Device and method for simulating self-weight consolidation process of tailing filling slurry in high-ground-temperature stope

Abstract

The invention discloses a device and a method for simulating a self-weight consolidation process of tailing filling slurry in a high-ground-temperature stope. The device comprises a base; the model box is fixed to the top face of the base, the front side face of the model box is open, and the front side of the model box is detachably connected with a transparent cover plate; the two drainage assemblies are symmetrically arranged, drainage holes are formed in the two opposite side faces of the model box correspondingly, and the two drainage assemblies communicate with the drainage holes correspondingly; the heating system comprises a heating assembly mounted on the outer wall of the model box, and the heating assembly is connected with the temperature control assembly; the data acquisition system comprises a first pressure sensing unit, a second pressure sensing unit and a terminal controller; wherein the top of the model box is provided with a top cover, and the drainage hole is covered with a plugging layer. The self-weight consolidation and settlement process of the tailing filling slurry under different stope drainage conditions and different temperature fields can be studied, and support can be provided for formulating a safe and efficient filling scheme for a mine.

Description

Technical Field

[0001] The invention relates to the technical field of mining engineering, and in particular to a device and method for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area. Background Art

[0002] Backfill mining is currently widely used. With the exhaustion of shallow resources, most metal mines have gradually turned to underground mining. In the process of underground metal mining, as the depth increases, deep well mining faces a series of problems such as high stress, high geothermal, high osmotic pressure and strong mining disturbance. In the process of deep well mining, the temperature increases by an average of 1.7 to 3°C for every 100m increase in mining depth underground. Obviously, the high geothermal environment will inevitably affect the mechanical properties of the cemented backfill, causing the backfill to be damaged, thereby increasing the mining cost. Therefore, the high geothermal environment is a problem that underground mining will have to face in the future. Therefore, it is of great significance to explore the mechanical properties of the cemented backfill under the action of high geothermal for deep mining of mines. With the increasing mining depth, the geothermal gradient will cause the temperature of the backfill environment to continue to rise, and the temperature field will have a more prominent effect on the characteristics and evolution of the backfill behavior. The duration of the consolidation and settlement process of the full tailings backfill slurry in different temperature fields is different, which affects the efficiency and safety of the backfill process. If the consolidation and settlement properties of tailings slurry are not well understood, and the consolidation state of tailings slurry in the mining area cannot be effectively evaluated, it will easily lead to major safety accidents such as retaining wall collapse and tailings slurry flooding the tunnel. Therefore, it is very important to study and determine the consolidation properties of mine tailings slurry in different temperature fields to optimize and formulate a reasonable filling plan.

[0003] The geothermal gradient will cause the temperature of the filling environment in the mine to continue to rise, resulting in increased safety risks and difficulties in installing monitoring instruments in the empty areas of the underground mine. In order to arrange sensors at different heights in the empty areas of the mine, personnel and equipment may be exposed to construction work in the empty areas with higher temperatures, which increases the safety risk of being hit by falling debris and the physical discomfort caused by the temperature. For empty areas in mine mines, in-situ monitoring is adopted, and the mine will be completely filled, making it impossible to conduct repeated tests. In-situ monitoring of mine mines consumes a lot of manpower and material resources, and will also affect surrounding and subsequent work activities. Based on this, the present invention provides a device and method for simulating the self-weight consolidation process of tailings filling slurry in high geothermal mines. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area, so as to solve the problems existing in the prior art.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area, comprising:

[0006] Base;

[0007] A model box, wherein the model box is fixed to the top surface of the base, the front side of the model box is open, and a transparent cover plate is detachably connected to the front side of the model box;

[0008] Drainage components, wherein two groups of the drainage components are symmetrically arranged, and drainage holes are respectively opened on two opposite sides of the model box, and the two groups of the drainage components are respectively connected to the drainage holes;

[0009] A heating system, the heating system comprising a heating component mounted on the outer wall of the model box, the heating component being connected to a temperature control component;

[0010] A data acquisition system, the data acquisition system comprising a first pressure sensing unit and a second pressure sensing unit, the first pressure sensing unit being mounted on a side wall of the model box, and the second pressure sensing unit being mounted on a bottom of the model box;

[0011] A terminal controller, the temperature control component, the first pressure sensing unit and the second pressure sensing unit are all electrically connected to the terminal controller;

[0012] Wherein, a top cover is installed on the top of the model box, and a blocking layer is covered on the drainage hole.

[0013] According to the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area provided by the present invention, a wing plate is fixed to the front side of the model box, the wing plate is fixedly connected to the transparent cover plate by bolts, and a sealing layer is arranged between the wing plate and the transparent cover plate.

