Method and system for monitoring cemented filling and curing process under metal mine

Abstract

The invention provides a metal mine underground cemented filling and curing process monitoring method and system, and belongs to the technical field of underground mine filling monitoring, and the monitoring method comprises the steps of experimental research, numerical simulation and field monitoring. The test research comprises a filling body strength test, a filling body mechanical parameter test and a filling body water content test; the numerical simulation comprises the step of extracting a stress curve, a displacement curve and a plastic zone of the filling body in a simulation environment; the field monitoring comprises displacement measurement, stress measurement and temperature measurement. According to the method, a multi-dimensional monitoring means of experimental research, numerical simulation and field monitoring complementation is provided, the filling body solidification process can be comprehensively monitored and analyzed, a full-mining-area model is established by utilizing numerical simulation software, and the full-mining-area large-range filling body solidification effect evaluation can be realized only by performing sampling test and field data monitoring in a typical stope.

Description

Technical Field

[0001] The present application relates to the technical field of underground mine filling monitoring, and in particular to a method and system for monitoring the cementation filling solidification process in a metal mine. Background Art

[0002] The rock movement and surface subsidence caused by underground mining have a great impact on the surface ecology and environment of the mining area. Backfill mining is a mining technology that uses prepared backfill materials to replace underground mineral resources. After the ore is mined, the backfill is promptly filled into the goaf, which can effectively reduce the sinking space of the top rock layer, thereby achieving the purpose of rock movement control. Backfill mining can improve resource recovery rate, reduce the surface occupation of solid waste such as waste rock and tailings, reduce surface damage in the mining area, and protect the ecology and environment of the mining area.

[0003] After the backfill mining operation is completed, the backfill will play a vital role as a bearing structure to support the overlying rock. The actual working state of the backfill deep in the mine will have a direct impact on the surface movement and deformation. In view of this close correlation, it is particularly necessary to conduct real-time and accurate monitoring of the actual working state of the backfill underground. This not only allows timely understanding of the stability and support effect of the backfill, but also provides an important reference for subsequent mining operations and surface deformation control.

[0004] Patent publication number CN202467929U discloses an online monitoring system for filling performance, and patent publication number CN103528731A discloses an online monitoring system for coal mine paste filling based on fiber grating sensing. These two methods only monitor the single angle of vertical and lateral deformation of the filling, and cannot achieve the comprehensive evaluation of the filling solidification effect.

[0005] In view of this, it is necessary to design an improved monitoring method and system for the cementation filling solidification process in metal mines to solve the above problems. Summary of the invention

[0006] In view of the technical problems existing in the background technology, the present application provides a method and system for monitoring the cementation filling solidification process in metal mines, which realizes comprehensive monitoring and analysis of the filling solidification process through complementary multi-dimensional monitoring means of experimental research, numerical simulation and on-site monitoring.

[0007] In the first aspect, the present application provides a method for monitoring the cementation filling solidification process in a metal mine, including experimental research, numerical simulation and on-site monitoring; the experimental research includes filling body strength test, filling body mechanical parameter test and filling body moisture content test; the numerical simulation includes extracting the stress curve, displacement curve and plastic zone of the filling body under the simulated environment; the on-site monitoring includes displacement measurement, stress measurement and temperature measurement; specifically includes the following steps: S1. Scan the goaf with a 3D scanner to obtain a goaf model, and install a displacement measuring device, a stress measuring device and a temperature measuring device in the goaf; S2. Lead the connectors of the connection lines of the displacement measuring device, the stress measuring device and the temperature measuring device to the tunnel outside the goaf, adjust the initial parameters of each device, establish a filling retaining wall and fill the goaf; S3. During the curing of the filling body, the displacement, pressure and temperature data of the filling body are collected in real time to obtain the displacement, pressure and temperature change curves of the filling body respectively; S4. Conduct sampling test on the filling body inside the goaf to obtain the engineering characteristic parameters of the filling body; S5. Importing the goaf model obtained in step S1 into numerical simulation software to form a numerical model, substituting the engineering characteristic parameters of the filling body obtained in step S4 into the numerical model, and extracting the filling body stress curve, displacement curve and plastic zone after calculation by the simulation software until equilibrium is reached; S6. Combine the filling body displacement, pressure and temperature change curves obtained in step S3, the filling body engineering characteristic parameters obtained in step S4, and the filling body stress curve, displacement curve and plastic zone obtained in step S5 to comprehensively evaluate the filling body solidification effect.

