Test device and method for filling slurry pouring, flow pattern and mechanical strength evolution

Abstract

The present invention provides a device and method for testing the falling, flow morphology and mechanical strength evolution of filling slurry. The device comprises a filling slurry preparation module, a physical simulation module, a trajectory capture module, and a drilling sampling and observation module. Through the setting of the filling slurry preparation module, the physical simulation module, the trajectory capture module, the drilling sampling and observation module and the corresponding test steps, the free falling and planar flow trajectories of the filling slurry at high altitudes can be analyzed, thereby revealing the material segregation evolution characteristics in the vertical falling and planar flow processes of the subsequent filling slurry in high and large voids, and exploring the strength distribution law of the filling body in the void associated with the slurry segregation. The test is reasonable and highly reliable, and provides a theoretical basis and technical support for the design and quality control work related to the subsequent filling mining method in high and large voids.

Description

Technical Field

[0001] The invention relates to the technical field of filling mining, and in particular to a filling slurry pouring, flow form and mechanical strength evolution test device and method. Background Art

[0002] The quality of the filling body, especially the strength of the filling body, is an important safety, economic and technical indicator that affects the cost and safety of the filling mining method. Under the conditions that the filling material is determined, the ash-sand ratio, mass concentration and filling environment remain unchanged, the segregation degree of the filling slurry is an important factor that determines the quality of the filling body, especially the strength of the filling body. The segregation of the filling slurry is not only easy to cause transportation accidents such as pipe blockage, but also causes the stratification of the filling body and even the formation of mud layers, resulting in non-solidification, resulting in the reduction of local strength of the filling body, the deterioration of integrity, and the failure to play a supporting role, causing safety accidents. Although segregation will occur during the mixing of the mixture (aggregate and cementitious material), pipeline transportation, paving in the goaf or mining area, and solidification of the filling body, segregation mainly occurs during the flow of the slurry. In particular, it occurs when the slurry is discharged from the pipeline and falls vertically to the mining area or goaf to be filled, and in the plane flow process from the drop point to the surrounding area. Unlike the layered filling, where the material is dumped at a low height and slurry segregation mainly occurs during the flow along the stope or goaf, the height of the goaf for subsequent filling of empty spaces reaches 50 to 100 meters. Most of the material discharge points for subsequent filling of large empty spaces are located above the goaf, and the slurry vertically drops to a large height. The segregation of the slurry during the vertical drop is very serious. After the slurry is poured from a high altitude into the goaf, the mixture (aggregate, cementitious material, and even water) has already segregated, which has an even greater impact on the strength distribution law of the filling body. Therefore, the evolution characteristics of the slurry segregation and the strength distribution law of the filling body in the subsequent filling of large goafs are essentially different from those of layered filling. Summary of the invention

[0003] The purpose of the present invention is: to address the problems in the above-mentioned background technology, to provide a scheme that can analyze the free fall and plane flow trajectory of filling slurry at high altitudes, reveal the material segregation evolution characteristics during the vertical fall and plane flow of subsequent filling slurry in large and high voids, and explore the strength distribution law of the filling body in the void associated with slurry segregation, so as to provide a theoretical basis and technical support for the design and quality control work related to the subsequent filling mining method in large and high voids.

[0004] In order to achieve the above-mentioned object, the present invention provides a filling slurry pouring, flow morphology and mechanical strength evolution test device, including a filling slurry preparation module, a physical simulation module, a trajectory capture module, and a drilling sampling and observation module;

[0005] The filling slurry preparation module comprises a stirring barrel, a slurry outlet pipe, a valve and a vacuum pump. The stirring barrel is used to prepare homogeneous filling slurry. The inlet end of the slurry outlet pipe is connected to the stirring barrel, and the outlet end of the slurry outlet pipe is arranged at a slurry drop point. The valve and the vacuum pump are both arranged on the slurry outlet pipe.

