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CN-224213269-U - Mining area ecological restoration and foundation treatment structure based on microbial mineralization

CN224213269UCN 224213269 UCN224213269 UCN 224213269UCN-224213269-U

Abstract

The utility model relates to a mining area ecological restoration and foundation treatment structure based on microorganism mineralization, which comprises a middle-shallow layer microorganism stone three-dimensional reinforcement structure, wherein microorganism solution and reaction liquid are injected through a pre-buried grouting pipe, calcium carbonate sediment cemented stone is generated to form a three-dimensional reinforcement layer, rapid drainage is performed, the bearing capacity of a foundation is improved, a deep layer is sealed by adopting three layers of polyvinyl chloride films, a vacuum combined preloading system is formed by combining a horizontal drainage cushion layer and a drainage plate, deep water drainage is accelerated, backfill soil is mixed with foreign soil by utilizing mine tailing mud, the tailing mud is recycled by layered paving and rolling, a disc pit tunnel is formed by disc cutting along the wall of the mine pit, and reserved curb and upright posts ensure passing safety, and cut stone is recycled. The horizontal/vertical observation standard pole is used for assisting in monitoring the foundation displacement and settlement. The utility model solves the problems of tail mud piling, low construction efficiency and foundation stability, and has the advantages of environmental protection, economy and high efficiency.

Inventors

  • ZHANG ZHICHAO
  • HUANG RUFA
  • ZHENG CHANGJIE
  • XIAO YANG
  • CHEN YUMIN
  • ZHANG WENGANG
  • QI CHANGGUANG

Assignees

  • 福建省地质工程勘察院

Dates

Publication Date
20260508
Application Date
20250430

Claims (8)

  1. 1. Mining area ecological restoration and foundation treatment structure based on microorganism mineralization, characterized by comprising: The microbial stone-breaking three-dimensional reinforcing structure (01) is arranged in a middle shallow backfill soil foundation and consists of crisscrossed cuboid stone layers, and is used for rapidly discharging foundation moisture and forming a three-dimensional reinforcing structure through grouting; backfill soil (02) is prepared by mixing mine tailing slurry with external soil body, filling a mine pit and forming a backfill soil foundation; the polyvinyl chloride film (03) is paved in the deep backfill foundation and is used for sealing and carrying out vacuum combined preloading reinforcement; A horizontal drainage cushion layer (04) arranged in the deep foundation for collecting the water discharged during vacuum combined preloading; The drainage plates (05) are arranged in the deep backfill foundation at intervals and are used for vertically draining water; A pit coiling tunnel (24) which is formed by coiling downwards along a pit wall (23) and is used for transporting backfill materials and providing an operation space, wherein a curb (26) is arranged at the outer side of the pit coiling tunnel (24), and an upright post (27) is arranged in the pit coiling tunnel; The horizontal observation standard pole (11) and the vertical observation standard pole (12) are respectively arranged at the two sides and the central line of each layer of vacuum combined preloading foundation and used for observing the horizontal displacement and settlement of the foundation.
  2. 2. The mining area ecological restoration and foundation treatment structure based on microbial mineralization according to claim 1, characterized in that the cross-section side length of the crushed stone layer of the microbial crushed stone three-dimensional reinforcement structure (01) is 50-100 cm, the horizontal and vertical distances are 3-5 m, and the height extends from the middle of the mining pit to the top surface (21) of the mining pit.
  3. 3. The mining area ecological restoration and foundation treatment structure based on microbial mineralization according to claim 1, wherein grouting flower pipes are pre-embedded in the crushed stone layer and are used for injecting microbial solution and reaction liquid through the grouting flower pipes after foundation drainage is completed so as to generate calcium carbonate precipitation and cement the crushed stone layer to form a three-dimensional reinforcing structure.
  4. 4. The mining area ecological restoration and foundation treatment structure based on microbial mineralization according to claim 1, characterized in that the water content of the backfill (02) is controlled within + -3% of the optimal water content.
  5. 5. The mining area ecological restoration and foundation treatment structure based on microbial mineralization according to claim 1 is characterized in that three layers of polyvinyl chloride films (03) are paved, the vacuum degree under the films is not lower than 80kPa, the thickness of the horizontal drainage cushion layer (04) is 30-50 cm, the intervals between the drainage plates (05) are 0.8-1 m, and the plate lengths are 9-12 m.
  6. 6. The mining area ecological restoration and foundation treatment structure based on microbial mineralization according to claim 1, wherein the gradient of the pit tunnel (24) is less than 6%, the width is not less than 6m, the height is 3-5 m, the curb (26) is a continuous rock mass reserved on the outer side of the pit tunnel, the thickness is 5-10 cm, the stand columns (27) are square section rock masses, the side length of the section is 1-2 m, the thickness is 20-50 cm, and the stand column spacing is 5-8 m.
  7. 7. The mining area ecological restoration and foundation treatment structure based on microbial mineralization according to claim 1, wherein the horizontal observation benchmarks (11) and the vertical observation benchmarks (12) are arranged at intervals of 50m, the vertical observation benchmarks (12) are positioned at the central line of each layer of vacuum combined preloading foundation, and the horizontal observation benchmarks (11) are positioned at two sides of each layer of foundation.
  8. 8. The mining area ecological restoration and foundation treatment structure based on microbial mineralization according to any one of claims 1 to 7, characterized in that the pit bottom (22) is a starting point of backfill, the pit top surface (21) is the elevation of backfill completed, and the backfill construction is completed and then used as the foundation of engineering construction site.

