False bottom pre-supporting device for downward drift filling method process and construction method of false bottom pre-supporting device

Abstract

The invention provides a false bottom pre-supporting device for a downward drift filling method process and a construction method of the false bottom pre-supporting device, and belongs to the technical field of mining. The false bottom pre-supporting device comprises a broken ore cushion layer, a plurality of inflatable air bags arranged in an array mode, a reinforcing mesh and a plurality of expansion conical anchor rods. The expansion conical anchor rod comprises a conical rod body, a plurality of protruding parts arranged on the peripheral wall of the conical rod body, a turnbuckle arranged in the conical rod body, a hanging bar and a sliding block, wherein the hanging bar and the sliding block are connected with an upper end pull ring and a lower end pull ring of the turnbuckle respectively. And the bottom end of the conical rod body is welded with the staggered points of the main reinforcements and the auxiliary reinforcements of the reinforcing mesh. And the conical rod body is of a hollow cylindrical structure with a narrow upper part and a wide lower part. When the whole false bottom moves downwards, the hanging bar pulls the sliding block to move upwards in the conical rod body, the resistance borne by the sliding block is larger and larger, the conical rod body is extruded by the sliding block, the pipe wall of the conical rod body is gradually widened, and the anchoring force of the expansion conical anchor rod and the hanging force on the whole false bottom are enhanced.

Description

Technical Field

[0001] The present application relates to the field of mining technology, and in particular to a false bottom pre-support device for a downward approach filling process and a construction method thereof. Background Art

[0002] As the development of metal mineral resources extends to the depths, deep mining projects face multiple challenges such as high ground stress and complex geological structures. The construction of a safety control system has become a key technical bottleneck restricting the sustainable development of mines. The downward approach filling mining method has shown significant advantages in maintaining the stability of the surrounding rock of the mining area due to its "disturbance control-filling support" synergistic mechanism, and has now become the mainstream process for deep ore mining. In this process system, the false bottom structure serves as the core bearing unit for supporting the filling load and ensuring layered continuous mining. Its structural integrity directly determines the risk level of instability in the mining area and the efficiency of the mining cycle.

[0003] Current engineering practices mostly use passive support systems based on the suspension principle, that is, using a single-layer steel mesh or anchor truss as the main load-bearing skeleton, and anchoring the ends to the sides of the mine or the upper and lower plates of the ore body to achieve structural suspension. This type of traditional false bottom has risks such as insufficient structural mechanical properties, weak interface coupling effect, and boundary constraint failure.

[0004] In response to the above-mentioned problems, it is urgent to build a new lifting system architecture with stress adaptive characteristics, improve the traditional false bottom laying structure, increase the filling connection rate, and establish a false bottom real-time monitoring system including multi-parameter sensing to realize dynamic perception and instability warning of the deformation field and stress field of the false bottom structure, so as to ensure the safety and production efficiency of the downward filling mining site. Summary of the invention

[0005] In view of the technical problems existing in the background technology, the present application provides a false bottom pre-support device for a downward approach filling method process and a construction method thereof. The false bottom pre-support device for the downward approach filling method process is configured by setting a conical rod body as a hollow cylindrical structure with a narrow top and a wide bottom, and arranging a plurality of protruding parts on its outer peripheral wall; a turnbuckle screw with an integrated tension sensor is arranged inside the turnbuckle screw, the upper end pull ring of the turnbuckle screw is connected to the hanging bar, and the lower end pull ring of the turnbuckle screw is connected to a slider. The bottom end of the conical rod body is welded to the intersection of the main bar and the secondary bar; the upper end of the hanging bar is connected to the bottom of the top plate support body or the upper false bottom; when the false bottom is displaced downward as a whole, the hanging bar pulls the slider to move upward in the conical rod body. Based on the structural setting of the conical rod body with a narrow top and a wide bottom, the slider is subjected to increasing resistance, and the conical rod body is squeezed by the slider, resulting in the gradual widening of its tube wall, thereby enhancing the anchoring force of the expansion conical anchor rod and the suspension force on the overall false bottom.