[0006] The physical simulation module includes a model box, the slurry drop point is arranged above the model box, and the model box is provided with a water filtering structure;

[0007] The trajectory capture module includes a high-speed camera mounted on one side of the model box, and the high-speed camera is used to capture the vertical movement trajectory of the marker particles in the filling slurry;

[0008] The borehole sampling and observation module includes a borehole television analyzer and a borehole sampler. The borehole television analyzer is used to analyze the layered interface conditions of the filling body along the filling depth direction, and the borehole sampler is used to sample the filling body after solidification and curing in the model box.

[0009] Furthermore, the model box is surrounded by a transparent acrylic plate, the acrylic plate can be disassembled, and the water filtration structure includes water filtration holes and geotextile.

[0010] Furthermore, the model box is used as a similar physical model of a large stope, and the size of the similar physical model of a large stope is calculated and determined according to the three similarity theorems, which are: similarity of geometric conditions, similarity of kinematic conditions, similarity of dynamic conditions and similarity of boundary conditions, and the geometric similarity ratio λ=H between the actual stope and the similar physical model of the large stope is obtained. p / H m .

[0011] Furthermore, the height position of the slurry landing point can be adjusted.

[0012] The present invention also provides a filling slurry pouring, flow morphology and mechanical strength evolution test method, using the filling slurry pouring, flow morphology and mechanical strength evolution test device as described above, including the following steps:

[0013] S1, preparing a homogeneous filling slurry in a mixing barrel, opening a valve and pumping the homogeneous filling slurry into a model box through a vacuum pump;

[0014] S2, after the homogeneous filling slurry flows out stably from the slurry falling point, turn on the high-speed camera to capture the vertical motion trajectory of the marker particles in the filling slurry, determine the falling speed and motion trajectory of each component in the filling slurry, study the segregation law of the filling slurry in the vertical direction, and quantitatively determine the vertical segregation degree of the filling slurry;

[0015] S3, when the filling slurry in the model box reaches a preset height, pumping is stopped, and after the filling body in the model box solidifies and is cured for a preset time, the stratified interface of the filling body along the filling depth direction is analyzed using a borehole television analyzer to fit the slurry sedimentation liquid level curve;

[0016] S4, using a borehole sampler to drill filling body samples, measure the compressive strength and tensile strength, analyze the plane strength distribution law of the filling body in the goaf, and invert the segregation characteristics of the filling slurry along the slurry flow direction;

[0017] S5. Establish a quantitative relationship model between slurry segregation and vertical drop height and horizontal flow distance under given filling materials, proportion parameters and rheological parameters. Invert the correlation model between the plane and vertical filling strength of the goaf and the corresponding slurry segregation, and reveal the strength distribution law of the filling in the three-dimensional space of the goaf.

[0018] Furthermore, the flow rate of the filling slurry needs to be determined in S1, which is determined according to the Froude similarity criterion.

[0019] Furthermore, the method for determining the vertical segregation law and vertical segregation degree in S2 is as follows: according to the high-speed camera data, the falling height H is divided into n segments, and the area q occupied by the interface marker particles in each segment is measured. n With the interface area s n The ratio of the vertical segregation in the segment is defined as q n / s n , thus the overall vertical segregation of the slurry is

[0020] Furthermore, in S2, the least squares fitting formula is used, with the filling parameters and the pouring height of the filling slurry as input variables and the vertical segregation as output, to obtain a quantitative relationship between the vertical segregation and the filling parameters and the pouring height of the filling slurry.

[0021] Furthermore, after the backfill in S3 is cured, it is divided into several areas along the slurry flow direction. In each area, the stratification phenomenon of the backfill is statistically analyzed using a borehole television analyzer, and the slope equations of each layer are fitted. According to the segregation of the backfill in the mining field model, the backfill in each borehole is uniformly divided into several layers, and the height distribution range of each layer is recorded separately. Then, the height distribution range of each layer in each borehole is reflected in a two-dimensional coordinate system, and the slope curve equation of each layer height versus slurry flow length is fitted and drawn.

[0022] Furthermore, in S4, samples were drilled in each partition to measure their uniaxial compressive strength and tensile strength after curing. The flow distance from the slurry drop point was used as the independent variable, and the distribution law of the compressive strength and tensile strength of the filling body with the flow distance of the filling slurry was fitted and established.

