Treatment method for collapse area of water-rich high-sulfur broken ore deposit

Abstract

The invention relates to a treatment method for a water-rich high-sulfur crushed ore deposit collapse area. The treatment method for the collapse area of the water-rich high-sulfur broken ore deposit comprises the steps that the collapse area is treated by judging whether the collapse area is continuously collapsed or not, for the continuous collapse area, the optimal ore ash-sand ratio is obtained according to the coagulability and strength experiments of a high-sulfur ore body and cement, grouting reinforcement is conducted on loose ore, and the loose ore forms a whole; and for a discontinuous collapse area, cleaning and scanning are conducted, filling drill holes are designed, the prefabricated triangular reinforcement cage is unattended to the interior of the collapse area, the collapse area is filled according to the optimal ash-sand ratio, and it is guaranteed that the strength of a filling body of a lower-layer stoping revealing top plate meets the safety mining requirement. And safe, efficient and rapid treatment of the water-rich high-sulfur crushed ore deposit collapse area is realized.

Description

Technical Field

[0001] The present application relates to the technical field of ore bed collapse control, and in particular to a control method for a collapsed area of ​​a water-rich, high-sulfur, broken ore bed. Background Art

[0002] The water-rich, high-sulfur, broken ore body is prone to roof collapse during the mining process due to its high water content, soft and easy-to-break surrounding rock, and low recovery rate. The roof of the water-rich, high-sulfur, broken ore body often collapses during the first mining process, forcing the continuous mining operation to stop.

[0003] At present, the commonly used treatment method is that after the roof collapses, the ore is in a loose accumulation state. According to the on-site collapse situation, some of the collapsed materials are shoveled out or none of the collapsed materials are shoveled out, and a concrete filling retaining wall is poured at the mouth of the collapsed area for direct filling. However, this treatment method does not completely manage the collapsed area, which will cause the head to still be in a collapsed state when the lower layer or adjacent approach is mined to expose the collapsed area, and the collapsed area will still be exposed when the ore body in the collapsed area is mined; and when filling the collapsed area, in order to ensure the safety of the operation, the collapsed area does not have the conditions for personnel to enter the operation, and false bottom steel bars cannot be laid before filling, resulting in the roof filling body failing to meet the safe mining requirements after the lower layer is exposed. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related technology, the present application provides a method for the management of the collapsed area of ​​the water-rich and high-sulfur broken ore deposit, aiming to solve the problem that the collapsed area cannot be filled with false bottom steel bars, and the top plate filling body cannot meet the safety mining requirements after the lower layer is exposed.

[0005] The present application provides a method for treating a collapsed area of ​​a water-rich, high-sulfur, broken ore deposit, comprising:

[0006] (1) Determine whether the collapse area is continuous;

[0007] (2.1) If the collapse zone is judged to be a continuous collapse

[0008] Conduct coagulation and strength tests on high-sulfur ore bodies and cement to obtain the optimal lime-sand ratio, and perform grouting to reinforce the loose ore according to the optimal lime-sand ratio, so that the loose ore forms a whole;

[0009] (2.2) If the collapse zone does not collapse continuously

[0010] Shovel out the collapsed ore and use a 3D laser scanner to measure the shape and size of the collapsed area;

[0011] Design and construct a filling borehole based on the measured shape and size, wherein the filling borehole includes a filling slurry inlet hole, an exhaust hole and an overflow hole;

[0012] The prefabricated triangular steel cage is unmannedly transported to the interior of the collapsed area to lay false bottom steel bars, wherein the prefabricated triangular steel cage includes a triangular support, a steel frame and a false bottom anchor net;

[0013] Concrete retaining wall is poured at the mouth of the collapsed area to seal the collapsed area;

[0014] Filling tests on water-rich and high-sulfur crushed ore deposits were carried out to obtain the optimal ash-sand ratio, so as to fill the collapsed area with the optimal ash-sand ratio.

[0015] Optionally, in some embodiments, the design and construction of the filling borehole includes:

[0016] According to the measured collapse area conditions, a filling borehole was designed between the normal mining access and the top of the collapse area. A total of 3 boreholes were constructed, namely the filling slurry hole, the exhaust hole, and the overflow hole.