[0006] In the first aspect, the embodiment of the present application provides a false bottom pre-support device for a downward approach filling method process, comprising a crushed ore cushion layer arranged on the bottom plate of the approach mining field, a plurality of inflatable air bags arranged in an array on the crushed ore cushion layer, a steel mesh and a plurality of expansion conical anchor rods; the expansion conical anchor rod comprises a conical rod body, a plurality of protrusions arranged on the outer peripheral wall of the conical rod body, a basket screw arranged in the conical rod body, and a hanging rod and a sliding block respectively connected to the upper end pull ring and the lower end pull ring of the basket screw; the steel mesh comprises a plurality of main bars and Auxiliary reinforcement, the steel mesh is provided with a makeshift space for the inflatable airbag to pass through; the bottom end of the conical rod body is welded to the intersection of the main reinforcement and the auxiliary reinforcement; the upper end of the hanger is connected to the bottom of the top plate support body or the upper false bottom; the conical rod body is a hollow cylindrical structure that is narrow at the top and wide at the bottom. When the false bottom is displaced downward as a whole, the hanger pulls the slider to move upward in the conical rod body, and the resistance encountered by the slider becomes greater and greater, and the conical rod body is squeezed by the slider, causing its tube wall to gradually widen, so as to enhance the anchoring force of the expansion conical anchor rod and the suspension force on the overall false bottom.

[0007] In some embodiments, the expansion conical anchor rod also includes a ring connecting the conical rod body and the steel mesh and a first pull ring connected to the bottom of the ring; the inner wall of the ring is welded to the intersection of the main reinforcement and the secondary reinforcement; and a pressure sensor is arranged inside the ring.

[0008] In some embodiments, the mesh size of the expansion cone anchor rods is 1000mm x 1500mm, that is, the spacing between adjacent expansion cone anchor rods along the length direction of the route is 1m, and the spacing between adjacent expansion cone anchor rods along the width direction of the route is 1.5m.

[0009] In some embodiments, a plurality of the protrusions are evenly distributed on the outer peripheral wall of the conical rod body.

[0010] In some embodiments, the protruding portion is provided with an inclined surface which is inclined from the outer peripheral wall of the conical rod body to the lower right.

[0011] In some embodiments, the inflatable airbag is a cubic inflatable airbag with a size of 1.5m x 1.5m x 1.5m; the distance between adjacent inflatable airbags is 35m.

[0012] In some embodiments, a wire sensor is provided below the main rib or the secondary rib.

[0013] In some embodiments, a tension sensor is provided on the turnbuckle.

[0014] In some embodiments, the accuracy of the pressure sensor is 1 KN; the accuracy of the wire sensor is 1 mm; and the accuracy of the tension sensor is 0.1 KN.

[0015] In a second aspect, an embodiment of the present application provides a construction method for a false bottom pre-support device for a downward approach filling method process, comprising the following steps:

[0016] S1, when the mining is completed, a crushed ore cushion layer is laid on the bottom plate, the thickness of the crushed ore cushion layer is not less than 20cm, and a geotextile is laid on the crushed ore cushion layer;

[0017] S2, placing a cubic inflatable airbag at a distance of 9.5-10.5m from the tunnel face, and one is arranged every 35m along the direction of the mining area, and the size of the cubic inflatable airbag is 1.5mx 1.5mx 1.5m;

[0018] S3, placing wooden pads on the geotextile, constructing the main reinforcement and secondary reinforcement on the wooden pads, and welding the wire sensor under the main reinforcement or secondary reinforcement;

[0019] S4, at the intersection of the main reinforcement and the secondary reinforcement, an expansion cone anchor rod is constructed every 1000mmx1500mm mesh, the expansion cone anchor rod comprising a cone rod body, a plurality of protrusions arranged on the outer peripheral wall of the cone rod body, a turnbuckle arranged in the cone rod body, and a hanger rod and a slider respectively connected to the upper end pull ring and the lower end pull ring of the turnbuckle; the cone rod body is a hollow cylindrical structure narrow at the top and wide at the bottom; the lower end of the expansion cone anchor rod is welded to the main reinforcement and the secondary reinforcement through a sleeve ring, and the top end thereof is connected to the support body of the top plate or the bottom of the upper false bottom through a hanger rod; then the turnbuckle in the cone rod body is adjusted so that the tension sensor on the turnbuckle detects a preload of 1KN;

[0020] S5, carry out filling work of false bottom and mining area.

[0021] The beneficial effects of the present invention are:

[0022] The false bottom pre-support device for the downward approach filling method provided by the present invention, firstly, uses an expansion conical anchor rod with a protruding portion ("barb") to construct a three-dimensional anchoring system, and the synergistic effect of the conical rod body and the "barb" structure significantly enhances the overall mechanical properties of the false bottom structure. The radial constraint force generated by the "barb" embedded in the filling body and the pre-tightening force of the turnbuckle screw form a composite anchoring effect, which increases the structural bearing capacity by more than 30%, and effectively solves the problem of weak coupling at the interface of the traditional false bottom. Secondly, the present invention not only realizes the precise connection of the lower filling pipeline to the top through the filling nest formation mechanism through the pre-buried inflatable airbag system, but also reduces the material cost through the recyclable design of the airbag.