[0014] According to the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area provided by the present invention, the drainage assembly includes a drainage pipe and a water collecting bucket, the drainage pipe is fixedly connected to the drainage hole, the water collecting bucket is placed on the side of the base, and the drainage pipe is arranged corresponding to the top of the water collecting bucket.

[0015] According to the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area provided by the present invention, the first pressure sensing unit includes a first pore water pressure sensor and a second pore water pressure sensor, the first pore water pressure sensor and the second pore water pressure sensor are both electrically connected to a first data collector, and the first data collector is electrically connected to the terminal controller; the first pore water pressure sensor is installed on the inner wall of the model box, and the second pore water pressure sensor is installed on the bottom wall of the model box.

[0016] According to the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area provided by the present invention, the distance between the first pore water pressure sensor and the bottom of the model box is 60 cm, and the distance between the second pore water pressure sensor and the bottom of the model box is 5 cm.

[0017] According to the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area provided by the present invention, the second pressure sensing unit includes a conductivity sensor, the conductivity sensor is suspended in the model box, the conductivity sensor is electrically connected to the second data collector, and the second data collector is electrically connected to the terminal controller.

[0018] According to the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area provided by the present invention, the distance between the conductivity sensor and the bottom wall of the model box is 50 cm.

[0019] According to the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area provided by the present invention, the heating system includes a heating plate fixed on the outer wall of the model box, the heating plate is connected to the temperature control component, and the distance between the temperature control component and the top of the model box is 20 cm.

[0020] According to the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area provided by the present invention, scale lines are arranged on the transparent cover plate.

[0021] The method for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area comprises the following steps:

[0022] Step 1: Install the first pressure sensing unit and the second pressure sensing unit in the model box respectively, and install the heating assembly on the model box;

[0023] Step 2: quantitatively prepare the required filling slurry according to the mass concentration of the tailings filling slurry and the lime-sand ratio in the simulated high geothermal mining area, and cover the drainage hole with a plugging layer;

[0024] Step 3: Control the temperature by means of a temperature control component, and pour the prepared slurry into the model box along the inner wall of the model box in a single time or in multiple times after a preset time interval;

[0025] Step 4, collecting data from the first pressure sensing unit, the second pressure sensing unit and the temperature control unit, recording the amount of subsidence of the top of the slurry, storing the data through the terminal controller, and simulating the slurry consolidation and sedimentation process under different temperature conditions;

[0026] Step 5: The water in the slurry seeps out through the plugging layer, the discharged water is collected by the drainage component, and the volume of the discharged water is recorded by a measuring cylinder to simulate the slurry consolidation and settlement process under different boundary drainage conditions.

[0027] The present invention discloses the following technical effects:

[0028] The simulation device of the present invention is reusable, and the data is accurate. The test device is easy to operate, low in cost, and low in safety risk. During the test, by adjusting the experimental drainage boundary and temperature, the simulated experimental environment of the tailings slurry is more consistent with the actual mining site, and the disturbance by the sensor is small. The evolution process and law of pore water pressure, conductivity, matrix suction, slurry drainage and settlement over time during the self-weight consolidation of the tailings filling slurry can be accurately monitored, and then the self-weight consolidation and settlement process of the tailings filling slurry under different mining site drainage conditions and different temperature fields can be studied, which can provide support for the mine to formulate a safe and efficient filling plan. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic structural diagram of a device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area according to the present invention;

[0031] Figure 2 It is a schematic diagram of the matching relationship between the model box and the transparent cover plate of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the base of the present invention.

[0033] Among them, 1. base; 2. model box; 3. transparent cover; 4. wing plate; 5. bolts; 6. sealing layer; 7. drain pipe; 8. water collecting bucket; 9. first pore water pressure sensor; 10. second pore water pressure sensor; 11. first data collector; 12. conductivity sensor; 13. second data collector; 14. heating plate; 15. temperature control component. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments 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.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figure 1-Figure 3 The present invention provides a device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area, comprising:

[0037] Base 1;

[0038] A model box 2, the model box 2 is fixed on the top surface of the base 1, the front side of the model box 2 is open, and the front side of the model box 2 is detachably connected with a transparent cover plate 3;

[0039] Drainage components, two groups of drainage components are symmetrically arranged, and drainage holes are respectively opened on two opposite sides of the model box 2, and the two groups of drainage components are respectively connected to the drainage holes;

[0040] A heating system, the heating system includes a heating component installed on the outer wall of the model box 2, and the heating component is connected to the temperature control component 15;

[0041] A data acquisition system, the data acquisition system comprises a first pressure sensing unit and a second pressure sensing unit, the first pressure sensing unit is mounted on the side wall of the model box 2, and the second pressure sensing unit is mounted on the bottom of the model box 2;

[0042] The terminal controller, the temperature control component 15, the first pressure sensing unit and the second pressure sensing unit are all electrically connected to the terminal controller;

[0043] Wherein, a top cover is installed on the top of the model box 2, and a sealing layer is covered on the drainage hole.

