Downward entry filling mining method for broken ore body under the condition of footwall fissure water conduction

Abstract

The present invention discloses a method for mining a broken ore body with downward access filling under the condition of water conduction in the lower plate, which divides the ore body into upper plate ore body and lower plate ore body with reference to the water conduction belt, so as to separate the ore body in the water conduction area from the ore body in the non-water conduction area. Among them, for the ore body in the non-water conduction area, the mining field access of the upper plate ore body is arranged perpendicular to the direction of the ore body to recover the upper plate ore body mining field, so as to achieve stable recovery of the upper plate ore body; for the ore body in the water conduction area, the mining field access of the lower plate ore body is arranged along the direction of the ore body to recover the lower plate ore body mining field, and a drainage project is arranged in the mining field access of the lower plate ore body, so that the direction of the lower plate ore body access is consistent with the extension direction of the water conduction belt, and the arrangement of the ore body drainage project is achieved with the shortest path; the present invention not only greatly improves the mining environment of the ore body, realizes the optimization and improvement of the mining conditions of the ore body, but also controls the recovery cost, and does not require the coordinated management and support of a professional waterproofing technical team.

Description

Technical Field

[0001] The invention relates to the technical field of mining and filling, in particular to a downward approach filling mining method for a broken ore body under the condition of water conduction in a lower wall fissure. Background Art

[0002] At present, for inclined, broken, thick and large ore bodies with fissure water conduction conditions in the lower plate, the traditional upward approach filling mining method or downward approach filling mining method is generally adopted. On the one hand, the exposed area of ​​the roof can be reduced through tunnel approach mining. On the other hand, the ground pressure problems such as poor rock stability of the broken ore body and unsafe operation under the empty roof are dealt with through support of shotcrete mesh or high-strength filling body + steel mesh to construct an artificial false roof. However, the problem of tunnel watering during the approach mining process has not been well solved. Continuous watering of the approach tunnel not only worsens the mining environment and reduces mining efficiency, but also the water seeping from the fissures will have strong erosion and damage to the support materials and filling bodies. In the long run, it will inevitably lead to construction quality problems such as deformation and damage of the approach tunnel and substandard filling body quality, thereby greatly increasing the safety risk of approach mining operations.

[0003] The invention patent with patent application number CN202111009703.7 discloses a method for blocking the penetration of microcracks in rock formations by using CO2 mineralized nanosilica gel grouting materials. The nanofluid is injected into the upward microcrack development zone and the downward microcrack development zone through the grouting pipe and the top and bottom plate grouting boreholes respectively. The injection is stopped when the pressure no longer changes. Finally, CO2 gas is injected into the upward microcrack development zone and the downward microcrack development zone to form in-situ nanosilica gel, thereby sealing the microcracks. The implementation of this scheme requires the injection of a large amount of nanofluid into the ore body, and the implementation cost is relatively high.

[0004] The invention patent with patent application number CN201610967086.4 discloses a method for pre-draining the mine room in a large water mine, which arranges drilling chambers 2 and 3 on the vein wall between two rock drilling tunnels, and drills drainage holes 4 and 5; drainage holes 4 and 5 are arranged within the upper two sides of the mine room to be mined; drainage holes 4 and 5 are inclined upward at an angle of 5° to 15°, and the depth of the holes is ≤ the length of the mine room; determine the development of joints, fissures and broken zones in the drainage holes, insert filter pipes in the above-mentioned locations, and use directional perforation technology to increase the permeability coefficient of the development of joints, fissures and broken zones in the drainage holes. The implementation of this plan requires a professional waterproofing technical team to conduct drainage and grouting and water blocking. Not only is the work cumbersome and the cost increased, but the later on-site management is extremely difficult, especially how to coordinate the management of water prevention and control with mining work inside and outside is also a test for the mine.