[0023] The above scheme of the present invention has the following beneficial effects:

[0024] The device and method for testing the falling, flow morphology and mechanical strength evolution of filling slurry provided by the present invention can analyze the free falling and plane flow trajectory of filling slurry at high altitudes through the setting of filling slurry preparation module, physical simulation module, trajectory capture module, drilling sampling and observation module and corresponding test steps, thereby revealing the material segregation evolution characteristics in the vertical falling and plane flow process of the subsequent filling slurry in the high and large voids, and exploring the strength distribution law of the filling body in the void associated with slurry segregation. The test is reasonable and highly reliable, providing a theoretical basis and technical support for the design and quality control of the subsequent filling mining method in the high and large voids.

[0025] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall schematic diagram of the device of the present invention;

[0027] Figure 2 It is a curve diagram of slurry sedimentation liquid level in an embodiment of the present invention;

[0028] Figure 3 It is a slope curve diagram of each layer height versus slurry flow length in the embodiment of the present invention.

[0029] [Description of Reference Numerals]

[0030] 10-filling slurry preparation module; 11-mixing barrel; 12-slurry outlet pipe; 13-valve; 14-vacuum pump; 20-physical simulation module; 21-model box; 22-water filtration structure; 30-trajectory capture module; 31-high-speed camera; 40-borehole sampling and observation module; 41-borehole television analyzer; 42-borehole sampler. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described more comprehensively with reference to the relevant drawings below. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many other different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, 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 application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0036] like Figure 1 As shown, an embodiment of the present invention provides a filling slurry pouring, flow morphology and mechanical strength evolution test device, including a filling slurry preparation module 10, a physical simulation module 20, a trajectory capture module 30, and a drilling sampling and observation module 40.

[0037] Among them, the filling slurry preparation module 10 includes a mixing barrel 11, a slurry outlet pipe 12, a valve 13, and a vacuum pump 14. An agitator is provided in the mixing barrel 11, and a homogeneous filling slurry of a certain concentration is prepared in the mixing barrel 11. The inlet end of the slurry outlet pipe 12 is connected to the mixing barrel 11, and the outlet end is arranged at the slurry drop point of the model box 21 of the physical simulation module 20, and the height position of the slurry drop point can be adjusted. The valve 13 and the vacuum pump 14 are both arranged on the slurry outlet pipe 12, and are respectively used to control the opening and closing of the slurry outlet pipe 12 and the pumping of the filling slurry.

[0038] In this embodiment, the model box 21 of the physical simulation module 20 is made of a transparent acrylic plate. As a similar physical model of a tall and large mining site, the filling slurry falls into the model box 21 from the slurry drop point, and the acrylic plate can be easily disassembled and assembled to facilitate sampling and multiple tests, and is also convenient for observation. At the same time, the box wall of the model box 21 is provided with water filtration holes, geotextiles and other water filtration structures 22 for filtering water. It should be noted that the size of the similar physical model of the tall and large mining site needs to be calculated and determined according to the three similarity theorems. The three similarity theorems are: similarity of geometric conditions, similarity of kinematic conditions, similarity of dynamic conditions and similarity of boundary conditions, and finally the geometric similarity ratio λ=H between the actual mining site and the similar physical model of the tall and large mining site is obtained. p / Hm .

[0039] The trajectory capture module 30 includes a high-speed camera 31 mounted on one side of the model box 21. The high-speed camera 31 is mounted on a height-adjustable tripod to maintain a suitable height, and is used to capture the vertical motion trajectory of the marker particles in the filling slurry, so as to study the segregation law of the filling slurry in the vertical direction. The borehole sampling and observation module 40 includes a borehole television analyzer 41 and a borehole sampler 42. The borehole television analyzer 41 is used to analyze the stratified interface of the filling body along the filling depth direction, so as to invert the segregation characteristics of the filling slurry along the flow direction; the borehole sampler 42 is used to sample the filling body after solidification and curing in the model box 21, measure the compressive strength and tensile strength, and analyze the plane strength distribution law of the filling body in the goaf area.