[0023] Third, the present invention constructs a multi-dimensional monitoring system. The integrated tension sensor (inside the basket screw) and the wire sensor provide real-time feedback on the stress state of the anchor rod and the deformation of the false bottom, visualizing the safety status of the structure. The monitoring accuracy reaches 0.1mm, and the risk of instability can be warned 12-24 hours in advance.

[0024] In addition, the present invention has designed the distribution spacing of the expansion cone anchor rods and the arrangement spacing of the inflatable airbags, realizing the modular design of the anchor rod assembly, which improves the construction efficiency by 40%. Moreover, the layered suspension bar connection system in this application (the lower expansion cone anchor rod is connected to the upper expansion cone anchor rod through the suspension bar) forms a continuous force transmission path, breaking through the technical bottleneck of the failure of the traditional false bottom layered constraint. While ensuring the stability of the filling body, the overall technical solution realizes the system integration innovation of the support-monitoring-filling process, providing a reliable guarantee for the safe and efficient mining of deep ore bodies.

[0025] 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

[0026] 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.

[0027] Figure 1 It is a schematic diagram of the structure of the expansion cone anchor in this application;

[0028] Figure 2 A top view of the arrangement of the false bottom steel mesh in the embodiment of the present application;

[0029] Figure 3 It is a structural schematic diagram of a false bottom pre-support device used in a downward approach filling method process in an embodiment of the present application;

[0030] Figure 4 It is a construction schematic diagram of the false bottom pre-support device used in the downward approach filling method process in the embodiment of the present application. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] 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).

[0037] 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.

[0038] 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.

[0039] In the prior art, the downward approach filling mining process has problems such as insufficient structural mechanical properties, weak interface coupling effect and boundary constraint failure.

[0040] See also Figures 1 to 3 As shown, in order to solve the above problems, the present application provides a false bottom pre-support device for the downward approach filling method process, including a crushed ore cushion layer 12 arranged on the bottom plate of the approach mining field, a plurality of inflatable air bags 17 arranged in an array on the crushed ore cushion layer, a steel mesh arranged above the crushed ore cushion layer 12, and a plurality of expansion conical anchor rods 20. Among them, the expansion conical anchor rod 20 includes a conical rod body 2, a plurality of protrusions 4 ("barbs") arranged on the outer peripheral wall of the conical rod body 2, a basket screw 3 arranged in the conical rod body 2, and a hanging rod 1 and a slider 5 respectively connected to the upper end pull ring and the lower end pull ring of the basket screw 3. In this embodiment, the slider 5 is a uniform cylinder. A tension sensor is arranged in the basket screw 3, and the accuracy of the tension sensor is 0.1KN, which is used to detect the pre-tightening force of the basket screw. In this embodiment, when installing the expansion conical anchor rod 20, the turnbuckle 3 in the conical rod body 2 is adjusted so that the tension sensor on the turnbuckle 3 detects a preload of 1KN, so that the false bottom pre-support device is in a stressed state. By providing the turnbuckle 3 with a preload during initial installation, the overall bearing capacity of the device and the instability risk warning sensitivity are improved.

[0041] The steel mesh includes a plurality of main bars 6 and secondary bars 7 that are arranged perpendicular to each other, and a clearance space 18 is left on the steel mesh for the inflatable airbag 17 to pass through. The bottom end of the conical rod body 2 is welded to the intersection of the main bars 6 and the secondary bars 7; the upper end of the hanging bar 1 is connected to the bottom of the top plate support body or the upper false bottom. The conical rod body 2 is a hollow cylindrical structure that is narrow at the top and wide at the bottom. With this arrangement, when the false bottom is displaced downward as a whole, the hanging bar 1 pulls the slider 5 to move upward in the conical rod body 2. Since the conical rod body 2 is designed to be narrow at the top and wide at the bottom, the slider 5 is subject to increasing resistance, and the conical rod body 2 will be squeezed by the slider 5, causing its tube wall to gradually widen, further enhancing the anchoring force of the anchor rod and the suspension force on the overall false bottom.

[0042] Furthermore, the expansion cone anchor also includes a collar 8 connecting the cone rod body 2 and the steel mesh. The inner wall of the collar 8 is welded to the intersection of the main reinforcement 6 and the secondary reinforcement 7. The cone rod body 2 is welded to the collar 8 and connected to the main reinforcement 6 and the secondary reinforcement 7. A stress sensor is arranged in the collar 8 to measure the stress change in the vertical direction. When the false bottom is displaced downward as a whole, the displacement is monitored to realize the visualization of the structural safety status.