[0005] In view of the above problems, it is urgent to develop a downward filling mining method for broken ore bodies under the condition of water conduction in the lower wall fissures, which can improve the mining environment of the ore body, control the mining cost, and does not require the coordinated management and support of a professional waterproofing technical team. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a downward approach filling mining method for a broken ore body under the condition of water conduction in the lower plate fissure, which can ensure the normal recovery of the ore body while greatly improving the mining environment of the ore body, and can control the recovery cost, and does not require the coordinated management and support of a professional waterproofing technical team.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: to provide a downward approach filling mining method for a broken ore body under the condition of water conduction in the lower wall fissure, which comprises:

[0008] Arrange the ore blocks along the strike of the ore body, and divide the ore blocks into the upper plate ore body and the lower plate ore body according to the fracture water conduction zone;

[0009] The ore blocks are mined in layers from top to bottom using the downward approach filling mining method. The mining approach to the upper ore body is arranged perpendicular to the strike of the ore body, and the mining approach to the lower ore body is arranged along the strike of the ore body.

[0010] After each layer mining area is mined, drainage engineering is arranged in the mining area access road of the lower ore body.

[0011] Preferably, in the first layer of each middle section ore block, the division range of the lower plate ore body partially exceeds the fracture water conduction zone.

[0012] Preferably, in each layer below the first layer, only one lower wall ore body mining access road is arranged near the outer side of the lower wall ore body.

[0013] Preferably, a 7m top column is left between each upper and lower middle ore block.

[0014] Preferably, the drainage project includes a plurality of water filter pipes laid along the extension direction of the mining access road of the lower ore body.

[0015] Preferably, the drainage project in the first layer includes setting a plurality of roof filter pipes along the length of the roof of each lower plate ore body mining access route, and setting a plurality of side wall filter pipes along the length of the corner of the access route in the outermost access route of the lower plate ore body mining.

[0016] Preferably, after laying the top plate water filter pipe on the top plate of the inlet, a waterproof layer is provided on the top of the inlet.

[0017] Preferably, after laying the side water filter pipe on the side of the inlet, a water filter layer is set on the side of the inlet.

[0018] Preferably, in each layer below the first layer, drainage works are arranged at the mining access of the lower ore body and the outermost mining access of the upper ore body.

[0019] Preferably, the drainage project in the layers below the first layer includes laying multiple side wall filter pipes at the corners of the access road to the lower ore body mining area and the outermost access road wall of the upper ore body mining area, and setting a filter layer on the side wall of the access road.

[0020] The beneficial effects of the present invention are:

[0021] The downward approach filling mining method for the broken ore body under the condition of water conduction in the lower plate fissure described in the present invention divides the ore body into upper plate ore body and lower plate ore body with reference to the water conduction belt, so as to separate the ore body in the water conduction area from the ore body in the non-water conduction area. Among them, for the ore body in the non-water conduction area, the mining field approach of the upper plate ore body is arranged perpendicular to the direction of the ore body to recover the upper plate ore body mining field, so as to achieve stable recovery of the upper plate ore body; for the ore body in the water conduction area, the mining field approach of the lower plate ore body is arranged along the direction of the ore body to recover the lower plate ore body mining field, and a drainage project is arranged in the mining field approach of the lower plate ore body, so that the direction of the approach of the lower plate ore body is consistent with the extension direction of the water conduction belt, and the arrangement of the ore body drainage project is achieved by the shortest path.

[0022] The present invention accurately divides the upper and lower plate mining areas based on mining environment identification, realizes normal mining of the ore body, and simultaneously constructs an ore body diversion and drainage project in the lower plate ore body mining area, thereby greatly improving the mining environment of the ore body and realizing the optimization and improvement of the ore body mining conditions; it also controls the mining cost and does not require the coordinated management and support of a professional waterproofing technical team.

[0023] The present invention realizes the comprehensive collection and unified discharge of water seeping from ore body fissures by flexibly arranging water filter pipes on the roof and side walls of the approach mining area, thereby avoiding the erosion and damage of the approach filling body by the previous seepage water, shortening the filling maintenance time, improving the maintenance quality and mechanical strength of the filling body, and ensuring the safety of downward approach mining operations of broken ore bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a longitudinal cross-sectional view of mining in a stope using the downward approach filling mining method for a broken ore body under the condition of water conduction in the lower wall fissure described in an embodiment of the present invention.

