A filling body false roof construction method

Abstract

The present invention provides a method for constructing a filling body false roof, which relates to the technical field of filling mining. The method for constructing a filling body false roof provided by the present invention includes the following steps after the false roof stope is mined: a wire rope laying step: laying multiple wire ropes along the length of the false roof stope, each wire rope being fixed in the ore rock; a steel mesh laying step: laying steel mesh on the bottom plate of the false roof stope; an assembly step: connecting the wire ropes and the steel mesh to form a combined support structure; and a filling step: constructing a filling retaining wall and filling the false roof stope. The method for constructing a filling body false roof provided by the present invention simplifies the construction process of the filling body false roof, reduces the labor intensity and safety risks of workers, and can provide a more stable and reliable filling body false roof for lower approaches or segmented stopes, thereby improving the structural safety factor.

Description

Technical Field

[0001] The invention relates to the technical field of filling mining, in particular to a method for constructing a false roof of a filling body. Background Art

[0002] As underground metal and non-metallic mines continue to deepen, traditional mining methods may no longer be able to meet the increasingly stringent mining technical requirements. In recent years, in response to the external environment of deep ore bodies, characterized by high geostress, high water pressure, and intense mining disturbances, as well as the inherent characteristics of the ore body, China has developed downward-type backfill mining methods. These include downward-leveled approach backfill mining and downward-leveled open-pit backfill mining. In this backfill mining method, the immediate roof of the stope to be mined is an artificial false roof constructed by the backfill of the upper stope. Practice has shown that this artificial backfill can provide a safe, controllable, and stable roof for downward-type backfill mining operations.

[0003] Regarding the construction method of the filling body false roof, the current focus at home and abroad is on the research of the filling body false roof construction technology in the downward layered approach filling mining method. The usual practice is to weave a metal mesh on site at the approach stope after the ore is extracted from the approach stope, hang the metal mesh on the bottom hook of the upper stope, and then carry out the retaining wall closure, slurry filling and other processes to ensure that the metal mesh and the cured filling body form an integrated filling body false roof environment, forming a filling body false roof that meets the safety operation of the downward layered approach mining. According to the technical scheme of this type of filling mining method, there are generally the following filling body false roof construction methods:

[0004] The invention patent with application number CN202010229632.0 discloses a false roof for a filling body in a downward approach with a built-in prefabricated metal mesh reinforcement structure and its construction method. It proposes to set a prefabricated metal mesh in the false roof of the filling body in the downward approach, and the prefabricated metal mesh includes a prefabricated vertical mesh and a prefabricated bottom mesh. The prefabricated bottom mesh and the vertical mesh are set in the downward approach, and the two are connected to form a whole. The specific method is to temporarily fix the wall mesh in the prefabricated vertical mesh to the two side walls of the downward approach through anchor rods or hooks, and then connect the horizontal mesh with the vertical mesh, and then carry out retaining wall construction and slurry filling in the downward approach. This filling body false roof construction method has certain adaptability in the downward layered approach filling mining method, but on the one hand, its filling body false roof construction process is complicated, and on the other hand, because its connecting parts (anchor rods or hooks) are extremely easy to be damaged during actual operation, there are certain safety risks, which also exposes the limitations of this method in actual construction. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for constructing a filling body false roof, which simplifies the construction process of the filling body false roof, reduces the labor intensity and safety risks of workers, and can provide a more stable and reliable filling body false roof for the lower approach or segmented mining area, thereby improving the structural safety factor.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a method for constructing a filling body false roof, comprising the following steps after the false roof stope is mined:

[0008] Wire rope laying step: laying a plurality of wire ropes along the length direction of the false roof stope, wherein each of the wire ropes is fixed in the ore rock;

[0009] Steel mesh laying step: laying steel mesh on the bottom plate of the false roof stope;

[0010] Assembling step: connecting the steel wire rope and the steel mesh to form a combined support structure;

[0011] Filling step: constructing a filling retaining wall and filling the false roof stope.

[0012] Furthermore, after the mining of the false roof stope is completed, the method further comprises:

[0013] Determine the scope of the upper false roof stope based on the working area of ​​the stope to be mined;

[0014] Determine the stope layout and determine the stope dimensions.