[0008] As a further improvement of the present application, the engineering characteristic parameters of the filling body include compressive strength, tensile strength, internal friction angle, cohesion, elastic modulus, Poisson's ratio and water content.

[0009] In the second aspect, an embodiment of the present application provides a system for monitoring the cementation filling and solidification process in an underground metal mine, which adopts the monitoring method for the cementation filling and solidification process in an underground metal mine described in the first aspect for monitoring, and includes a numerical model and a field monitoring device; the field monitoring device includes a displacement measuring device, a stress measuring device and a temperature measuring device installed in the filling body; the displacement measuring device, the stress measuring device and the temperature measuring device are connected to a signal receiver; the displacement measuring device includes a gripper, an extension rod, a pipe sleeve and a base connected in sequence from top to bottom, and a plurality of springs and a plurality of displacement sensors are arranged inside the pipe sleeve, and the displacement sensor is connected in series with the spring through a rigid metal rod.

[0010] As a further improvement of the present application, the number of the springs is at least two, and the displacement sensor is arranged between the two springs.

[0011] As a further improvement of the present application, the first spring is connected to the bottom end of the extension rod through a rigid metal rod, and the last spring is connected to the bottom of the sleeve through a rigid metal rod.

[0012] As a further improvement of the present application, the springs have the same elastic coefficient; the displacement sensors have the same elastic coefficient.

[0013] As a further improvement of the present application, the gripper is coupled to the roof of the goaf.

[0014] As a further improvement of the present application, the base is fixed on the bottom plate of the goaf.

[0015] As a further improvement of the present application, the signal receiver is connected to a computer; the signal receiver and the computer are arranged in a tunnel outside the filling retaining wall.

[0016] As a further improvement of the present application, the stress measuring device includes an earth pressure gauge; and the temperature measuring device includes a temperature sensor.

[0017] The beneficial effects of this application are: The present application provides a monitoring method and system for the cementation backfill solidification process in metal mines. The monitoring method includes experimental research, numerical simulation and field monitoring; the experimental research includes backfill strength test, backfill mechanical parameter test and backfill moisture content test; the numerical simulation includes extracting the stress curve, displacement curve and plastic zone of the backfill under the simulated environment; the field monitoring includes displacement measurement, stress measurement and temperature measurement. The present application proposes a multi-dimensional monitoring method that complements experimental research, numerical simulation and field monitoring, which can realize comprehensive monitoring and analysis of the backfill solidification process. By using numerical simulation software to establish a model of the entire mining area, it is only necessary to conduct sampling tests and field monitoring data in typical mining areas to realize a large-scale backfill solidification effect evaluation in the entire mining area.

[0018] This application does not need to install a large number of monitoring devices. It only needs to extract monitoring data in typical empty areas, and then import the extracted data into simulation software to form a composite curve to complete the evaluation of the filling solidification effect. Compared with the fiber grating sensor online monitoring system, this method is low-cost and highly efficient. For the irregular and complex empty areas formed by metal mines, it is impossible to install monitoring devices on a large scale. The method of this application can still complete the evaluation of the filling solidification effect, and the method is highly applicable.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A detailed diagram of a method for monitoring cementation filling and curing process in a metal mine in an embodiment of the present application; Figure 2 This is a layout diagram of the field monitoring equipment in the metal mine underground in the embodiment of the present application; Figure 3 A cross-sectional view of a displacement measuring device in an embodiment of the present application; Figure 4 This is a schematic diagram of a soil pressure gauge in an embodiment of the present application; Figure 5 Schematic diagram of a triaxial compression test of a filling body sample in an embodiment of the present application; Figure 6 This is a schematic diagram of an indoor experiment for testing the moisture content of a filling body sample in an embodiment of the present application; Figure 7 This is an equivalent model diagram of the filling body numerical analysis in the embodiment of the present application; Figure 8 This is a flow chart for comprehensive analysis of the curing effect of the filling body in the embodiment of this application.

