A backfill retaining wall structure for upward layered mining method

Abstract

This utility model relates to a backfill retaining wall structure for upward layered mining, comprising columns, a foundation, a retaining wall, and a filter screen. The columns are vertically fixed to both sides of the stope and anchored to the side walls of the stope via anchors. The foundation is horizontally embedded and fixed to the bottom surface of the stope. The retaining wall is vertically fixed to the foundation, with its two sides fixedly connected to two columns respectively. Several filter holes are provided on the retaining wall, and a filter screen is laid and fixed on the surface of the retaining wall near the filling area. The design of the columns and foundation effectively improves the compressive strength and erosion resistance of the retaining wall, effectively enhancing the stability of the structure. Furthermore, the presence of filter holes on the retaining wall and the fixed filter screen on the surface near the filling area effectively guides and accelerates the drainage of water from the backfill, preventing excessive water accumulation, reducing the impact on the strength of the backfill, ensuring rapid consolidation of the backfill, and shortening the curing cycle.

Description

Technical Field

[0001] This utility model relates to the field of backfill mining technology, specifically to a backfill retaining wall structure for upward layered mining. Background Technology

[0002] The upward stratified mining method is a stratified mining process suitable for thick or medium-thick ore bodies. Its basic idea is to divide the ore body into several horizontal layers in the vertical direction, mine them sequentially from bottom to top, and fill the empty area after each layer is mined to serve as the working platform for the next layer.

[0003] In existing technologies, each stope requires the construction of a cutting roadway at the lowest level (i.e., the first level) of the mining area. This cutting roadway is then widened to form the stope, followed by subsequent sealing, backfilling, and the subsequent top-locking and mining of the next level. Sealing primarily utilizes retaining wall structures. Backfilling typically employs methods such as cemented backfilling or water-slurry backfilling. The backfill slurry is transported to the goaf via pipelines and gradually fills the goaf by its own weight or with auxiliary guidance. To facilitate the smooth gravity transport of the slurry along the pipelines, the backfill slurry contains a large amount of water. This water needs to be drained promptly after the slurry flows into the filling area to solidify and form the filling material. Therefore, retaining wall structures are required at the stope's front edge for sealing and water filtration.

[0004] Existing infill retaining wall structures typically employ reinforced mesh, masonry, concrete, or steel structures combined with geotextiles. While these structures can provide some degree of grout retention and water filtration, their structural stability is poor. Under the pressure of grout and water scouring, they are prone to deformation, leakage, and even collapse, leading to incomplete filling, overflow of filling water, and other safety hazards. Furthermore, their low water filtration efficiency can result in excessive residual moisture inside the filling material, affecting its consolidation strength and subsequent mining operations.

[0005] Therefore, it is necessary to study a filling retaining wall structure for upward layered mining. Utility Model Content

[0006] Therefore, the purpose of this utility model is to provide a backfill retaining wall structure for upward layered mining, which can effectively solve the problems of poor stability and poor water filtration performance of existing backfill retaining wall structures.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A backfill retaining wall structure for upward layered mining includes columns, foundation, retaining wall, and filter screen;

[0009] The columns are vertically fixed on both sides of the mine and are anchored to the side walls of the mine through anchors.

[0010] The wall foundation is horizontally embedded and fixed to the bottom surface of the mine;

[0011] The baffle wall is vertically fixed to the wall base, and its two sides are fixedly connected to two columns respectively.

[0012] Several filter holes are provided on the baffle wall, and a filter screen is laid and fixed on the surface of the baffle wall near the filling area.

[0013] Furthermore, the column and the baffle wall are fixedly connected by connecting angle steel. The connecting angle steel is L-shaped and extends vertically. The connecting angle steel includes an anchoring part and a fastening part. The anchoring part is attached to the column and fixedly connected to the side wall of the mine through anchor fasteners. The fastening part is attached to the baffle wall and fixedly connected to the baffle wall through fasteners.

[0014] Furthermore, both the columns and connecting angle steel are located on the side of the retaining wall away from the filling area.