[0025] Figure 2 for Figure 1 Cross-sectional view of II-II.

[0026] Figure 3 for Figure 1 Cross-sectional view of III-III.

[0027] Figure 4 An enlarged longitudinal section view of the first layer and the next layer.

[0028] The markings of the components in the accompanying drawings are as follows:

[0029] 1- this middle section transport tunnel; 2- upper middle section transport tunnel; 3- upper plate ore body; 4- lower plate ore body; 5- segment transport tunnel; 6- upper and lower layer boundary; 7- layer connecting ramp; 8- layer through-vein transport tunnel; 9- layer upper plate along-vein transport tunnel; 10- upper plate filling return air shaft; 11- filling return air shaft connecting road; 12- ore chute; 13- lower plate ore body mining site access; 14- lower plate filling return air shaft; 15- upper plate mining site access filling body; 16- upper and lower plate mining area boundary 16; 17- next The outermost entrance to the stratified upper plate ore body mining area is 17; 18-collapsed ore 18; 19-filling entrance to the first stratified lower plate ore body mining area; 20-filling entrance to the next stratified upper plate ore body mining area; 21-filling entrance to the next stratified lower plate ore body mining area; 22-head filling filter pipe; 23-tail filling filter pipe; 24-roof filter pipe; 25-filter pipe hook; 26-waterproof tarpaulin; 27-side filter pipe; 28-bottom steel mesh; 29-crushed stone; 30-metal mesh and geotextile; 31. Fracture water guide belt. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0031] The present invention provides a method for mining a broken ore body with downward entry filling under the condition of water conduction in the lower wall fissure. Figures 1 to 4 As shown, it includes:

[0032] Arrange the ore blocks along the strike of the ore body, and divide the ore blocks into an upper plate ore body 3 and a lower plate ore body 4 according to the fracture water conduction zone 31;

[0033] The ore blocks are mined in layers from top to bottom using the downward approach filling mining method. The stope approach of the upper ore body 3 is arranged perpendicular to the strike of the ore body, and the stope approach of the lower ore body 4 is arranged along the strike of the ore body.

[0034] After each layer stope is mined, a drainage project is arranged in the lower ore body stope access road 13.

[0035] The ore body is divided into upper and lower plate ore bodies 4 by a fractured water guide belt 31, so as to separate the ore body in the water guide area from the ore body in the non-water guide area; wherein, for the ore body in the non-water guide area, the upper plate ore body 3 is mined by a mining access arranged perpendicular to the direction of the ore body, so as to achieve stable mining of the upper plate ore body 3; for the ore body in the water guide area, the lower plate ore body 4 is mined by a mining access arranged along the direction of the ore body, and a drainage project is arranged in the mining access 13 of the lower plate ore body, so as to make the access direction of the lower plate ore body 4 consistent with the extension direction of the fractured water guide belt 31, so as to achieve the arrangement of the ore body drainage project by the shortest path.

[0036] like Figure 1 and Figure 2 As shown, in the first layer of each middle ore block, the fractured water guide belt 31 is pushed outward a certain distance to the upper plate as the boundary of the upper and lower plate ore bodies of the first mining layer, and the division range of the lower plate ore body 4 partially exceeds the fractured water guide belt 31, so as to increase the width of the waterproof isolation layer of the ore block in the first layer, provide a larger range of waterproof top protection for the water-conducting ore body in the lower layer, and prevent more water from penetrating downward. Figure 1 and Figure 3 As shown, on the basis of a larger waterproof roof being provided in the first layer, in each layer below the first layer, it is only necessary to arrange a lower plate ore body mining access road 13 near the outer side of the lower plate ore body 4, and the layer can be drained through the drainage project arranged in the lower plate ore body mining access road 13.