[0044] The sealing layer includes a silicone rubber pad and a geotextile. The model box 2 is made of stainless steel, and the transparent cover plate 3 is made of polycarbonate.

[0045] According to a further optimization scheme, a wing plate 4 is fixed to the front side of the model box 2 , the wing plate 4 and the transparent cover plate 3 are fixedly connected by bolts 5 , and a sealing layer 6 is provided between the wing plate 4 and the transparent cover plate 3 .

[0046] According to a further optimized solution, the drainage assembly includes a drainage pipe 7 and a water collecting bucket 8. The drainage pipe 7 is fixedly connected to the drainage hole. The water collecting bucket 8 is placed on the side of the base 1. The drainage pipe 7 and the top of the water collecting bucket 8 are correspondingly arranged.

[0047] Further optimized, the first pressure sensing unit includes a first pore water pressure sensor 9 and a second pore water pressure sensor 10, the first pore water pressure sensor 9 and the second pore water pressure sensor 10 are both electrically connected to the first data collector 11, and the first data collector 11 is electrically connected to the terminal controller; the first pore water pressure sensor 9 is installed on the inner wall of the model box 2, and the second pore water pressure sensor 10 is installed on the bottom wall of the model box 2.

[0048] According to a further optimization scheme, the distance between the first pore water pressure sensor 9 and the bottom of the model box 2 is 60 cm, and the distance between the second pore water pressure sensor 10 and the bottom of the model box 2 is 5 cm.

[0049] According to a further optimized solution, the second pressure sensing unit includes a conductivity sensor 12, the conductivity sensor 12 is suspended in the model box 2, the conductivity sensor 12 is electrically connected to the second data collector 13, and the second data collector 13 is electrically connected to the terminal controller.

[0050] According to a further optimization scheme, the distance between the conductivity sensor 12 and the bottom wall of the model box 2 is 50 cm.

[0051] According to a further optimized solution, the heating system includes a heating plate 14 fixed on the outer wall of the model box 2, the heating plate 14 is connected to a temperature control component 15, and the distance between the temperature control component 15 and the top of the model box 2 is 20 cm. The temperature control component 15 includes a digital display temperature controller.

[0052] According to a further optimized solution, scale lines are provided on the transparent cover plate 3 .

[0053] The method for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area comprises the following steps:

[0054] Step 1: install the first pressure sensing unit and the second pressure sensing unit in the model box 2 respectively, and install the heating component on the model box 2;

[0055] Step 2: quantitatively prepare the required filling slurry according to the mass concentration of the tailings filling slurry and the lime-sand ratio in the simulated high geothermal mining area, and cover the drainage hole with a plugging layer;

[0056] Step 3: Control the temperature through the temperature control component 15, and pour the prepared slurry into the model box 2 along the inner wall of the model box 2 in a single time or in multiple times after a preset time interval;

[0057] Step 4, collecting data from the first pressure sensing unit, the second pressure sensing unit and the temperature control unit, recording the amount of slurry top subsidence, storing the data through the terminal controller, and simulating the slurry consolidation and sedimentation process under different temperature conditions;

[0058] Step 5: The water in the slurry seeps out through the plugging layer, the discharged water is collected by the drainage component, and the volume of the discharged water is recorded by a measuring cylinder to simulate the slurry consolidation and settlement process under different boundary drainage conditions.

[0059] The simulation device of the present invention is reusable, and the data is accurate. The test device is easy to operate, low in cost, and low in safety risk. During the test, by adjusting the experimental drainage boundary and temperature, the simulated experimental environment of the tailings slurry is more consistent with the actual mining site, and the disturbance by the sensor is small. The evolution process and law of pore water pressure, conductivity, matrix suction, slurry drainage and settlement over time during the self-weight consolidation of the tailings filling slurry can be accurately monitored, and then the self-weight consolidation and settlement process of the tailings filling slurry under different mining site drainage conditions and different temperature fields can be studied, which can provide support for the mine to formulate a safe and efficient filling plan.