[0017] The drilling arrangement is that the exhaust hole is at the highest position, the slurry inlet hole is lower than the exhaust hole, and the overflow hole is lower than the slurry inlet hole. The spacing between the filling slurry inlet hole, the exhaust hole and the overflow hole is 0.5-1m, and the hole diameter is 130mm;

[0018] Casings are installed in the slurry filling hole, the exhaust hole and the slurry overflow hole.

[0019] Optionally, in some embodiments, the filling test of the water-rich and high-sulfur crushed ore deposit comprises:

[0020] According to the water gushing situation in the collapsed area of ​​the broken ore deposit, a lime-sand ratio experiment for grouting is carried out to obtain the optimal lime-sand ratio suitable for the current collapsed area, ensuring that the uniaxial compressive strength of the filling body in the collapsed area after grouting is greater than 4.5MPa.

[0021] Optionally, in some embodiments, the pouring of a concrete retaining wall at the mouth of the collapsed area includes:

[0022] After the false bottom reinforcement is laid, a 400mm-600mm thick concrete retaining wall is cast on the normal mining access road at the mouth of the collapsed area to seal the collapsed area.

[0023] Optionally, in some embodiments, the step of conducting a coagulation and strength test of a high-sulfur ore body and cement to obtain an optimal ore lime-sand ratio comprises:

[0024] The high-sulfur broken ore bodies in the collapsed area were sampled and the loose bodies were mixed with No. 425 cement at different lime-sand ratios to make standard test blocks;

[0025] The uniaxial compressive strength of the test blocks was measured at 3, 7, 14 and 28 days to verify whether the cohesion and strength of the high-sulfur ore body and cement met the mining requirements;

[0026] Based on the test results, drill holes are designed and constructed in the collapsed loose ore, and grouting reinforcement is carried out through drilling to form the loose ore into a whole, thereby improving the stability of the loose ore and exposing the top plate at the bottom to meet the needs of mining operations.

[0027] The present application also provides a prefabricated triangular steel cage, which is applied to a method for treating a collapsed area of ​​a water-rich, high-sulfur, broken ore deposit, comprising:

[0028] Triangular bracket, steel frame and false bottom anchor net;

[0029] The triangular bracket is made of three threaded steel bars welded into a triangular bracket. Each set of prefabricated triangular steel cage contains 5 or more triangular brackets.

[0030] The steel frame uses three threaded steel bars as the frame, and the steel frame is installed on the vertices of the triangular brackets to connect the triangular brackets in series;

[0031] The false bottom anchor net is composed of two 2m×1m steel meshes with a mesh size of 180mm×180mm. The false bottom anchor net is installed on the steel frame at the bottom of the triangular bracket.

[0032] Optionally, in some embodiments, the triangular bracket is made of three φ12mm threaded steel bars with a length of 1.0m, which are cross-connected to form a triangular bracket; a set of triangular steel cages includes 5 triangular brackets with a spacing between 810-900mm;

[0033] The steel skeleton is connected to the vertices of the triangular bracket by three φ12mm threaded steel bars, with a length of 3.5m, connecting multiple triangular brackets in series;

[0034] The false bottom anchor is composed of two 2m×1mφ6mm anchor nets with a mesh size of 180mm×180mm. Both sides of the steel mesh are fixedly connected to the bottom steel frame and the bottom reinforcement of the triangular bracket.

[0035] The technical solution provided by this application may have the following beneficial effects:

[0036] By judging whether the collapsed area is collapsing continuously, the collapsed area is managed separately. For the continuous collapsed area, the optimal ore lime-sand ratio is obtained according to the coagulation and strength experiments of the high-sulfur ore body and cement, and grouting is carried out to reinforce the loose ore to make the loose ore form a whole. For the non-continuous collapsed area, cleaning and scanning are carried out, filling drilling holes are designed, and prefabricated triangular steel cages are transported unmanned to the collapsed area, and the collapsed area is filled according to the optimal lime-sand ratio to ensure that the strength of the roof filling body exposed by the lower layer mining meets the requirements of safe mining, so as to achieve safe, efficient and rapid management of the collapsed area of ​​the water-rich high-sulfur broken ore deposit.

[0037] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0039] Figure 1 It is a schematic flow chart of a treatment method for a collapsed area of ​​a water-rich, high-sulfur, broken ore deposit shown in an embodiment of the present application;

[0040] Figure 2 It is a schematic diagram of the structure of the collapsed area shown in the embodiment of the present application;

[0041] Figure 3 It is a schematic diagram of the structure of a prefabricated triangular steel cage shown in an embodiment of the present application.