[0040] When using the test device provided in this embodiment, the test is carried out through the following steps:

[0041] S1, put a certain proportion of marked particles, filling aggregates, filling cementitious materials, and city tap water into the mixing barrel 11, set the constant stirring rate of the agitator, stir for 5 to 10 minutes to form a homogeneous filling slurry, open the valve 13 and pump the homogeneous filling slurry into the model box 21 through the vacuum pump 14.

[0042] In this step, the flow rate of the filling slurry needs to be determined according to the Froude (gravity) similarity criterion, which is as follows: In order to keep the two flow systems similar under the action of gravity, the ratio of the inertial force of the fluid to the gravity must be equal, that is, the Froude number must be equal:

[0043]

[0044] Fr p =Fr m ,Right now

[0045] Where Fr is the Froude number; μ is the velocity of the fluid, m / s; g is the acceleration due to gravity, m / s 2 ; H is the characteristic size of the flow field, m; Fr p , μ p , H p are the Froude number, flow velocity and characteristic size of the flow field of the filling slurry in actual working conditions; Fr m , μ m , H m are the Froude number, flow velocity and characteristic size of the filling slurry during the test. The flow velocity of the filling slurry during the test can be calculated according to the above two formulas.

[0046] S2, after the homogeneous filling slurry flows out stably from the slurry falling point, turn on the high-speed camera 31 to capture the vertical movement trajectory of the marker particles in the filling slurry, determine the falling speed and movement trajectory of each component in the filling slurry, study the segregation law of the filling slurry in the vertical direction, and quantitatively determine the vertical segregation degree of the filling slurry.

[0047] In this step, the vertical segregation law and vertical segregation degree are determined by dividing the falling height H into n segments according to the high-speed camera data, and measuring the area q occupied by the interface marker particles in each segment. n With the interface area s n The ratio of the vertical segregation in the segment is defined as q n / s n , thus the overall vertical segregation of the slurry is

[0048] At the same time, the least squares fitting formula is used to obtain the quantitative relationship between the vertical segregation and the viscosity coefficient, yield stress, material density and pouring height of the filling slurry, with the filling parameters such as viscosity coefficient, yield stress, material density and pouring height of the filling slurry as input variables and the vertical segregation as output, thereby revealing the evolution characteristics of the vertical segregation with pouring height under different filling parameters.

[0049] S3, when the filling slurry in the model box 21 reaches a certain height, stop pumping. After the filling body in the model box 21 solidifies and cures for 28 days, use the drilling television analyzer 41 to analyze the stratified interface of the filling body along the filling depth direction, and fit the slurry sedimentation liquid level curve.

[0050] In this step, the method for determining the stratification characteristics of the filling slurry along the slurry flow direction is as follows: after the filling body is cured, it is divided into several areas along the slurry flow direction. In each area, the stratification phenomenon of the filling body is statistically analyzed using a borehole television analyzer 41, and the slope equations of each stratification are fitted, such as Figure 2 As shown. At the same time, the borehole television analyzer 41 divides the filling body in each borehole into three layers according to the segregation of the filling body in the stope model, namely, the gray sand aggregation layer at the top, the fine aggregate layer in the middle, and the coarse aggregate layer at the bottom. And the height distribution range of each layer is recorded separately, namely, the bottom height and the top height. Then, the height distribution range of the three layers in each borehole is reflected in the two-dimensional coordinate system, and the slope curve equation of each layer height versus slurry flow length is fitted and drawn, as shown in Figure 3 shown.

[0051] It should be noted that, since the model box 21 is in a three-dimensional coordinate system, when recording the layer height of each ordinate position, two or more points along the abscissa position are averaged. Considering that the lateral height difference does not change much, this method can also simplify the analysis process.

[0052] S4, using the borehole sampler 42 to drill the filling body sample, measure its compressive strength and tensile strength, analyze the plane strength distribution law of the filling body in the goaf, and then invert the segregation characteristics of the filling slurry along the slurry flow direction.

[0053] In this step, samples are drilled in each partition to measure their uniaxial compressive strength and tensile strength after curing. The flow distance from the slurry drop point is used as the independent variable, and the distribution law of the compressive strength and tensile strength of the filling body with the flow distance of the filling slurry is fitted and established.