[0015] Furthermore, the determination of the stope arrangement includes: the false roof stope is used as the stope at the top of the downward approach stope or as the stope at the top of the downward segmented stope;

[0016] For example, as the stope at the top of the downward approach stope, the false roof stope is composed of approach stops, and the top of each approach stope corresponds to a filling body false roof;

[0017] For example, as the stope at the top of the downward sub-level stope, the false roof stope is composed of an approach or a layered stope, creating a false roof of the first layer of filling for the downward sub-level stope.

[0018] Furthermore, in determining the stope size:

[0019] The false roof stope has a length of 4 to 100 m, a width of 3 to 20 m, and a height of 3 to 6 m.

[0020] Furthermore, in the steel wire rope laying step:

[0021] After the mining of the false roof stope is completed, the bottom plate is leveled;

[0022] When laying the steel wire rope, the length of the steel wire rope is greater than the length of the stope, and both ends of the steel wire rope are respectively fixed in the ore rock at both ends of the stope in the length direction;

[0023] The distance between two adjacent steel wire ropes is 0.5 to 5 meters.

[0024] Furthermore, in the steel mesh laying step:

[0025] The steel mesh is laid entirely within the bottom plate range of the false roof stope.

[0026] Furthermore, the steel mesh includes multiple overlapping sub-meshes, the sub-meshes include overlapping main bars and secondary bars, the diameter of the main bars is larger than the diameter of the secondary bars, the mesh size of the sub-meshes is 100 to 600 mm, and the overlap length between two adjacent sub-meshes is 1 to 3 mesh sizes.

[0027] Furthermore, the steel mesh laying step specifically includes:

[0028] Along the extending direction of each steel wire rope, the overlapping parts of the steel wire rope and the steel mesh are connected by connecting pieces to form a combined support structure.

[0029] Furthermore, in the filling step:

[0030] After filling the false roof stope, the uniaxial compressive strength of the stope filling body is not less than 1.0 MPa.

[0031] Furthermore, the steel wire rope is an anchor rope used for anchor rope support and / or a steel strand discarded during mine shaft maintenance.

[0032] When constructing a false roof for the filling body in the traditional approach, the bottom net is generally hung on the bottom hook of the upper mining area by means of hanging rods or the like, or the bottom net is first connected to the vertical net, and then the vertical net is fixed to the two side walls by means of anchor rods or hooks to ensure the integrity of the steel mesh structure. For the first method, due to the use of downward mining, the force exerted on the hanging rods of the lower mining area will be gradually transmitted to the hanging rods of the uppermost mining area, which is prone to problems such as overall collapse, and there is a critical safety risk. In addition, the construction process of the above method is complicated, and the bottom hooks are not easy to be exposed after the upper mining area is filled, and the smooth implementation of the hanging rods cannot be guaranteed. For the second method, the vertical net is fixed to the two side walls by means of anchor rods or hooks, which will destroy the arranged anchor rods or hooks during the two-step approach mining, and will cause damage to the internal structure of the filling body of the one-step approach, and the overall stability of the false roof of the filling body cannot be guaranteed. The method for constructing a false roof for a filling body provided by the present invention can produce the following beneficial effects relative to the prior art:

[0033] 1) The method for constructing a false roof of a filling body provided by the present invention is to lay steel wire ropes at the bottom of the mining area, fix the steel wire ropes in the ore rock at both ends of the mining area in the length direction, and connect the steel wire ropes with the steel mesh to form a steel wire rope-steel mesh combined support structure. After that, the mining area can be filled, which simplifies the construction process of the false roof of the filling body and reduces the labor intensity and safety risks of workers.

[0034] 2) In the filling body false roof construction method provided by the present invention, a wire rope-steel mesh combined support structure is formed, and the ore rock directly bears the pulling force of the combined support structure. When used as the roof of the downward approach mining area, it does not need to be suspended at the bottom of the upper mining area. Therefore, the combined support structure of each mining area basically only needs to bear the filling body in the mining area to ensure that it forms a stable false roof structure. The lower mining area will not cause a load on the upper mining area, thereby effectively avoiding the instability of the combined support structure in the top several layers of mining areas, and providing a more stable and reliable filling body false roof for the lower approach or segmented mining area.