[0042] Figure numbers: 1-normal mining access, 2-concrete retaining wall, 3-collapse area, 4-overflow hole, 5-filling hole, 6-exhaust hole, 7-triangular support, 8-steel skeleton, 9-false bottom anchor net. DETAILED DESCRIPTION

[0043] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0044] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0045] In the description of the present application, 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.

[0046] Unless otherwise clearly specified and limited, the terms "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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The water-rich, high-sulfur, broken ore body is prone to collapse during the mining process due to its high water content, soft and easy-to-break surrounding rock, and low recovery rate. The roof of the water-rich, high-sulfur, broken ore body often collapses during the first mining process, forcing the continuous mining operation to stop. The commonly used treatment method is that after the head roof collapses, the ore is in a loose accumulation state. According to the on-site collapse situation, some of the collapsed materials are shoveled out or none of the collapsed materials are shoveled out, and a concrete filling retaining wall is poured at the mouth of the collapsed area for direct filling. However, this treatment method does not thoroughly manage the collapsed area, which will cause the head to still be in a collapsed state when the lower layer or adjacent approach is mined to expose the collapsed area, and the collapsed area will still be exposed when the ore body in the collapsed area is mined; and when filling the collapsed area, in order to ensure the safety of the operation, the collapsed area does not have the conditions for personnel to enter the operation, and the false bottom steel bars cannot be laid before filling, resulting in the roof filling body failing to meet the safe mining requirements after the lower layer is exposed.

[0048] In response to the above problems, an embodiment of the present application provides a method for managing the collapsed area of ​​a water-rich, high-sulfur, broken ore deposit. The method can determine whether the collapsed area is collapsing continuously and perform management of the collapsed area separately. For the continuous collapsed area, the optimal ore lime-sand ratio is obtained based on the coagulation and strength experiments of the high-sulfur ore body and cement, and grouting is performed to reinforce the loose ore to form a whole. For the non-continuous collapsed area, cleaning and scanning are carried out, filling drilling holes are designed, and prefabricated triangular steel cages are transported unmanned to the collapsed area, and the collapsed area is filled according to the optimal lime-sand ratio to ensure that the strength of the roof filling body exposed by the lower layer mining meets the requirements of safe mining, thereby achieving safe, efficient and rapid management of the collapsed area of ​​a water-rich, high-sulfur, broken ore deposit.

[0049] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0050] Embodiment 1

[0051] Figure 1 It is a flow chart of a method for treating a collapsed area of ​​a water-rich, high-sulfur, broken ore deposit as shown in an embodiment of the present application.

[0052] See also Figure 1 , a method for treating the collapsed area of ​​a water-rich, high-sulfur, broken ore deposit, comprising:

[0053] (1) Determine whether the collapse area is continuous;

[0054] (2.1) If it is judged that the collapse area is collapsing continuously:

[0055] Conduct coagulation and strength tests on high-sulfur ore bodies and cement to obtain the optimal lime-sand ratio, and perform grouting to reinforce the loose ore according to the optimal lime-sand ratio, so that the loose ore forms a whole;

[0056] Specifically, the coagulation and strength tests of high-sulfur ore and cement are conducted to obtain the optimal ore lime-sand ratio, including:

[0057] The high-sulfur broken ore body in the collapsed area was sampled, and the loose body was mixed with No. 425 cement in different lime-sand ratios to make standard test blocks; the uniaxial compressive strength of the test blocks was measured at 3, 7, 14 and 28 days to verify whether the cohesion and strength of the high-sulfur ore body and cement met the mining requirements; based on the test results, drill holes were designed and constructed in the collapsed loose ore, and grouting reinforcement was carried out through drilling to make the loose ore form a whole, thereby improving the stability of the loose ore and exposing the top plate at the bottom to meet the requirements of mining operations.