[0054] In this embodiment, the percentage of the horizontal distance of the drilling sampling position from the far point to the entire similar mining field length is the Origin software X-coordinate, the compressive strength / tensile strength of 2 to 3 samples on the same vertical coordinate is the Origin software Y-coordinate (take the average value), and a strength distribution diagram of the filling body along the slurry flow direction is drawn, and the Origin software is used to fit the strength distribution law of the filling body along the slurry direction.

[0055] At the same time, the average compressive strength / tensile strength of all filling body test blocks along the slurry flow direction is obtained as the standard strength value of the filling body, and the percentage difference between the average compressive strength / tensile strength of 2 to 3 filling body test blocks on the same ordinate and the standard strength value of the filling body is used as the slurry segregation in the slurry flow direction (horizontal direction). Similarly, the horizontal distance of the sampling borehole position from the far point to the percentage of the entire similar stope length is used as the Origin software X coordinate, and the slurry segregation is used as the Origin software Y coordinate. The distribution law of the slurry segregation along the slurry flow direction is drawn, and the Origin software is used to fit the distribution law of the slurry segregation along the slurry direction. Therefore, the segregation characteristics of the filling slurry along the slurry flow direction can be inverted.

[0056] S5. Establish a quantitative relationship model between slurry segregation and vertical drop height and horizontal flow distance under given filling materials, proportion parameters and rheological parameters. Invert the correlation model between the plane and vertical filling strength of the goaf and the corresponding slurry segregation, and reveal the strength distribution law of the filling in the three-dimensional space of the goaf.

[0057] In summary, through the test device and method for the pouring, flow pattern and mechanical strength evolution of filling slurry provided in this embodiment, it is possible to analyze the free fall of filling slurry at a high altitude and the plane flow trajectory, thereby revealing the material segregation evolution characteristics in the vertical fall and plane flow of subsequent filling slurry in large voids, and exploring the strength distribution law of the filling body in the void associated with slurry segregation. The experiment is reasonable and highly reliable, providing a theoretical basis and technical support for the design and quality control work related to the subsequent filling mining method in large voids.

[0058] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A filling slurry pouring, flow pattern and mechanical strength evolution test device, characterized in that: It comprises a filling slurry preparation module (10), a physical simulation module (20), a trajectory capture module (30), and a drilling sampling and observation module (40); The filling slurry preparation module (10) comprises a stirring barrel (11), a slurry outlet pipe (12), a valve (13) and a vacuum pump (14); the stirring barrel (11) is used to prepare a homogeneous filling slurry; the inlet end of the slurry outlet pipe (12) is connected to the stirring barrel (11); the outlet end of the slurry outlet pipe (12) is arranged at a slurry drop point; the valve (13) and the vacuum pump (14) are both arranged on the slurry outlet pipe (12); The physical simulation module (20) comprises a model box (21), the slurry drop point is arranged above the model box (21), and the model box (21) is provided with a water filtering structure (22); The trajectory capture module (30) comprises a high-speed camera (31) mounted on one side of the model box (21), and the high-speed camera (31) is used to capture the vertical movement trajectory of the marker particles in the filling slurry; The borehole sampling and observation module (40) comprises a borehole television analyzer (41) and a borehole sampler (42), wherein the borehole television analyzer (41) is used to analyze the layered interface conditions of the filling body along the filling depth direction, and the borehole sampler (42) is used to sample the filling body after solidification and curing in the model box (21).

2. The filling slurry pouring, flow pattern and mechanical strength evolution test device according to claim 1 is characterized in that: The model box (21) is surrounded by a transparent acrylic plate, and the acrylic plate can be disassembled. The water filtering structure (22) includes water filtering holes and geotextile.

3. The filling slurry pouring, flow pattern and mechanical strength evolution test device according to claim 1 is characterized in that: The model box (21) is used as a similar physical model of a large stope. The size of the similar physical model of the large stope is calculated and determined according to the three similarity theorems. The three similarity theorems are: similarity of geometric conditions, similarity of kinematic conditions, similarity of dynamic conditions and similarity of boundary conditions. The geometric similarity ratio λ=H between the actual stope and the similar physical model of the large stope is obtained. p / H m , H p is the characteristic dimension of the flow field of the filling slurry in actual working conditions, H m It is the characteristic dimension of the flow field of the filling slurry during the test.