[0022] Explanation of the accompanying drawings: 1. filling body; 101. filling retaining wall; 2. displacement measuring device; 201. gripper; 202. extension rod; 203. pipe sleeve; 204. base; 205. spring; 206. displacement sensor; 207. rigid metal rod; 208. fastening bolt; 209. anchor; 3. stress measuring device; 301. earth pressure gauge; 3011. pressure box; 3012. nut; 3013. connection module; 3014. connection ring; 4. temperature measuring device; 5. signal receiver; 6. computer; 7. connecting line; 8. surrounding rock; 9. tunnel; 10. drying box; 11. triaxial compression strength testing device; 1101. upper pressure plate; 1102. lower pressure plate; 1103. vertical load; 1104. confining pressure; 12. filling body sample. DETAILED DESCRIPTION

[0023] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0028] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] In the field of underground mine filling monitoring technology, the existing monitoring systems mainly focus on the vertical or lateral deformation of the filling body, lack of comprehensive monitoring and evaluation of the changes in various performance of the filling body during the solidification process, and it is difficult to fully understand the actual working status and long-term stability of the filling body.

[0031] In order to solve the technical problems in the prior art of online monitoring of filling performance, such as a single monitoring angle and the inability to comprehensively evaluate the solidification effect, the present application provides a method and system for monitoring the cementation filling solidification process in underground metal mines, wherein a comprehensive monitoring and analysis of the filling solidification process is achieved through a multi-dimensional monitoring method that complements experimental research, numerical simulation and on-site monitoring.

[0032] Please refer to Figure 1 , which is a detailed diagram of the monitoring method of the cementation filling and solidification process in a metal mine provided in an embodiment of the present application, including experimental research, numerical simulation and on-site monitoring.

[0033] The experimental study includes strength testing, mechanical parameter testing and moisture content testing of the filling body 1. The most direct way to obtain the mechanical strength and corresponding mechanical parameters of the filling body 1 is the basic experimental method. Common loading methods include uniaxial compression, triaxial compression, shear and tensile tests. To obtain the moisture content of the filling body 1, the filling body sample 12 is dried to a constant weight at a specified temperature, the mass of the sample before and after drying is weighed, and the moisture content is calculated.

[0034] Numerical simulation includes extracting the stress curve, displacement curve and plastic zone of the filling body 1 under the simulated environment. It is based on the constitutive model, fully considers the heterogeneity and anisotropy of the rock mass, and simulates and analyzes the stress-strain law of the rock mass. Commonly used numerical methods include finite element method, finite difference method, discrete element method and boundary element method, and commonly used software includes ANSYS, FLAC3D, PFC3D and 3DEC.

[0035] On-site monitoring includes displacement measurement, stress measurement and temperature measurement, wherein stress measurement and temperature measurement are pre-buried with earth pressure gauge 301 and temperature sensor respectively, and monitoring data are obtained through a computer system.

[0036] The specific steps include: S1. Use a three-dimensional scanner to scan the goaf to obtain a goaf model, and install a displacement measuring device 2, a stress measuring device 3 and a temperature measuring device 4 in the goaf.

[0037] Specifically, according to the selected typical goaf, the goaf is scanned by a three-dimensional scanner to obtain the real shape of the goaf, the base 204 of the displacement measuring device 2 is fixed at a suitable position, and then the qualified displacement sensor 206 and the spring 205 are placed in the middle pipe sleeve 203, connected with the top extension rod 202 and the base 204, and the height is adjusted so that the top of the extension rod 202 contacts the roof of the area to be filled and remains stable; then the soil pressure gauge 301 and the temperature sensor are fixed at suitable positions in the goaf.

[0038] S2. Lead the connectors of the connecting wires 7 of the displacement measuring device 2, the stress measuring device 3 and the temperature measuring device 4 to the tunnel 9 outside the goaf, adjust the initial parameters of each device, build a filling retaining wall 101 and perform filling operations on the goaf.