[0043] A first pull ring 9 is connected to the bottom of the ring 8, and the suspension rods of the next layer of false bottom can be connected here to form a continuous force transmission path through the layered suspension rod connection system, solving the technical problem of failure of traditional false bottom layered constraints.

[0044] In this embodiment, the mesh size of the expansion conical anchor rods 20 is 1000 mm x 1500 mm, that is, the spacing between adjacent expansion conical anchor rods 20 along the length direction of the route is 1 m, and the spacing between adjacent expansion conical anchor rods 20 along the width direction of the route is 1.5 m.

[0045] A plurality of protrusions 4 are evenly distributed on the outer peripheral wall of the conical rod body 2. The protrusions 4 are provided with an inclined surface which is inclined from the outer peripheral wall of the conical rod body 2 to the right and downward direction.

[0046] The inflatable airbag is a cubic inflatable airbag with a size of 1.5m x 1.5m x 1.5m; the distance between adjacent inflatable airbags is 35m.

[0047] The false bottom pre-support device for the downward approach filling method is also provided with a wire sensor 10. According to the strain area to be measured, the wire sensor 10 is welded below the main reinforcement 6 or the auxiliary reinforcement 7 to monitor the strain of the false bottom.

[0048] The accuracy of the stress sensor is 1KN; the accuracy of the wire sensor is 1mm.

[0049] The false bottom pre-support device used in the downward approach filling method can monitor the stress and strain of the false bottom structure through the stress sensor in the collar 8 and the wire sensor 10. Specifically, the two sensors can be connected to the industrial ring network underground in the mine through a data cable to realize real-time data transmission; if there is no need for real-time data transmission, the data line interface connecting the two sensors can be placed near the cubic inflatable airbag 17, and when the lower approach is mined to reveal the filling cavity 16 formed by the upper false bottom, the data line interface can be exposed, and then data collection and analysis can be carried out. By collecting the stress and strain data of the false bottom, the false bottom morphology and collapse risk monitoring can be realized.

[0050] The thickness of the crushed ore cushion layer 12 is greater than or equal to 20 cm.

[0051] See also Figure 4As shown, the present application also provides a construction method of a false bottom pre-support device for a downward approach filling method process, comprising the following steps:

[0052] S1, when the mining is completed, a crushed ore cushion layer 12 is laid on the bottom plate, the thickness of the crushed ore cushion layer 12 is not less than 20 cm, and a geotextile is laid on the crushed ore cushion layer 12;

[0053] S2, a cubic inflatable airbag 17 is placed at a distance of 9.5-10.5m from the tunnel face, and one is arranged every 35m along the direction of the mining area. The size of the cubic inflatable airbag is 1.5mx 1.5mx 1.5m;

[0054] S3, placing a number of wooden pads 11 at equal intervals on the geotextile, constructing the main reinforcement 6 and the secondary reinforcement 7 on the wooden pads, and welding the wire sensor 10 under the main reinforcement 6 or the secondary reinforcement 7;

[0055] S4, at the intersection of the main reinforcement 6 and the secondary reinforcement 7, an expansion cone anchor rod 20 is constructed every 1000mmx1500mm mesh. The lower end of the expansion cone anchor rod 20 is welded to the main and secondary reinforcements through a collar 8, and its top end is connected to the support body of the top plate (when this layer is the first mining layer) or the first pull ring 9 at the bottom of the upper false bottom (when this layer is not the first mining layer) through a hanger rod 1; after the connection is completed, adjust the basket screw 3 in the conical rod body 2 so that the tension sensor on the basket screw 3 detects a preload of 1KN;

[0056] S5, carry out filling work of false bottom and mining area.

[0057] During the construction of the lower mining area, due to the presence of the previously placed cubic inflatable airbag 17, a filling cavity 16 is formed on the roof. The end of the filling pipeline 15 is suspended in the filling cavity 16, which can effectively solve the filling and top connection problem of this layer and significantly improve the filling and top connection rate.

[0058] By providing the turnbuckle screw 3 with a pre-tightening force during initial installation, the overall bearing capacity of the device and the sensitivity of the instability risk warning are improved.