[0015] Furthermore, a support mesh is fixed between the baffle wall and the filter screen, and the pores of the support mesh are smaller than the filter holes but larger than the pores of the filter screen.

[0016] Furthermore, the fastener passes sequentially through the filter screen, support screen, baffle wall, and fastening part from the filling area, fixing the filter screen, support screen, baffle wall, and fastening part into a whole.

[0017] Furthermore, both sides of the mine chamber are provided with side wall grooves, with the openings of the side wall grooves facing each other. The columns and connecting brackets are located in the side wall grooves, and the side walls of the baffle wall and the filter screen are located in the corresponding side wall grooves and are in contact with the bottom of the side wall grooves.

[0018] Furthermore, multiple connecting brackets are fixedly connected between the baffle wall and the wall base at intervals.

[0019] Furthermore, the side of the baffle wall away from the filling area is fixedly connected with a diagonal brace, and the lower end of the diagonal brace is fixed to the bottom of the mine.

[0020] The beneficial effects of the above technical solution are:

[0021] This invention provides a stable lateral foundation for the baffle wall by fixing columns to the side walls of the mine chamber and anchoring them to the side walls with anchors. The side walls of the baffle wall are also fixedly connected to the columns. Furthermore, a wall base is fixedly installed at the bottom of the mine chamber, and the bottom of the baffle wall is fixedly connected to the wall base, providing a stable bottom foundation that resists water erosion and prevents soil loss at the base. The design of the columns and wall base effectively improves the compressive strength and erosion resistance of the baffle wall, enhancing structural stability. In addition, several water-filtering holes are opened in the baffle wall, and a fixed water-filtering mesh is laid on the surface near the filling area. This effectively guides and accelerates the drainage of water from the filling material, preventing excessive water accumulation, reducing the impact on the strength of the filling material, ensuring rapid consolidation of the filling material, and shortening the curing cycle. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0023] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a top view of the present invention in use;

[0025] Figure 4 This is a front view of the present invention in use;

[0026] Figure 5 This is a side sectional view of the present invention in use.

[0027] Reference numerals: 1. Column; 2. Foundation; 3. Baffle wall; 4. Filter screen; 5. Mine stope; 6. Connecting angle steel; 7. Anchor; 8. Fastener; 9. Support mesh; 10. Connecting angle bracket; 11. Diagonal brace; 301. Filter hole; 501. Filling area; 502. Side wall groove; 503. Water diversion channel; 504. Drainage channel; 601. Anchorage part; 602. Fastening part; Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] This embodiment aims to provide a filling retaining wall structure for the upward layered mining method. It is mainly used for filling enclosures in the upward layered mining method, and is designed to solve the problems of poor stability and poor water filtration performance of existing filling retaining wall structures.

[0030] A backfill retaining wall structure for upward layered mining, such as Figure 1 It includes pillar 1, wall base 2, baffle wall 3, and filter screen 4.

[0031] The column 1 is vertically fixed on both sides of the mine chamber 5. The bottom of the column 1 is inserted or buried and fixed to the bottom surface of the mine chamber 5. The side wall of the column 1 is anchored to the side wall of the mine chamber 5 through the anchor 7, so that the column 1 forms a stable side fixed foundation.

[0032] In this embodiment, the direction closer to the filling area 501 is taken as the forward direction, and reference is made to... Figure 3 The upward direction; the direction away from the filling area 501 is the rearward direction, refer to... Figure 3 The downward direction.

[0033] The wall base 2 is horizontally embedded and fixed to the bottom surface of the mine chamber 5. The wall base 2 can be made of timber, or precast or cast-in-place concrete blocks. If necessary, anchors 7 can be used to pass through the wall base 2 to anchor it to the bottom surface of the mine chamber 5 to enhance its stability. The wall base 2 provides a reliable bottom fixing foundation for the retaining wall 3, and at the same time, it can resist the scouring and erosion of water flowing through the retaining wall 3, preventing the bottom support from becoming unstable.