[0035] 3) In the method for constructing a false roof for a filling body provided by this invention, since both ends of the steel wire ropes in each stope are directly fixed in the ore rock, each composite support structure effectively carries the load. This leverages the high tensile and shear resistance of the steel wire ropes, enhancing the reliability and safety factor of the composite support structure. Conventional steel mesh structures, on the other hand, bear the cumulative pressure transmitted from the upper stope, resulting in a passive load-bearing structure with increasingly poor reliability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic diagram showing the relative arrangement of the upper filling body false roof area stope and the lower segmented stope provided in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the relative arrangement of a mining stope and an adjacent mining and filling stope provided in an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of the planar layout of a steel wire rope-steel mesh combined support structure in a mining stope provided by an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of horizontal and vertical overlap of steel mesh in a mining site provided by an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the cross-sectional layout of a wire rope-steel mesh combined support structure in a mining stope provided by an embodiment of the present invention.

[0042] Icons: 1- false roof of filling body; 2- segmented stope; 3- stope in process of mining; 4- stope after adjacent mining and filling; 5- wire rope; 6- steel mesh; 61- sub-mesh; 7- connector. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0047] This embodiment provides a method for constructing a false roof of a filling body. Figure 1 and Figure 2 As shown, the following steps are performed after the false roof stope is mined: a wire rope laying step: laying multiple wire ropes 5 along the length direction of the false roof stope, and each wire rope 5 is fixed in the ore rock; a steel mesh laying step: laying a steel mesh 6 on the bottom plate of the false roof stope; an assembly step: connecting the wire rope 5 and the steel mesh 6 to form a combined support structure; a filling step: constructing a filling retaining wall to fill the false roof stope.

[0048] In the above-mentioned filling body false roof construction method, the wire rope laying step can be performed first, and then the steel mesh laying step, or the steel mesh laying step can be performed first, and then the wire rope laying step. That is, there is no particular order for laying the wire rope and laying the steel mesh, as long as the wire rope and the steel mesh can be connected to form a combined support structure.

[0049] The above-described method for constructing a false roof for the filling body is primarily designed for underground metal and non-metal mines containing soft and broken ore zones or sections, where a downward-type backfill mining method is used to construct a false roof for the upper filling body. This method pre-arranges a steel wire rope 5 and a steel mesh 6 at the bottom of the upper false roof stope. These wire ropes 5 and the steel mesh 6 are connected to form a combined support structure, transforming the conventional "suspended" structure (horizontal or vertical nets, etc., are suspended from hooks at the bottom of the upper stope via slings or other means) into a "side-pull" structure (with both ends of the steel wire rope 5 fixed in the ore rock)

[0050] On the one hand, by simplifying the filling body false roof construction process, construction efficiency is improved, the time personnel spend working in the open area is shortened, and construction costs and safety risks are reduced. On the other hand, when the false roof is used as the roof of the downward approach stope, it can effectively prevent the instability of the combined support structure located in the top several layers of the stope. At the same time, the use of a safe and reliable wire rope-steel mesh combination structure ensures the safety of the lower approach or sub-level stope recovery process, improving the overall production capacity, efficiency, and safety of such ore mining. Finally, the high tensile and shear resistance of the wire rope 5 is utilized to improve the safety factor of the combined support structure. On this basis, the stope filling work is carried out to form a safe and stable upper filling body false roof.

[0051] In some embodiments, since the top of the lower mining area to be mined needs to form a false roof of filling body with strength that meets the safety requirements of mining operations, the scope of the upper false roof mining area needs to be consistent with the operating area of ​​the mining area to be mined. After the mining of the false roof mining area is completed, it also includes determining the scope of the upper false roof mining area according to the operating area of ​​the mining area to be mined, thereby determining the extension length of the wire rope, the laying range of the steel mesh and the filling range, and then determining the mining area layout and the mining area size.

[0052] Based on the above embodiment, there are two ways to determine the stope layout:

[0053] One is a false roof stope as the stope at the top of the downward approach stope. In this case, the false roof stope is composed of the approach stopes, and the top of each approach stope corresponds to a filling body false roof.

[0054] like Figure 1 As shown, the other type is a stope that serves as the top of a downward sublevel stope. In this case, the false roof stope is composed of an approach or layered stope, creating a false roof for the first layer of filling for the downward sublevel stope.

[0055] Based on the above embodiment, the length, width, and height of the false roof stope can be determined according to actual needs when determining the stope size. The length of the false roof stope is generally between 4 and 100 meters, and can be 4 meters, 10 meters, 30 meters, 50 meters, 80 meters, 100 meters, etc.; the width is generally between 3 and 20 meters, and can be 3 meters, 8 meters, 10 meters, 12 meters, 15 meters, 20 meters, etc.; the height is generally between 3 and 6 meters, and can be 3 meters, 4 meters, 5 meters, 6 meters, etc.