[0037] The drainage project includes a number of filter pipes laid along the extension direction of the lower ore body mining access road 13. Figure 4 As shown, the drainage engineering in the first layer includes setting a plurality of top plate filter pipes 24 laid along the length extension direction of the top plate of each lower plate ore body mining access 13, and setting a plurality of side wall filter pipes 27 laid along the length extension direction of the access wall corner in the outermost access of the lower plate ore body mining. At the same time, in each layer below the first layer, the lower plate ore body mining access 13 and the outermost access of the upper plate ore body mining are arranged with drainage engineering, that is, a plurality of side wall filter pipes 27 are laid in the lower plate ore body mining access 13 and the outermost access of the upper plate ore body mining in the layers below the first layer; thereby, drainage is achieved for the top seepage surface and the side wall seepage surface of the entire ore block, and while ensuring the overall drainage effect of the ore block, the layout cost of the drainage engineering is also effectively controlled.

[0038] Furthermore, after laying the top plate filter pipe 24 on the top plate of the first layer access, a waterproof layer is set on the top of the first layer access; that is, after laying the top plate filter pipe 24 on the top plate of the first layer access, the top of the first layer access is tightly covered with a waterproof tarpaulin 26 to prevent the fissure water of the upper ore body from penetrating downward and affecting the solidification effect of the filling body. In addition, after laying the side wall filter pipe 27 on the side wall of the first layer access, a filter layer is set on the side wall of the first layer access; that is, after laying the side wall filter pipe 27 on the side wall of the first layer access, a metal mesh is used to set a shield, and a layer of geotextile is laid on the inside of the metal mesh, and finally the gap between the metal mesh and the side wall is filled with crushed stone 29; so that the seepage water in the first layer access and the filling body can be discharged from the side wall filter pipe 27.

[0039] Similarly, in each layer below the first layer, after laying the side wall filter pipe 27 on the side wall of the lower plate ore body mining access 13 and the outermost access to the upper plate ore body mining, a metal mesh is used to set up a shield, and a layer of geotextile is laid on the inside of the metal mesh, and finally, gravel 29 is used to fill the gap between the metal mesh and the side wall; so that the seepage water in the lower plate ore body mining access 13 and the outermost access to the upper plate ore body mining and the filling body can be discharged from the side wall filter pipe 27.

[0040] By flexibly arranging filter pipes on the roof and side walls of the approach mining area, we can achieve comprehensive collection and unified discharge of water seeping from the ore body fissures, avoid the erosion and damage of the approach filling body by the previous seepage water, shorten the filling maintenance time, improve the maintenance quality and mechanical strength of the filling body, and ensure the safety of downward approach mining operations in the broken ore body.

[0041] The following is an example of an iron mine in Shandong, my country, to further illustrate the downward entry filling mining method of the broken ore body under the condition of water conduction in the lower plate fissure proposed by the present invention. The ore of an iron mine in Shandong, my country is mainly magnetite, followed by skarn magnetite. The ore body has an inclination of 50° to 60°, a thickness of 12m to 45m, and an average thickness of 33m. The rock mass structure is generally fragmented, and partially blocky. The rock mass quality belongs to grade III to IV. The dominant structural surface strikes basically the same direction as the ore body, and the maximum principal stress direction is perpendicular to the ore body strike. The surrounding rocks of the upper and lower plates of the ore body are composed of pyroxene diorite and altered diorite. There is a karst fissure aquifer near the bottom plate of the mine with medium water content. There is a continuous water dripping problem along the vein tunnels in the lower plate; the hydrogeological conditions of the ore deposit are generally medium.

[0042] Divide the ore blocks: Divide the ore blocks into ore blocks every 50m along the ore body strike. The ore blocks are 50m long, 70m wide and 70m high. Leave a 7m top pillar between the upper and lower middle blocks, and no bottom pillar. Divide the ore blocks into sections every 10-15m along the height direction. The sections are connected to each other and the middle sections through the stope ramp, which serves as a public passage for the lowering of personnel, materials and equipment. According to the fractured water guide belt 31, the ore block is divided into two parts, the upper ore body 3 and the lower ore body 4. The mining access of the upper ore body 3 is arranged perpendicular to the strike of the ore body, and the mining access of the lower ore body 4 is arranged along the strike of the ore body. The specifications of the accesses are 4m×4m. Taking into account the undulation of the fractured zone along the strike, the fractured water guide belt 31 is pushed outward 6m to the upper plate as the mining boundary of the upper and lower plate ore bodies of the first mining layer. For the layers below the first layer, only one access close to the outer side of the lower plate is retained according to the drainage effect of the first layer, and the rest are mining accesses of the upper plate ore body.