[0039] Specifically, after the installation of the above-mentioned devices is completed, the connectors of the connecting wires 7 of each device are led out of the tunnel 9 outside the goaf, and the initial parameters of each device are adjusted and recorded. After completion, the filling retaining wall 101 is built and the goaf is filled and connected. The two sides of the filling body 1 are surrounding rocks 8, and the top and bottom of the filling body 1 are the roof and bottom of the goaf, respectively.

[0040] S3. During the solidification of the filling body 1, the displacement, pressure and temperature data of the filling body 1 are collected in real time to obtain the displacement, pressure and temperature change curves of the filling body 1 respectively.

[0041] Specifically, during the curing of the filling body 1, the displacement, pressure and temperature data of the filling body 1 are extracted using the computer 6 and the signal receiver 5 at regular intervals, and a relationship curve with the measurement time is formed.

[0042] S4. Conduct sampling test on the filling body 1 inside the goaf to obtain the engineering characteristic parameters of the filling body 1.

[0043] Specifically, after the filling body 1 solidifies for a period of time, samples of the filling body 1 inside the goaf are taken through the filling retaining wall 101. The taken samples are packed in moisturizing boxes, transported to the ground and processed into specimens that can undergo triaxial compression strength tests and drying tests. The engineering characteristic parameters of the filling body 1 are obtained through the test results.

[0044] S5. Import the goaf model obtained in step S1 into the numerical simulation software to form a numerical model, substitute the engineering characteristic parameters of the filling body 1 obtained in step S4 into the numerical model, and after calculation by the simulation software until equilibrium is reached, extract the stress curve, displacement curve and plastic zone of the filling body 1 to characterize the state of the filling body 1 in the goaf.

[0045] S6. Combine the displacement, pressure and temperature change curves of the filling body 1 obtained in step S3, the engineering characteristic parameters of the filling body 1 obtained in step S4, and the stress curve, displacement curve and plastic zone of the filling body 1 obtained in step S5 to comprehensively evaluate the filling and curing effect.

[0046] Furthermore, in the embodiment of the present application, the engineering characteristic parameters of the filling body 1 include compressive strength, tensile strength, internal friction angle, cohesion, elastic modulus, Poisson's ratio and water content.

[0047] The present application also provides a monitoring system for the cementing filling and curing process in a metal mine, including a numerical model and field monitoring equipment; Figure 2 As shown, the on-site monitoring equipment includes a displacement measuring device 2, a stress measuring device 3 and a temperature measuring device 4 installed in the filling body 1; the displacement measuring device 2, the stress measuring device 3 and the temperature measuring device 4 are connected to a signal receiver 5. The stress measuring device 3 includes an earth pressure gauge 301; and the temperature measuring device 4 includes a temperature sensor.

[0048] like Figure 3 As shown, the displacement measuring device 2 includes a gripper 201, an extension rod 202, a sleeve 203 and a base 204 connected in sequence from top to bottom, a plurality of springs 205 and a plurality of displacement sensors 206 are arranged inside the sleeve 203, and the displacement sensors 206 are connected in series with the springs 205 through a rigid metal rod 207. The gripper 201 is coupled to the top plate of the goaf, and the base 204 is fixed to the bottom plate of the goaf.

[0049] Specifically, the top extension rod 202 of the displacement measuring device 2 is a cylindrical rod as a whole, and a gripper 201 is provided at its upper end, and the gripper 201 is used to increase the stability with the top plate. The top of the displacement measuring device 2 is supported to the top plate of the empty area to be filled by the extension rod 202, and the extension rod 202 can be selected in different lengths according to the on-site conditions. The top opening of the pipe sleeve 203 connected in the middle is coupled with the extension rod 202 but not fixed, and the bottom end of the pipe sleeve 203 is closed and fixed to the base 204 by the fastening bolt 208. The pipe sleeve 203 is vertically installed on the base 204, and the inner diameter of the pipe sleeve 203 is larger than the outer diameter of the displacement sensor 206 and the spring 205, and the outer diameter of the pipe sleeve 203 is smaller than the inner diameter of the base 204, and can be embedded in the base 204. The base 204 is fixed to the bottom plate of the goaf by the anchor 209.