[0056] In some embodiments, during the wire rope laying step, after the false roof stope is mined, the floor is leveled, and then the wire rope 5 is laid. The length of the wire rope 5 is greater than the stope length, and both ends of the wire rope 5 are fixedly connected to the ore rock at both ends of the stope, thereby directly transmitting the pulling force on the wire rope 5 to the ore rock at the end of the stope.

[0057] Specifically, the distance between two adjacent steel wire ropes 5 is 0.5-5m, specifically 0.5m, 1m, 2m, 3m, 4m, 5m, etc. The distance between two adjacent steel wire ropes 5 can also be adjusted according to the length, width and height of the stope.

[0058] In some embodiments, in order to enable the combined support structure and the cured filling body to form a stable filling body false roof environment, in the steel mesh laying step, the steel mesh 6 is laid entirely within the range of the false roof stope floor.

[0059] It should be noted that the above-mentioned “the entire bottom plate of the false roof mine is covered with steel mesh 6” does not limit the steel mesh 6 to being directly laid on the bottom plate of the false roof mine without the existence of a steel wire rope 5 between the two. Instead, it is intended to indicate that the entire bottom plate of the false roof mine is covered with steel mesh 6 without any missing points.

[0060] In some embodiments, to facilitate the installation of the steel mesh 6, as shown in FIG. Figure 3 As shown, the steel mesh 6 comprises a plurality of overlapping sub-mesh bodies 61. The mesh size of the sub-mesh body 61 is 100-600 mm, and can be specifically 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, etc.

[0061] Specifically, the overlap length between two adjacent sub-grid bodies 61 is 1 to 3 mesh sizes, specifically 1 mesh size, 2 mesh sizes or 3 mesh sizes, to ensure that the steel mesh 6 can be stably laid on the bottom plate of the false roof mining area, facilitating the connection of two adjacent sub-grid bodies 61.

[0062] The subnet body 61 includes main reinforcement and secondary reinforcement that overlap each other, and the diameter of the main reinforcement is larger than the diameter of the secondary reinforcement. The distribution of the main reinforcement and the secondary reinforcement can be as follows:

[0063] Method 1:

[0064] The main reinforcement extends perpendicular to the direction of extension of the secondary reinforcement. For example, during installation, the main reinforcement extends along the extension direction of the false roof stope (which can be roughly regarded as the length direction of the false roof stope), and the secondary reinforcement extends along the width direction of the false roof stope. Because the sub-grid body 61 is primarily subjected to the tensile force along the extension direction of the false roof stope, this arrangement can increase the load-bearing capacity of the steel mesh 6, thereby ensuring the stability of the false roof structure.

[0065] Method 2:

[0066] The main reinforcement includes a first main reinforcement extending along the extension direction of the false roof mine (which can be approximately regarded as the length direction of the false roof mine) and a second main reinforcement extending along the width direction of the false roof mine. The auxiliary reinforcement includes a first auxiliary reinforcement extending along the extension direction of the false roof mine (which can be approximately regarded as the length direction of the false roof mine) and a second auxiliary reinforcement extending along the width direction of the false roof mine. The first main reinforcement, the second main reinforcement, the first auxiliary reinforcement and the second auxiliary reinforcement are distributed crisscrossly to form a mesh structure. The specific distribution situation can be that several first auxiliary reinforcements are sandwiched between two adjacent first main reinforcements, and several second auxiliary reinforcements are sandwiched between two adjacent first auxiliary reinforcements.

[0067] Of course, the distribution of the main reinforcement and the secondary reinforcement is not limited to the above two types. Any situation in which a mesh structure can be formed by the criss-cross distribution of the main reinforcement and the secondary reinforcement is acceptable.

[0068] During the reinforcement mesh installation process, the steel wire rope 5 and the reinforcement mesh 6 can be connected in a variety of ways. For example, the overlapping portion of the steel wire rope 5 and the reinforcement mesh 6 can be connected via a connector 7. The connector 7 can be an annular connector with an opening, with the two ends of the annular connector threadedly connected via a rotating member to achieve opening and closing of the opening. The connector 7 can also be a steel wire, and the steel wire rope 5 and the reinforcement mesh 6 can be secured by steel wire tying, which is simple and convenient to operate. The steel wire rope 5 and the reinforcement mesh 6 can also be secured by interpenetrating, that is, the steel wire rope 5 passes through the mesh of the reinforcement mesh 6 to secure the reinforcement mesh 6.