[0043] Mining and cutting engineering: Mining engineering mainly includes segmented transport level tunnel 5, layered connecting road, layered through-vein transport tunnel, upper plate along-vein transport tunnel, filling return air shaft, segmented chute and related connecting roads. The mining field ramp is classified as the middle section development project and is not designed here.

[0044] The segmented transport tunnel 5 is arranged at the foot of the ore body along the direction of the ore body. It is mainly used as the mine exit channel for the mining area of ​​this segment, and also serves as the transportation channel for the personnel, equipment and materials of the mining area. The cross-sectional specification is 3.0m×3.0m.

[0045] The layered connecting road is arranged between the segmented transport tunnel 5 and the layered ore body. The layered through-vein transport tunnel is arranged in the center of the ore block perpendicular to the direction of the ore body. The upper plate along-vein transport tunnel is arranged at the upper plate boundary of the ore body along the direction of the ore body. The above tunnels are used as the outbound transportation channels of the layered access mining area, and also as the transportation channels for personnel, equipment and materials in the layered mining area. The cross-sectional specifications are 3.0m×3.0m.

[0046] There are two filling return air shafts, arranged at the boundary of the upper and lower walls of the ore body, mainly used as the return air and filling pipeline installation channels of the mining area, and also as the second safe exit of the mining area, with a cross-sectional specification of 1.5m×2.0m. In order to facilitate the up and down of personnel, a pedestrian ladder is set up inside. The filling return air shaft section below the first mining layer is welded along the way with 8mm steel plates.

[0047] The segmented chute is arranged on one side of the segmented transport tunnel 5, mainly serving as the ore discharge channel of this segment. Its lower part is connected with the middle transport tunnel, and the cross-sectional specification is 2.0m×2.0m.

[0048] The filling return air shaft connecting channel 11 is arranged at the upper middle section level, mainly serving as a connecting channel between the filling return air shaft and the upper middle section return air laneway, with a cross-sectional specification of 2.5m×2.5m.

[0049] Mining sequence: The ore blocks are mined in layers from top to bottom using the downward approach and filling mining method. The upper ore body 3 is mined first within each layer, and then the lower ore body 4 is mined. The approaches to the mining area are mined one by one or three by one, and mining is retreated from the outermost approach to the center.

[0050] Rock drilling and blasting: rock drilling is carried out using a rock drilling trolley, with a blasthole specification of φ45mm and a hole depth of 3.0-3.2m. 2# rock emulsion packaged explosives are manually loaded and digital detonators are detonated at the bottom of the hole.

[0051] Ventilation of the mining area: After each blast, the area must be ventilated for more than 30 minutes with a local fan. Only after the polluted air is completely exhausted can the working face be entered for the next process. The fresh air flows from the middle main transport lane through the mining ramp to the segmented transport lane 5, and then enters the mining operation face through the layered connecting road, the through-vein transport lane and the along-vein transport lane. After flushing the working face, the polluted air flows from the filling return air shaft into the upper middle transport lane 2, and finally merges into the main return air shaft and is discharged to the surface.

[0052] Roof management: After the blasting of the stope is completed and the ventilation is effective, the safety personnel enter the face to knock the roof. If the safety operation is still not met, steel arches and anchor spray nets should be used for reinforcement support. Safety inspections should be strengthened in a timely manner during the production process, and problems should be dealt with in a timely manner.

[0053] Ore exiting the mine: A 2m3 scraper is used to enter the access working face from the connecting ramp through the vein transport tunnel and the upper plate along the vein transport tunnel to complete the shoveling operation, and then the ore is unloaded to the segmented ore chute 12 through the segmented transport level tunnel 5. The ore is loaded into the middle section mine car under the action of the vibrating ore discharger, and finally lifted and transported to the surface by the main shaft cage.