[0058] (2.2.1) If the collapse zone does not collapse continuously:

[0059] (2.2.2) Shovel out the collapsed ore and use a 3D laser scanner to measure the shape and size of the collapsed area;

[0060] (2.2.3) Design and construct filling boreholes based on the measured shapes and dimensions, wherein the filling boreholes include filling slurry holes, vent holes and overflow holes;

[0061] Specifically, the design and construction of filling boreholes include designing filling boreholes between the normal mining access road and the top of the collapse area according to the measured conditions of the collapse area. A total of 3 boreholes are constructed, namely the filling slurry inlet hole, the exhaust hole, and the overflow hole; the boreholes are arranged so that the exhaust hole is at the highest position, the slurry inlet hole is lower than the exhaust hole, and the overflow hole is lower than the slurry inlet hole. The spacing between the filling slurry inlet hole, the exhaust hole and the overflow hole is 0.5-1m, and the hole diameter is 130mm; casing is installed in the filling slurry inlet hole, the exhaust hole and the overflow hole.

[0062] (2.2.4) transporting the prefabricated triangular steel cage to the interior of the collapsed area and laying the false bottom steel bars, wherein the prefabricated triangular steel cage includes a triangular support, a steel frame and a false bottom anchor net;

[0063] Specifically, the prefabricated triangular steel cage includes:

[0064] Triangular bracket, steel frame and false bottom anchor net;

[0065] The triangular bracket is made of φ12mm threaded steel with a length of 1.0m. They are cross-connected and welded into triangular brackets. Each set of prefabricated triangular steel cages contains 5 or more triangular brackets with a spacing between 810-900mm. The steel skeleton is connected to the vertices of the triangular bracket by three φ12mm threaded steel bars with a length of 3.5m, connecting multiple triangular brackets in series. The false bottom anchor is composed of two 2m×1mφ6mm anchor nets with a mesh size of 180mm×180mm. The two sides of the steel mesh are fixedly connected to the bottom steel skeleton and the bottom reinforcement of the triangular bracket.

[0066] (2.2.5) Concrete retaining wall is poured at the mouth of the collapsed area to seal the collapsed area;

[0067] Specifically, a concrete retaining wall is poured at the mouth of the collapsed area, including, after the false bottom steel bars are laid, a 400mm-600mm thick concrete retaining wall is poured on the normal mining access road at the mouth of the collapsed area to seal the collapsed area.

[0068] (2.2.6) Carry out filling tests on water-rich and high-sulfur crushed ore deposits to obtain the optimal ash-sand ratio, so as to fill the collapsed area with the optimal ash-sand ratio.

[0069] Specifically, a filling test of a water-rich and high-sulfur crushed ore deposit is carried out, including a lime-sand ratio experiment for grouting based on the water gushing situation in the collapsed area of ​​the crushed ore deposit, to obtain the optimal lime-sand ratio suitable for the current collapsed area, and to ensure that the uniaxial compressive strength of the filling body in the collapsed area after grouting is greater than 4.5MPa.

[0070] Embodiment 2

[0071] S201. During the stratified mining process of a water-rich, high-sulfur, broken ore body, a collapsed area appears. When the conditions for continued mining are no longer met, determine whether the collapsed area is collapsing continuously.

[0072] S202, the collapsed area is relatively stable, and the collapsed ore is shoveled out. The collapsed ore is shoveled out, and the morphology of the collapsed area is measured by a 3D laser scanner. According to the actual measurement, three filling boreholes are designed and constructed to expose the collapsed area. The false bottom steel bars are laid using a rapid reinforcement process. After the filling retaining wall is cast at the mouth of the collapsed area to seal the collapsed area, a 1:4 high-mixed lime-sand ratio is used to quickly fill and manage the collapsed area. The details are as follows:

[0073] S2021. Under the premise of ensuring safety, the collapsed ore is shoveled out. When the collapsed ore is out, the roof appears to be in a short self-stabilizing state and a certain empty chamber is formed. A three-dimensional laser scanner is used to measure the shape of the empty area. According to the measured collapse area situation, a borehole is designed and constructed at an appropriate location on site to the top of the collapse area for filling. A total of 3 boreholes are constructed, namely the filling slurry hole, the exhaust hole, and the overflow hole. The three boreholes are distributed in such a way that the exhaust hole is at the highest position in the collapse area, the slurry inlet hole is 200mm lower than the exhaust hole, and the overflow hole is 200mm lower than the slurry inlet hole. The upper inclined hole exposes the filling hole in the collapse area with a hole diameter of 130mm, and a casing is installed.