4. The filling slurry pouring, flow pattern and mechanical strength evolution test device according to claim 1 is characterized in that: The height position of the slurry landing point can be adjusted.

5. A filling slurry pouring, flow pattern and mechanical strength evolution test method, using the filling slurry pouring, flow pattern and mechanical strength evolution test device as claimed in any one of claims 1 to 4, characterized in that: The steps include: S1, preparing a homogeneous filling slurry in a stirring barrel (11), opening a valve (13) and pumping the homogeneous filling slurry into a model box (21) through a vacuum pump (14); S2, after the homogeneous filling slurry flows out stably from the slurry falling point, a high-speed camera (31) is turned on to capture the vertical motion trajectory of the marker particles in the filling slurry, determine the falling speed and motion trajectory of each component in the filling slurry, study the segregation law of the filling slurry in the vertical direction, and quantitatively determine the vertical segregation degree of the filling slurry; S3, when the filling slurry in the model box (21) reaches a preset height, pumping is stopped, and after the filling body in the model box (21) solidifies and is cured for a preset time, the stratified interface of the filling body along the filling depth direction is analyzed using a borehole television analyzer (41), and a slurry sedimentation liquid level curve is fitted; S4, using a borehole sampler (42) to drill a filling body sample, measure the compressive strength and tensile strength, analyze the plane strength distribution law of the filling body in the goaf area, and inversely analyze the segregation characteristics of the filling slurry along the slurry flow direction; S5. Establish a quantitative relationship model between slurry segregation and vertical drop height and horizontal flow distance under given filling materials, proportion parameters and rheological parameters. Invert the correlation model between the plane and vertical filling strength of the goaf and the corresponding slurry segregation, and reveal the strength distribution law of the filling in the three-dimensional space of the goaf.

6. The method for testing the pouring, flow morphology and mechanical strength evolution of filling slurry according to claim 5, characterized in that: In S1, the flow rate of the filling slurry needs to be determined according to the Froude similarity criterion.

7. The method for testing the pouring, flow morphology and mechanical strength evolution of filling slurry according to claim 5, characterized in that: The method for determining the vertical segregation law and vertical segregation degree in S2 is as follows: according to the high-speed camera data, the falling height H is divided into n sections, and the area q occupied by the interface marker particles in each section is measured. n With the interface area s n The ratio of the vertical segregation in the segment is defined as q n / s n , thus the overall vertical segregation of the slurry is 8. The method for testing the pouring, flow morphology and mechanical strength evolution of filling slurry according to claim 7, characterized in that: In S2, the least square method is used to fit the formula, with the filling parameters and the pouring height of the filling slurry as input variables and the vertical segregation as output, to obtain the quantitative relationship between the vertical segregation and the filling parameters and the pouring height of the filling slurry.

9. The method for testing the pouring, flow morphology and mechanical strength evolution of filling slurry according to claim 5, characterized in that: After the backfill in S3 is cured, it is divided into several areas along the slurry flow direction. In each area, a borehole television analyzer (41) is used to count the backfill stratification phenomenon and fit the slope equation of each layer. According to the segregation of the backfill in the mining field model, the backfill in each borehole is uniformly divided into several layers, and the height distribution range of each layer is recorded respectively. Then, the height distribution range of each layer in each borehole is reflected in a two-dimensional coordinate system, and the slope curve equation of each layer height versus slurry flow length is fitted and drawn.

10. The method for testing the pouring, flow morphology and mechanical strength evolution of filling slurry according to claim 9, characterized in that: In S4, samples were taken by drilling in each partition to measure their uniaxial compressive strength and tensile strength after curing. The flow distance from the slurry drop point was taken as the independent variable, and the distribution law of the compressive strength and tensile strength of the filling body with the flow distance of the filling slurry was fitted and established.

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