[0054] Mining site filling: The filling process mainly includes clearing and leveling the site, setting up water filter pipes and filling hoses, laying steel mesh, building filling retaining walls, extending water filter pipes, filling along the way and setting up the filling return air shaft.

[0055] After the access road is cleaned and leveled, the water filter pipes are installed. The installation method varies depending on the spatial location of the access road. The details are as follows:

[0056] Generally, only two conventional backfill filter pipes need to be installed in the access mining area, specifically one pipe is laid along the inner periphery of the backfill retaining wall at a distance of 0.5 to 1.0 m and the other pipe is laid at the tail of the access road. The filter pipe is a 100 mm diameter blind ditch pipe with a geotextile wrapped on the outer layer, and the other end is connected to the drainage steel pipe of the backfill retaining wall.

[0057] In addition to the conventional filling and filtering pipes, the top plate filtering pipe 24 is also required to be laid in the first layer's lower plate ore body mining access 13. Specifically, 5 blind ditch pipes are laid at equal intervals of 500mm at the position of the top plate of the access, and are fixed in the top plate rock mass with U-shaped steel, and the lower part is tightly covered with a waterproof tarpaulin 26. In addition, in addition to the top plate filtering pipe 24, the first layer's outermost lower plate ore body mining access 13 is also required to lay 2 blind ditch pipes, i.e., side wall filtering pipes 27, along the corners of the access wall; after the side wall filtering pipes 27 are laid, a metal mesh with a mesh size of 100mm×100mm is used to set a shield, and a layer of geotextile is laid on the inside of the metal mesh, and finally the gap between the metal mesh and the side wall is filled with crushed stone 29.

[0058] In each layer below the first layer, only two blind ditch pipes, namely side wall filter pipes 27, are laid at the outer wall corners of the lower plate ore body mining access 13 and the outermost access to the upper plate ore body mining; then they are covered with metal mesh and geotextile, and the gaps are filled with crushed stone 29.

[0059] The filling of the mining site adopts φ100mm steel braided composite hose and the middle section filling main pipeline to extend and connect to the mining site. The filling pipeline should be equipped with drainage tees and flange valves at the entrance of the mining site to facilitate the switching of filling pipelines in the later stage. When the length of the access route is less than 20m, only one filling pipeline needs to be set up in the middle of the access route, and its outlet is fixed at the highest point of the access route; when the length of the access route is greater than 20m, two filling pipelines need to be arranged in the access route for multi-point discharge, and their outlets are fixed at the highest point of the roof about 8m away from both ends of the access route. In addition, an overflow exhaust pipe should be laid, one end of which is fixed at the highest point of the filling pipe discharge port, and the other end is laid on the outside of the filling retaining wall. The pipe specification is φ100mm plastic pipe.

[0060] The next step is to lay the steel mesh. The main reinforcement of the steel mesh is φ12mm steel bar with a mesh size of 1200mm×1000mm, and the secondary reinforcement is φ6mm steel bar with a mesh size of 400mm×500mm.

[0061] After all the above processes are completed, a filling retaining wall is built at the entrance of the access mining area. The retaining wall is built with hollow bricks, the thickness of the retaining wall is 150cm, and the surface is supported by C20 concrete spraying (thickness 50mm). There are multiple φ100mm old steel pipes wrapped with geotextiles on the retaining wall, which are connected to the filter pipe inside and the φ100mm plastic pipe is extended to the segmented drainage well outside for dehydration and drainage of the stratified mining area.

[0062] The filling and return air shaft is welded with steel molds, the thickness of which is 8mm and the height of each section is about 1.5m. When welding, the edges of the upper and lower steel molds must be highly matched and welded tightly. After completion, three layers of geotextiles are wrapped around the steel molds to prevent sand leakage.