[0069] Of course, the connection method between the steel wire rope 5 and the steel mesh 6 is not limited to the above three types, and any structure that can achieve the connection between the two can be used.

[0070] In some embodiments, in the filling step: after filling the false roof stope, the uniaxial compressive strength of the stope filling body is not less than 1.0 MPa to ensure the stability of the false roof structure.

[0071] In some embodiments, the steel wire rope 5 can be one of the anchor cables used for anchor cable support and the steel strands discarded during mine shaft maintenance. It has a certain ability to resist tension and shear forces. Of course, other materials can also be recycled. There is no need for additional processing of the steel wire rope 5. The false roof construction materials are easy to obtain and the overall material cost is low.

[0072] The following is a specific example to illustrate the method of constructing a false roof for a filling body:

[0073] A large underground metal mine produces approximately 1.5 million tons of ore annually, with high grade and value. The main ore body is approximately 1,500 meters long along strike and 1,700 meters long along dip. It is large and thick overall, ranging from 10 to 60 meters thick, with an average thickness of approximately 30 meters. The ore body is moderately inclined to dipping, with a dip angle of approximately 50° to 70°.

[0074] The mining area is characterized by well-developed fault structures, a thick ore-controlling structural alteration zone, and complex engineering geological conditions. While the rock is relatively hard, the structural planes are well-developed, directly impacting rock mass quality. The ore bodies are primarily hosted within granitic fractured veins, and the rock mass quality is generally average to very poor. The rock mass of shallower ore bodies is superior to that of deeper ore bodies, and future deep mining operations will significantly increase tectonic stress. The surrounding rock mass of the ore bodies, composed of granite and diorite, is unstable and even fragmented, with little self-stabilization capacity upon exposure.

[0075] Based on the thickness and rock quality of different ore bodies, the original mine design employed upward horizontal slicing, upward and downward approach-fill mining. The shallow ore bodies were mined with good rock quality, so upward mining was the primary method. However, the deeper ore bodies experienced poor rock quality and high in-situ rock stress, so the primary method was downward-moving, subleveled, open-pit, and subsequent fill mining.

[0076] By using the filling body false roof construction method provided by the above embodiment, the example mine adopts the present invention when mining deep high stress soft broken ore body. Figures 1 to 5 The method for constructing a false roof for underground filling in a mine shown in the figure specifically includes the following steps and requirements:

[0077] (1) Example: The mining is divided into two parts, the upper area is the filling body false roof, and the lower area is the descending sublevel stope. Figure 1 As shown, the upper filling body false roof 1 is divided into multiple approaches or layered stopes, namely C1, C2, C3, C4, ..., C(n-2), C(n-1), C(n), and the stope length is 4 to 100m, the width is 3 to 20m, and the height is 3 to 6m. In this example, the approach length is 50m, the width is 6m, and the height is 4m. The lower segmented stope 2 is divided into D1, D2, ..., D(t-1), D(t), and its layout direction is perpendicular to the layout direction of the stope in the upper filling body false roof 1. The length of the lower segmented stope 2 is related to the number of approach arrangements in the upper filling body false roof area, with a width of 10m and a height of 15m. As shown Figure 2 As shown, the middle stope is the stope 3 under mining, and the stopse 3 on both sides are adjacent stopes 4 after mining and filling.

[0078] (2) In this case, three anchor cables are arranged along the length of the mining area. The anchor cables adopt the anchor cable specifications commonly used in mine anchor cable support. The anchor cable diameter is φ15.24mm, the anchor cable spacing is 2m, and they are evenly distributed. The two ends of the anchor cable extend 2m beyond the boundary of the mining area and are embedded in the ore rock at both ends to form a stable structure with fixed supports at both ends.

[0079] (3) In this case, prefabricated steel mesh 6 is used for on-site splicing on the laid anchor cable. The length of a single steel mesh is 4.5m, the width is 1.5m, and the mesh size is 300mm×300mm. The on-site splicing work is divided into two parts. One part is the splicing between steel meshes. One mesh is spliced ​​along the extension direction of the mining area (which can be regarded as the length direction) and two meshes are spliced ​​along the width direction of the mining area. The splicing form is buckle or steel wire binding. The other part is the splicing between steel mesh and anchor cable. The splicing spacing is 2m×1.2m. The splicing form is buckle or steel wire binding. At this point, the anchor cable-steel mesh combined support structure is formed.