[0060] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0061] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for simulating the self-weight consolidation process of tailings filling slurry in high geothermal mining areas, characterized in that: include: Base (1); A model box (2), the model box (2) being fixed on the top surface of the base (1), the front side of the model box (2) being open, and the front side of the model box (2) being detachably connected to a transparent cover plate (3); Drainage components, wherein two groups of the drainage components are symmetrically arranged, and drainage holes are respectively opened on two opposite sides of the model box (2), and the two groups of drainage components are respectively connected to the drainage holes; A heating system, the heating system comprising a heating component installed on the outer wall of the model box (2), the heating component being connected to a temperature control component (15); A data acquisition system, the data acquisition system comprising a first pressure sensing unit and a second pressure sensing unit, the first pressure sensing unit being mounted on a side wall of the model box (2), and the second pressure sensing unit being mounted on a bottom of the model box (2); A terminal controller, the temperature control component (15), the first pressure sensing unit and the second pressure sensing unit are all electrically connected to the terminal controller; Wherein, a top cover is installed on the top of the model box (2), and a blocking layer is covered on the drainage hole.

2. The device for simulating the self-weight consolidation process of tailings filling slurry in high geothermal mining areas according to claim 1 is characterized in that: A wing plate (4) is fixed to the front side of the model box (2); the wing plate (4) and the transparent cover plate (3) are fixedly connected via bolts (5); and a sealing layer (6) is provided between the wing plate (4) and the transparent cover plate (3).

3. The device for simulating the self-weight consolidation process of tailings filling slurry in high geothermal mining areas according to claim 1, characterized in that: The drainage assembly comprises a drainage pipe (7) and a water collecting bucket (8); the drainage pipe (7) is fixedly connected to the drainage hole; the water collecting bucket (8) is placed on the side of the base (1); and the drainage pipe (7) and the top end of the water collecting bucket (8) are arranged correspondingly.

4. The device for simulating the self-weight consolidation process of tailings filling slurry in high geothermal mining areas according to claim 1, characterized in that: The first pressure sensing unit comprises a first pore water pressure sensor (9) and a second pore water pressure sensor (10); the first pore water pressure sensor (9) and the second pore water pressure sensor (10) are both electrically connected to a first data acquisition device (11); and the first data acquisition device (11) is electrically connected to the terminal controller; the first pore water pressure sensor (9) is mounted on the inner wall of the model box (2), and the second pore water pressure sensor (10) is mounted on the bottom wall of the model box (2).

5. The device for simulating the self-weight consolidation process of tailings filling slurry in high geothermal mining areas according to claim 4, characterized in that: The distance between the first pore water pressure sensor (9) and the bottom of the model box (2) is 60 cm, and the distance between the second pore water pressure sensor (10) and the bottom of the model box (2) is 5 cm.

6. The device for simulating the self-weight consolidation process of tailings filling slurry in high geothermal mining areas according to claim 1, characterized in that: The second pressure sensing unit comprises a conductivity sensor (12), the conductivity sensor (12) is suspended in the model box (2), the conductivity sensor (12) is electrically connected to a second data collector (13), and the second data collector (13) is electrically connected to the terminal controller.

7. The device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area according to claim 6, characterized in that: The distance between the conductivity sensor (12) and the bottom wall of the model box (2) is 50 cm.

8. The device for simulating the self-weight consolidation process of tailings filling slurry in high geothermal mining areas according to claim 1, characterized in that: The heating system comprises a heating plate (14) fixed on the outer wall of the model box (2), the heating plate (14) is connected to the temperature control component (15), and the distance between the temperature control component (15) and the top of the model box (2) is 20 cm.

9. The device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area according to claim 1, characterized in that: The transparent cover plate (3) is provided with scale lines.

10. A method for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area, based on the device for simulating the self-weight consolidation process of tailings filling slurry in a high geothermal mining area according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: installing the first pressure sensing unit and the second pressure sensing unit in the model box (2) respectively, and installing the heating component on the model box (2); Step 2: quantitatively prepare the required filling slurry according to the mass concentration of the tailings filling slurry and the lime-sand ratio in the simulated high geothermal mining area, and cover the drainage hole with a plugging layer; Step 3, controlling the temperature through the temperature control component (15), pouring the prepared slurry into the model box (2) along the inner wall of the model box (2) in a single batch or in multiple batches after a preset time interval; Step 4, collecting data from the first pressure sensing unit, the second pressure sensing unit and the temperature control unit, recording the amount of subsidence of the top of the slurry, storing the data through the terminal controller, and simulating the slurry consolidation and sedimentation process under different temperature conditions; Step 5: The water in the slurry seeps out through the plugging layer, the discharged water is collected by the drainage component, and the volume of the discharged water is recorded by a measuring cylinder to simulate the slurry consolidation and settlement process under different boundary drainage conditions.

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