[0063] Before unloading and filling the intake route, the drain valve should be opened, the filling valve should be closed, and the guide water in the filling pipe should be discharged. Then the formal filling can be started. When some solid particles are discharged from the pipe mouth after the slurry of the filling system is lowered, the filling valve should be opened and the drain valve should be closed. When the material is unloaded from the mining site and the pipeline is cleaned, the drain valve should be opened again and the filling valve should be closed to discharge the excess pipe washing water in the pipeline.

[0064] The filling of the access road is required to be as complete as possible, and the strength of the filling body reaches 1.0MPa at 7 days and 4-5MPa at 28 days. The filling of each access road is completed in 2-3 times, and the height of each filling is controlled at 1.5-2.0m. The next filling needs to wait until the previous filling body is initially solidified before it can be carried out. The present invention accurately divides the upper and lower plate mining areas based on the identification of the mining environment, and realizes the normal mining of the ore body. At the same time, the ore body drainage project is simultaneously constructed in the lower plate ore body mining area, which greatly improves the mining environment of the ore body and realizes the optimization and improvement of the ore body mining conditions; and the mining cost is controlled, and the collaborative management and support of a professional waterproofing technical team is not required. The present invention provides a safe, reliable and economical new method for inclined, broken, thick and large ore bodies with a permeable environment of karst caves and fissures in the lower plate. The equipment used in this method is conventional rock drilling equipment, which has a simple process, low cost and broad application prospects.

[0065] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for downward filling mining of a broken ore body under the condition of water conduction in the lower wall fissure, characterized in that: include: Arrange the ore blocks along the strike of the ore body, and divide the ore blocks into upper plate ore body and lower plate ore body according to the fracture water conduction zone; The ore blocks are mined in layers from top to bottom using the downward approach filling mining method. The mining approach to the upper ore body is arranged perpendicular to the strike of the ore body, and the mining approach to the lower ore body is arranged along the strike of the ore body. After each layer stope is mined, drainage works are arranged in the access road of the lower ore body stope; In the first layer of each middle ore block, the fracture water conduction belt is pushed outward a certain distance from the upper plate as the boundary of the upper and lower plate ore bodies of the first mining layer. The division range of the lower plate ore body partially exceeds the fracture water conduction belt, so as to increase the width of the waterproof isolation layer of the ore block in the first layer and provide a larger waterproof roof protection for the water-conducting ore body in the lower layer. On the basis of the large waterproof roof protection provided in the first layer, in each layer below the first layer, only one lower plate ore body mining access road needs to be arranged near the outer side of the lower plate ore body, and the layer is drained through the drainage project arranged in the lower plate ore body mining access road. The drainage project includes multiple drainage pipes laid along the extension direction of the lower plate ore body mining access road; the drainage project in the first layer includes setting multiple roof drainage pipes laid along the extension direction of the access road roof in each lower plate ore body mining access road, and setting multiple side wall drainage pipes laid along the extension direction of the access road side wall corner length in the outermost access road of the lower plate ore body mining.

2. The downward approach filling mining method for a broken ore body under the condition of water conduction in the lower wall fissure according to claim 1 is characterized in that: A 7m top column is left between each upper and lower middle block.

3. The downward approach filling mining method for a broken ore body under the condition of water conduction in the lower wall fissure according to claim 1 is characterized in that: After laying the top plate filter pipe on the top plate of the access road, a waterproof layer is set on the top of the access road.

4. The downward approach filling mining method for a broken ore body under the condition of water conduction in the lower wall fissure according to claim 1 is characterized in that: After laying the side filter pipe on the side of the approach, a filter layer is set up on the side of the approach.

5. The downward approach filling mining method for a broken ore body under the condition of water conduction in the lower wall fissure according to claim 1 is characterized in that: In each layer below the first layer, drainage projects are arranged at the mining access of the lower ore body and the outermost access of the mining of the upper ore body.

6. The method for downward filling mining of a broken ore body under the condition of water conduction in the lower wall fissure according to claim 5 is characterized in that: The drainage project in the layers below the first layer includes laying multiple side wall filter pipes at the corners of the access road to the lower ore body mining area and the outermost access road wall of the upper ore body mining area, and setting up a filter layer on the side wall of the access road.

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