[0050] Further, in the embodiment of the present application, the number of springs 205 is at least two, and the displacement sensor 206 is disposed between the two springs 205. The springs 205 have the same elastic coefficient; the displacement sensor 206 has the same elastic coefficient. The first spring 205 is connected to the bottom end of the extension rod 202 through a rigid metal rod 207, and the last spring 205 is connected to the bottom of the sleeve 203 through the rigid metal rod 207.

[0051] Specifically, a plurality of springs 205 and displacement sensors 206 are installed in the pipe sleeve 203 and connected in series. The displacement sensor 206 is connected to the spring 205 through a rigid metal rod 207. The series connection sequence is one spring 205 connected to one displacement sensor 206 and the first and the last are both springs 205.

[0052] Furthermore, in the embodiment of the present application, the signal receiver 5 is connected to the computer 6 ; the signal receiver 5 and the computer 6 are arranged in the tunnel 9 outside the filling retaining wall 101 .

[0053] Specifically, the connectors of the connecting lines 7 of the displacement measuring device 2 , the stress measuring device 3 and the temperature measuring device 4 are led out to the signal receiver 5 through the filling retaining wall 101 , and then connected to the computer 6 . The signal receiver 5 and the computer 6 are located in the tunnel 9 outside the filling retaining wall 101 .

[0054] like Figure 4 As shown, in the embodiment of the present application, the soil pressure gauge 301 is composed of a pressure box 3011, a nut 3012, a connection module 3013, a connection ring 3014 and a connection line 7, and the initial parameters need to be adjusted before embedding.

[0055] The number of the displacement measuring devices 2 , the stress measuring devices 3 and the temperature measuring devices 4 is determined according to the measurement purpose, and their number is ≥1. The length of the connecting line 7 is also determined according to the measurement purpose.

[0056] like Figure 5 As shown, in the embodiment of the present application, a triaxial compression strength test device 11 is used to test the mechanical parameters of the filling body 1, the upper pressure plate 1101 and the lower pressure plate 1102 play the role of fixing the filling body sample 12, the vertical load 1103 and the confining pressure 1104 play the role of simulating the field stress, and the strength and deformation of the rock sample are measured under the three-dimensional pressure state. According to the Mohr-Coulomb strength theory, the compression strength envelope of the rock sample is drawn, and the parameters such as the compressive strength P, internal friction angle φ, cohesion C, elastic modulus E, Poisson's ratio λ, etc. of the filling body 1 are obtained.

[0057] like Figure 6As shown, in the embodiment of the present application, the moisture content test of the filling body 1 is to place the weighed filling body sample 12 in a drying oven 10, dry it for 12 hours, and the drying temperature range is 60±5°C. The sample is taken out of the drying oven 10, placed in a dryer and cooled to room temperature, and then the sample weight is weighed. The above steps are repeated every 2 hours until the error between two adjacent weighings is less than 0.1%. The moisture content ω of the filling body 1 is obtained by calculating the weight difference before and after drying.

[0058] like Figure 7 As shown, the scanned goaf model is imported into the numerical simulation software to form a numerical model, which can be established as an irregular model that conforms to the actual situation on site. The acquired engineering characteristic parameters of the filling body 1 are substituted into the numerical model, and the stress curve, displacement curve and plastic zone of the filling body 1 are extracted after the calculation of the simulation software until equilibrium is reached.

[0059] like Figure 8 As shown in the figure, the overall comprehensive analysis process of the curing effect of the filling body 1 is divided into three dimensions: indoor experiments, numerical simulations and field monitoring. The indoor experiments provide the numerical simulation with parameters such as the compressive strength P, tensile strength τ, and water content ω of the filling body 1. After the stress, displacement and plastic zone effect of the filling body 1 are obtained through numerical simulation, the displacement, pressure and temperature data curves obtained by field monitoring are combined with them to comprehensively evaluate the curing effect of the filling body 1.

[0060] Please also read Figures 1 to 8 According to one or more embodiments of the present application, the present application realizes comprehensive monitoring and analysis of the solidification process of the filling body 1 by combining three means: experimental research, numerical simulation and on-site monitoring. The method only requires sampling tests and on-site monitoring in typical mining areas, and uses numerical simulation software to establish a model of the entire mining area. Without the need to install large-scale monitoring devices, it can efficiently and low-costly evaluate the solidification effect of the filling body 1 in a large range of the entire mining area. It is particularly suitable for monitoring irregular and complex empty areas, and has strong applicability and economy.