[0080] (4) In this case, after the anchor cable-steel mesh combined support structure is completed, the retaining wall closure and slurry filling work in the mining area are started. When the mining area is filled, the filling slurry with a ash-sand ratio of 1:4 to 1:5 is used for filling. After all the mining and filling in the mining area is completed, the filling body false roof required for safe mining in the lower section mining area is formed.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for constructing a filling body false roof, characterized in that: The following steps are carried out after the false roof stope is mined: Wire rope laying step: laying a plurality of wire ropes (5) along the length direction of the false roof stope, wherein each of the wire ropes (5) is fixed in the ore rock; Steel mesh laying step: laying steel mesh (6) on the bottom plate of the false roof stope; Assembling step: connecting the steel wire rope (5) and the steel mesh (6) to form a combined support structure; Filling step: constructing a filling retaining wall to fill the false roof stope; In the steel mesh laying step: the steel mesh (6) is laid entirely within the bottom plate range of the false roof stope; The steel mesh (6) comprises a plurality of mutually overlapping sub-mesh bodies (61), wherein the sub-mesh body (61) comprises mutually overlapping main bars and secondary bars, wherein the diameter of the main bars is greater than the diameter of the secondary bars; The main reinforcement extends along the extension direction of the false roof stope, and the secondary reinforcement extends along the width direction of the false roof stope; or the main reinforcement includes a first main reinforcement extending along the extension direction of the false roof stope and a second main reinforcement extending along the width direction of the false roof stope, and the secondary reinforcement includes a first secondary reinforcement extending along the length direction of the false roof stope and a second secondary reinforcement extending along the width direction of the false roof stope, and the first main reinforcement, the second main reinforcement, the first secondary reinforcement and the second secondary reinforcement are distributed in a crisscross manner to form a mesh structure.

2. The method for constructing a filling body false roof according to claim 1, characterized in that: After the mining of the false roof stope is completed, the method further includes: Determine the scope of the false roof stope described above based on the operating area of ​​the stope to be mined; Determine the stope layout and determine the stope dimensions.

3. The method for constructing a filling body false roof according to claim 2, characterized in that: The stope layout includes determining: the false roof stope as the stope at the top of the down-going approach stope or as the stope at the top of the down-going segmented stope; For example, as the stope at the top of the downward approach stope, the false roof stope is composed of the approach stopes, and the top of each approach stope corresponds to a filling body false roof; For example, as the stope at the top of the downward sub-level stope, the false roof stope is composed of an approach or a layered stope, creating a false roof of the first layer of filling for the downward sub-level stope.

4. The method for constructing a filling body false roof according to claim 3, characterized in that: In determining the stope size: The false roof stope has a length of 4 to 100 m, a width of 3 to 20 m, and a height of 3 to 6 m.

5. The method for constructing a filling body false roof according to claim 1, characterized in that: In the wire rope laying steps: After the false roof stope is mined, the bottom plate is leveled; When laying the steel wire rope (5), the length of the steel wire rope (5) is greater than the length of the stope, and both ends of the steel wire rope (5) are respectively fixed in the ore rock at both ends in the length direction of the stope; The distance between two adjacent steel wire ropes (5) is 0.5 to 5 m.

6. The method for constructing a filling body false roof according to claim 1, characterized in that: The mesh size of the subnet body (61) is 100 to 600 mm, and the overlap length between two adjacent subnet bodies (61) is 1 to 3 mesh sizes.

7. The method for constructing a filling body false roof according to claim 1, characterized in that: The steel mesh laying step specifically includes: Along the extension direction of each steel wire rope (5), the overlapping portion of the steel wire rope (5) and the steel mesh (6) is connected via a connecting piece (7) to form a combined support structure.

8. The method for constructing a filling body false roof according to claim 7, characterized in that: In the filling step: After filling the false roof stope, the uniaxial compressive strength of the stope filling body is not less than 1.0 MPa.

9. The method for constructing a filling body false roof according to any one of claims 1 to 8, characterized in that: The steel wire rope (5) is an anchor rope used for anchor rope support and / or a steel strand discarded during mine shaft maintenance.

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