation model is as follows: ； ； ； ； ； ； in: is the seepage velocity in clay, is the vertical strain, For super hydrostatic pressure, and is the compression modulus, is the viscosity coefficient of the Newtonian viscosity pot, is the excess pore water pressure, For time, For depth, For the three-dimensional model of clay soil, is the specific gravity of water, It is the difference in hydraulic head between the top and bottom of the clay soil.

8. The method for predicting water inflow in a mine pit covered with clay soil according to claim 1, characterized in that: The calculation model of clay soil compression settlement in S6 uses the finite difference method to establish the numerical model of the above formula, and the simulated clay soil layer is evenly divided into The length is Each grid is represented by a central node, and the top boundary of the model is located at At the node, the bottom boundary is located at At each node for: , where Expressed as .

9. The method for predicting water inflow in a mine pit covered with clay soil according to claim 8, characterized in that: The finite difference format of the control equation of the cohesive soil compression settlement calculation model is: 。 10. The method for predicting water inflow in a mine pit covered with clay soil according to claim 1, characterized in that: The relevant parameters in S7 include the distribution and water-rich characteristics of the mine aquifer, the dynamics and flow field characteristics of the mine groundwater, and the water filling factors of the ore deposit.

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