[0061] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for monitoring cementation filling and curing process in a metal mine, characterized in that: It includes experimental research, numerical simulation and on-site monitoring; the experimental research includes filling body strength test, filling body mechanical parameter test and filling body moisture content test; the numerical simulation includes extracting the stress curve, displacement curve and plastic zone of the filling body under the simulated environment; the on-site monitoring includes displacement measurement, stress measurement and temperature measurement; it specifically includes the following steps: S1. Scan the goaf with a 3D scanner to obtain a goaf model, and install a displacement measuring device, a stress measuring device and a temperature measuring device in the goaf; S2. Lead the connectors of the connection lines of the displacement measuring device, the stress measuring device and the temperature measuring device to the tunnel outside the goaf, adjust the initial parameters of each device, establish a filling retaining wall and fill the goaf; S3. During the curing period of the filling body, the displacement, pressure and temperature data of the filling body are collected in real time to obtain the displacement, pressure and temperature change curves of the filling body respectively; S4. Conduct sampling test on the filling body inside the goaf to obtain the engineering characteristic parameters of the filling body; S5. Importing the goaf model obtained in step S1 into numerical simulation software to form a numerical model, substituting the engineering characteristic parameters of the filling body obtained in step S4 into the numerical model, and extracting the filling body stress curve, displacement curve and plastic zone after calculation by the simulation software until equilibrium is reached; S6. Combine the filling body displacement, pressure and temperature change curves obtained in step S3, the filling body engineering characteristic parameters obtained in step S4, and the filling body stress curve, displacement curve and plastic zone obtained in step S5 to comprehensively evaluate the filling body solidification effect.

2. The method for monitoring cementation filling and curing process in underground metal mines according to claim 1, characterized in that: The engineering characteristic parameters of the filling body include compressive strength, tensile strength, internal friction angle, cohesion, elastic modulus, Poisson's ratio and water content.

3. A monitoring system for cementing filling and solidification process in a metal mine, which adopts the monitoring method for cementing filling and solidification process in a metal mine according to claim 1 or 2 for monitoring, characterized in that: It includes a numerical model and a field monitoring device; the field monitoring device includes a displacement measuring device, a stress measuring device and a temperature measuring device installed in the filling body; the displacement measuring device, the stress measuring device and the temperature measuring device are connected to a signal receiver; the displacement measuring device includes a gripper, an extension rod, a pipe sleeve and a base connected in sequence from top to bottom, a plurality of springs and a plurality of displacement sensors are arranged inside the pipe sleeve, and the displacement sensors are connected in series with the springs through a rigid metal rod.

4. The metal mine underground cementing filling solidification process monitoring system according to claim 3 is characterized in that: The number of the springs is at least two, and the displacement sensor is arranged between the two springs.

5. The metal mine underground cementing filling solidification process monitoring system according to claim 4 is characterized in that: The first spring is connected to the bottom end of the extension rod through a rigid metal rod, and the last spring is connected to the bottom of the pipe sleeve through a rigid metal rod.

6. The metal mine underground cementing filling solidification process monitoring system according to claim 3 is characterized in that: The springs have the same elastic coefficient; the displacement sensors have the same elastic coefficient.

7. The metal mine underground cementing filling solidification process monitoring system according to claim 3 is characterized in that: The gripper is coupled to the roof of the goaf.

8. The metal mine underground cementing filling solidification process monitoring system according to claim 7 is characterized in that: The base is fixed on the bottom plate of the goaf.

9. The metal mine underground cementing filling solidification process monitoring system according to claim 3 is characterized in that: The signal receiver is connected to a computer; the signal receiver and the computer are arranged in a lane outside the filling retaining wall.

10. The metal mine underground cementing filling solidification process monitoring system according to claim 3, characterized in that: The stress measuring device includes an earth pressure gauge; the temperature measuring device includes a temperature sensor.

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