[0059] 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 false bottom pre-support device for a downward approach filling method, characterized in that: The invention comprises a crushed ore cushion layer arranged on the bottom plate of the access mining area, a plurality of inflatable air bags arranged in an array on the crushed ore cushion layer, a steel mesh and a plurality of expansion conical anchor rods; the expansion conical anchor rod comprises a conical rod body, a plurality of protrusions arranged on the outer peripheral wall of the conical rod body, a turnbuckle screw arranged in the conical rod body, and a hanging rod and a sliding block respectively connected to the upper end pull ring and the lower end pull ring of the turnbuckle screw; the steel mesh comprises a plurality of main bars and secondary bars arranged perpendicularly to each other, and a steel mesh is provided with a plurality of inflatable air bags arranged on the inflatable air bags. The airbag passes through the makeshift space; the bottom end of the conical rod body is welded to the intersection of the main reinforcement and the secondary reinforcement; the upper end of the hanger bar is connected to the bottom of the top plate support body or the upper false bottom; the conical rod body is a hollow cylindrical structure that is narrow at the top and wide at the bottom. When the false bottom is displaced downward as a whole, the hanger bar pulls the slider to move upward in the conical rod body, and the resistance encountered by the slider becomes greater and greater. The conical rod body is squeezed by the slider, causing its tube wall to gradually widen, so as to enhance the anchoring force of the expansion conical anchor rod and the suspension force on the overall false bottom.

2. The false bottom pre-support device for the downward approach filling method according to claim 1 is characterized in that: The expansion conical anchor rod also includes a collar connecting the conical rod body and the steel mesh and a first pull ring connected to the bottom of the collar; the inner wall of the collar is welded to the intersection of the main reinforcement and the secondary reinforcement; and a pressure sensor is arranged inside the collar.

3. The false bottom pre-support device for the downward approach filling method according to claim 1 is characterized in that: The spacing between adjacent expansion cone anchor rods along the length direction of the route is 1 m, and the spacing between adjacent expansion cone anchor rods along the width direction of the route is 1.5 m.

4. The false bottom pre-support device for the downward approach filling method according to claim 1 is characterized in that: A plurality of the protruding portions are evenly distributed on the outer peripheral wall of the conical rod body.

5. The false bottom pre-support device for the downward approach filling method according to claim 1 is characterized in that: The protruding portion is provided with an inclined surface which is inclined from the outer peripheral wall of the tapered rod body to the lower right side.

6. The false bottom pre-support device for the downward approach filling method according to claim 1 is characterized in that: The inflatable airbag is a cubic inflatable airbag with a size of 1.5m x 1.5m x 1.5m; the distance between adjacent inflatable airbags is 35m.

7. The false bottom pre-support device for the downward approach filling method according to claim 2 is characterized in that: A wire sensor is arranged below the main reinforcement or the secondary reinforcement.

8. The false bottom pre-support device for the downward approach filling method according to claim 7 is characterized in that: A tension sensor is arranged on the turnbuckle screw.

9. The false bottom pre-support device for the downward approach filling method according to claim 8 is characterized in that: The accuracy of the pressure sensor is 1KN; the accuracy of the wire sensor is 1mm; and the accuracy of the tension sensor is 0.1KN.

10. A construction method for a false bottom pre-support device for a downward approach filling process, characterized in that: The following steps are involved: S1, when the mining is completed, a crushed ore cushion layer is laid on the bottom plate, the thickness of the crushed ore cushion layer is not less than 20cm, and a geotextile is laid on the crushed ore cushion layer; S2, placing a cubic inflatable airbag at a distance of 9.5-10.5m from the tunnel face, and one is arranged every 35m along the direction of the mining area, and the size of the cubic inflatable airbag is 1.5mx 1.5mx 1.5m; S3, placing wooden pads on the geotextile, constructing the main reinforcement and secondary reinforcement on the wooden pads, and welding the wire sensor under the main reinforcement or secondary reinforcement; S4, at the intersection of the main reinforcement and the secondary reinforcement, an expansion cone anchor rod is constructed every 1000mmx1500mm mesh, the expansion cone anchor rod comprising a cone rod body, a plurality of protrusions arranged on the outer peripheral wall of the cone rod body, a turnbuckle arranged in the cone rod body, and a hanger rod and a slider respectively connected to the upper end pull ring and the lower end pull ring of the turnbuckle; the cone rod body is a hollow cylindrical structure narrow at the top and wide at the bottom; the lower end of the expansion cone anchor rod is welded to the main reinforcement and the secondary reinforcement through a sleeve ring, and the top end thereof is connected to the support body of the top plate or the bottom of the upper false bottom through a hanger rod; then the turnbuckle in the cone rod body is adjusted so that the tension sensor on the turnbuckle detects a preload of 1KN; S5, carry out filling work of false bottom and mining area.

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