[0034] The baffle wall 3 has several filter holes 301 for allowing water in the mud slurry to pass through after filling. A filter net 4 is laid and fixed on the surface of the baffle wall near the filling area 501. The filter net 4 is made of geotextile, which allows water to seep out normally, but intercepts the mud slurry, playing the main role of interception and filtration. It can effectively guide and accelerate the discharge of water in the filling body, avoid excessive water accumulation, reduce the impact on the strength of the filling body, ensure the rapid consolidation of the filling body, and shorten the curing cycle.

[0035] Furthermore, considering that geotextile is a soft material and easily deformed by pressure on the filter holes 301 on the baffle wall 3 during mud impact, this can easily lead to deformation or even tearing of the filter mesh 4. On the other hand, the pressure within the filter holes 301 can easily cause the filter mesh 4 to clog them. Therefore, as... Figure 2-5 A support net 9 is also fixed between the baffle wall 3 and the filter net 4. The pores of the support net 9 are smaller than the filter holes 301 but larger than the pores of the filter net 4. The support net 9 is made of steel wire mesh, which has a higher hardness than the filter net 4 made of geotextile. It mainly provides support for the filter net 4 and prevents the filter net 4 from being squeezed and deformed into the filter holes 301 under the impact of mud.

[0036] The bottom of the baffle wall 3 is vertically fixed to the wall base 2. Specifically, multiple connecting brackets 10 are fixedly connected between the baffle wall 3 and the wall base 2 at intervals to secure the baffle wall 3 to the wall base 2. One edge of the connecting bracket 10 is fixedly connected to the baffle wall 3 by fasteners 8, which are bolt kits. The fasteners 8 pass sequentially from the filling area 501 through the filter screen 4, the support screen 9, and the baffle wall 3, fixing the filter screen 4, the support screen 9, and the baffle wall 3 into a whole, thereby improving the stability of the baffle wall 3's water filtration structure. The other edge of the connecting bracket 10 is anchored to the wall base 2 by anchors 7. The anchors 7 pass downward through the wall base 2 and are anchored to the bottom of the mine chamber 5 to enhance the stability of the connection.

[0037] The two sides of the baffle wall 3 are fixedly connected to two columns 1 respectively. The columns 1 and the connecting angle steel 6 are both located on the side of the baffle wall 3 away from the filling area 501; specifically, as shown in the figure... Figure 1-5 The column 1 and the baffle wall 3 are fixedly connected by connecting angle steel 6. The connecting angle steel 6 is L-shaped and extends vertically. The connecting angle steel 6 includes an anchoring part 601 and a fastening part 602. The anchoring part 601 is attached to the column 1 and fixedly connected to the side wall of the mine 5 by anchoring fastener 7. The anchoring fastener 7 passes through the anchoring part 601 and is anchored to the side wall of the mine 5 to enhance the stability of the connection. The fastening part 602 is attached to the baffle wall 3 and fixedly connected to the baffle wall 3 by fastener 8. Similar to the connection method of connecting angle bracket 10, the fastener 8 passes through the filter net 4, the support net 9, the baffle wall 3 and the fastening part 602 in sequence from the filling area 501, fixing the filter net 4, the support net 9, the baffle wall 3 and the fastening part 602 into a whole.

[0038] Considering that the column 1 and connecting angle steel 6 will prevent drainage from occurring on both sides of the baffle wall 3, thus affecting the effective drainage area, therefore, if Figure 3 and Figure 4 Both sides of the mine chamber 5 are provided with side wall grooves 502. The column 1 and the connecting bracket 10 are located in the side wall grooves 502. The side walls of the baffle wall 3 and the filter screen 4 are located in the corresponding side wall grooves 502 and are in contact with the bottom of the side wall grooves 502, ensuring that there is no leakage of grout at the side wall joints, so that the area between the two sides of the mine chamber 5 is an effective drainage area of ​​the baffle wall 3, thereby improving drainage efficiency.