[0074] S2022. Change the existing traditional reinforcement process and design the reinforcement materials to be pre-welded and combined to form a prefabricated triangular steel cage. After the drilling construction is completed, use remote-controlled shovel equipment to transport the prefabricated steel frame to the area where reinforcement is required, and quickly complete the false bottom reinforcement laying operation without the need for personnel to enter.

[0075] The production and layout technology of prefabricated triangular steel cage is as follows:

[0076] Combined with the current mining process, in view of the fact that the mining of water-rich and high-sulfur broken ore bodies is prone to collapse, a suitable prefabricated triangular steel cage laying process is designed to be fast and efficient without the need for personnel to enter the empty area. The prefabricated triangular steel cage is composed of three parts welded together: steel triangular bracket + steel skeleton + prefabricated false bottom anchor net. A set of prefabricated triangular steel cages is 3.5m long and 1m wide, including 5 steel triangular brackets, 3 steel skeletons, and 2 beds of prefabricated false bottom anchor nets. The triangular bracket is made of three φ12mm rebars with a length of 1.0m. They are welded into triangular brackets by crossing each other according to the designed size; a set contains 5 triangular brackets with a spacing between 800-900mm. The steel frame is welded by three φ12mm threaded steel bars and triangular brackets, with a length of 3.5m. The distance between steel bars b and c and the bottom plate is about 5cm. Steel bar a is at the top of the intersection of the triangular brackets, connecting multiple triangular brackets in series. The prefabricated false bottom anchor net is set up and welded above the two steel frame at the bottom. The steel mesh is composed of two beds of 2m×1mφ6mm anchor nets with a mesh size of 180mm×180mm. Both sides of the steel mesh are welded and fixed to the steel frame and the bottom bars of the triangular bracket.

[0077] A group of prefabricated steel cages were transported to the collapsed area by a remote-controlled scraper and laid out from the inside to the outside. The distance between the reinforcement and the surrounding rock on both sides was controlled within 0.2m. This completed the efficient and fast false bottom reinforcement laying operation without the need for personnel to enter the collapsed area.

[0078] S2023. After the false bottom reinforcement is laid, a 400mm-600mm thick concrete retaining wall shall be cast at an appropriate location at the mouth of the collapsed area according to the on-site conditions to seal the collapsed area.

[0079] S2024. Based on the comprehensive application of prevention and mining technologies for large water-gushing deposits under complex geological conditions, a filling test for water-rich and high-sulfur crushed deposits was carried out. Based on the filling mechanism and filling system research of deep large water-gushing mining, the optimal lime-sand ratio of 1:4 was obtained. The collapsed area was filled with a lime-sand ratio of 1:4, and the strength of the filling body in the collapsed area was achieved to reach 4.5MPa or above, ensuring the safety of the roof exposed by the lower layer mining.

[0080] S203: When the collapsed area collapses continuously and the conditions for mining are not met;

[0081] By taking samples of high-sulfur crushed and collapsed ore bodies, the sampled bulk was mixed with No. 425 cement at different ash-sand ratios (cement: ore) in the laboratory to make standard test blocks. The uniaxial compressive strength of the test blocks was measured at 3 days, 7 days, 14 days and 28 days. The purpose is to verify whether the cohesion and strength of the high-sulfur ore body and cement meet the mining requirements.

[0082] Based on the test results, drill holes are designed and constructed in the collapsed loose ore, and grouting is used to reinforce the loose ore, so that the loose ore forms a whole, improves the stability of the loose ore, and exposes the top plate at the bottom to meet the needs of mining operations.

[0083] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for treating the collapsed area of ​​a water-rich, high-sulfur, broken ore deposit, characterized in that: include: (1) Determine whether the collapse area is continuous; (2.1) If it is judged that the collapse area is collapsing continuously: Conduct coagulation and strength tests on high-sulfur ore bodies and cement to obtain the optimal lime-sand ratio, and perform grouting to reinforce the loose ore according to the optimal lime-sand ratio, so that the loose ore forms a whole; (2.2) If the collapse zone does not collapse continuously: Shovel out the collapsed ore and use a 3D laser scanner to measure the shape and size of the collapsed area; Design and construct a filling borehole based on the measured shape and size, wherein the filling borehole includes a filling slurry inlet hole, an exhaust hole and an overflow hole; The prefabricated triangular steel cage is unmannedly transported to the interior of the collapsed area to lay false bottom steel bars, wherein the prefabricated triangular steel cage includes a triangular support, a steel frame and a false bottom anchor net; Concrete retaining wall is poured at the mouth of the collapsed area to seal the collapsed area; Filling tests on water-rich and high-sulfur crushed ore deposits were carried out to obtain the optimal ash-sand ratio, so as to fill the collapsed area with the optimal ash-sand ratio.

2. The method for treating the collapsed area of ​​a water-rich, high-sulfur, broken ore deposit according to claim 1, characterized in that: The design and construction of the backfill borehole include: According to the measured collapse area conditions, a filling borehole was designed between the normal mining access and the top of the collapse area. A total of 3 boreholes were constructed, namely the filling slurry hole, the exhaust hole, and the overflow hole. The drilling arrangement is that the exhaust hole is the highest, the slurry inlet hole is lower than the exhaust hole, and the overflow hole is lower than the slurry inlet hole. The spacing between the filling slurry inlet hole, the exhaust hole and the overflow hole is 0.5-1m, and the hole diameter is 130mm; Casings are installed in the slurry filling hole, the exhaust hole and the slurry overflow hole.

3. The method for treating the collapsed area of ​​a water-rich, high-sulfur, broken ore deposit according to claim 1, characterized in that: The filling test of the water-rich and high-sulfur crushed ore deposit comprises: According to the water gushing situation in the collapsed area of ​​the broken ore deposit, a lime-sand ratio experiment for grouting is carried out to obtain the optimal lime-sand ratio suitable for the current collapsed area, ensuring that the uniaxial compressive strength of the filling body in the collapsed area after grouting is greater than 4.5MPa.

4. The method for treating the collapsed area of ​​a water-rich, high-sulfur, broken ore deposit according to claim 1, characterized in that: The method of pouring a concrete retaining wall at the mouth of the collapsed area includes: After the false bottom reinforcement is laid, a 400mm-600mm thick concrete retaining wall is cast on the normal mining access road at the mouth of the collapsed area to seal the collapsed area.

5. The method for treating the collapsed area of ​​a water-rich, high-sulfur, broken ore deposit according to claim 1, characterized in that: The coagulation and strength test of high-sulfur ore body and cement to obtain the optimal ore lime-sand ratio includes: The high-sulfur broken ore bodies in the collapsed area were sampled and the loose bodies were mixed with No. 425 cement at different lime-sand ratios to make standard test blocks; The uniaxial compressive strength of the test blocks was measured at 3, 7, 14 and 28 days to verify whether the cohesion and strength of the high-sulfur ore body and cement met the mining requirements; Based on the test results, drill holes are designed and constructed in the collapsed loose ore, and grouting reinforcement is carried out through drilling to form the loose ore into a whole, thereby improving the stability of the loose ore and exposing the top plate at the bottom to meet the needs of mining operations.

6. A prefabricated triangular steel cage, characterized in that: The prefabricated triangular steel cage is applied to the treatment method for the collapsed area of ​​the water-rich and high-sulfur broken ore deposit as described in claims 1-5, comprising: Triangular bracket, steel frame and false bottom anchor net; The triangular bracket is made of three threaded steel bars welded into a triangular bracket. Each set of prefabricated triangular steel cage contains 5 or more triangular brackets. The steel frame uses three threaded steel bars as the frame, and the steel frame is installed on the vertices of the triangular brackets to connect the triangular brackets in series; The false bottom anchor net is composed of two 2m×1m steel meshes with a mesh size of 180mm×180mm. The false bottom anchor net is installed on the steel frame at the bottom of the triangular bracket.

7. The prefabricated triangular steel cage according to claim 6, characterized in that: The triangular bracket is made of three φ12mm threaded steel bars with a length of 1.0m, which are cross-connected to form a triangular bracket; a set of triangular steel cages contains 5 triangular brackets with a spacing between 810-900mm; The steel skeleton is connected to the vertices of the triangular bracket by three φ12mm threaded steel bars, with a length of 3.5m, connecting multiple triangular brackets in series; The false bottom anchor is composed of two 2m×1mφ6mm anchor nets with a mesh size of 180mm×180mm. Both sides of the steel mesh are fixedly connected to the bottom steel frame and the bottom reinforcement of the triangular bracket.

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