[0039] In this embodiment, a water intake channel 503 is provided on the bottom surface of the mine chamber 5 on the side of the baffle wall 3 away from the filling area 501. The water intake channel 503 is located behind the wall base 2 and parallel to the baffle wall 3. Drainage channels 504 are provided on both sides of the mine chamber 5 away from the filling area 501. The water intake channel 503 is used to centrally guide the water filtered from the baffle wall 3 and discharge the water into the drainage channel 504. The drainage channel 504 is connected to the drainage system to discharge the filtered water.

[0040] Furthermore, on the side of the baffle wall 3 away from the filling area 501, a diagonal brace 11 is fixed with bolts. The bolts pass sequentially from the filling area 501 through the filter screen 4, the support screen 9, the baffle wall 3, and the diagonal brace 11. After filling is completed, the nuts can be unscrewed to remove the diagonal brace 11, which mainly provides additional temporary support during the filling and filtration stages. The lower end of the diagonal brace 11 is anchored to the bottom of the stope 5. The anchoring method here can be easily disassembled ground nails or anchor rods for easy removal later.

Claims

1. A backfill retaining wall structure for upward layered mining, characterized in that: It includes columns (1), wall foundation (2), baffle wall (3) and filter screen (4); The columns (1) are vertically fixed on both sides of the mine (5) and are anchored to the side wall of the mine (5) through anchors (7); The wall base (2) is horizontally embedded and fixed to the bottom surface of the mine (5); The baffle wall (3) is vertically fixed on the wall base (2), and the two sides of the baffle wall (3) are fixedly connected to the two columns (1) respectively; The baffle wall (3) has several filter holes (301), and a filter screen (4) is laid and fixed on the surface of the baffle wall (3) near the filling area (501).

2. A backfill retaining wall structure for upward layered mining as described in claim 1, characterized in that: The column (1) and the baffle wall (3) are fixedly connected by connecting angle steel (6). The connecting angle steel (6) is L-shaped and extends vertically. The connecting angle steel (6) includes an anchoring part (601) and a fastening part (602). The anchoring part (601) is attached to the column (1) and fixedly connected to the side wall of the mine (5) by anchoring fastener (7). The fastening part (602) is attached to the baffle wall (3) and fixedly connected to the baffle wall (3) by fastener (8).

3. A backfill retaining wall structure for upward layered mining as described in claim 2, characterized in that: The column (1) and the connecting angle steel (6) are both located on the side of the baffle wall (3) away from the filling area (501).

4. A backfill retaining wall structure for upward layered mining as described in claim 3, characterized in that: A support net (9) is fixed between the baffle wall (3) and the filter net (4). The pores of the support net (9) are smaller than the filter holes (301) but larger than the pores of the filter net (4).

5. A backfill retaining wall structure for upward layered mining as described in claim 4, characterized in that: The fastener (8) passes through the filter screen (4), support screen (9), baffle wall (3) and fastening part (602) sequentially from the filling area (501), and fixes the filter screen (4), support screen (9), baffle wall (3) and fastening part (602) into a whole.

6. A backfill retaining wall structure for upward layered mining according to any one of claims 2-5, characterized in that: The two side walls of the mine (5) are provided with side wall grooves (502), and the opening directions of the two side wall grooves (502) are opposite. The column (1) and the connecting angle steel (6) are located in the side wall grooves (502). The side walls of the baffle wall (3) and the filter screen (4) are located in the corresponding side wall grooves (502) and are in contact with the bottom of the side wall grooves (502).

7. A backfill retaining wall structure for upward layered mining according to any one of claims 1-5, characterized in that: Multiple connecting brackets (10) are fixedly connected between the baffle wall (3) and the wall base (2) at intervals.

8. A backfill retaining wall structure for upward layered mining according to any one of claims 1-5, characterized in that: The baffle wall (3) is fixedly connected to a diagonal brace (11) on the side away from the filling area (501), and the lower end of the diagonal brace (11) is fixed to the bottom of the mine (5).

Images