Description

Mining area ecological restoration and foundation treatment structure based on microbial mineralization Technical Field The utility model relates to the technical field of mine restoration, in particular to a structural design integrating ecological restoration and backfill foundation treatment of a mining area, which is particularly suitable for engineering practice of backfilling and reinforcing a mining pit and recycling tail mud by utilizing a microorganism mineralization technology. Background In the field of mining, a large number of left concave mining pits (pits) generally have the problems of broken topography, unstable side slopes, accumulated water accumulation, and the like, and tail mud (a mixture of fine stone powder and water, with more particle size of less than 75 mu m, high compressibility and low strength) generated by mining faces the dilemma of high piling cost, high pollution risk, occupation of land resources, and the like due to lack of effective treatment measures. The traditional pit backfilling method has the following problems: 1. The backfill soil source depends on an external soil body, so that the cost is high and the soil source is scarce; 2. the tail mud is directly piled up to easily cause geological disasters (such as landslide and debris flow), and pollute soil and water; 3. The foundation treatment means (such as simple compaction and chemical reinforcement) has low efficiency and long period, and can cause secondary pollution; 4. the construction passageway adopts ladder excavation more, and rock mass excavation volume is big, the cost of transportation is high, and the progress is slow. In the prior art, multiple requirements of ecological restoration, tail mud absorption and foundation reinforcement are difficult to be considered, and an environment-friendly and efficient comprehensive treatment scheme is needed to solve the problems that in ecological restoration of a mining area, tail mud is difficult to pile up and store, backfill soil sources are insufficient, foundation treatment efficiency is low, pollution is easy to occur, construction channel excavation cost is high and the like, and the problems of unification of environment friendliness, economy and high efficiency of pit backfill and foundation reinforcement are difficult to realize. Disclosure of utility model Aiming at the problems existing in the prior art, the utility model provides a mining area ecological restoration and foundation treatment structure based on microbial mineralization, which is characterized in that a disc pit tunnel transportation system, a layered vacuum combined preloading and microbial stone three-dimensional reinforcement structure are constructed in a mining pit, mine tailing is used as a backfilling material, stone is cemented by combining a microbial mineralization grouting technology to form a high-strength foundation, and tailing absorption, mining pit backfilling and foundation reinforcement are synchronously realized. In order to achieve the aim of the application, the utility model adopts the following technical scheme that the mining area ecological restoration and foundation treatment structure based on microorganism mineralization comprises: The microbial stone-breaking three-dimensional reinforcing structure is arranged in a middle shallow backfill soil foundation and consists of crisscrossed cuboid stone layers, and is used for rapidly discharging foundation moisture and forming a three-dimensional reinforcing structure through grouting; Backfilling, namely mixing mine tailing mud with external soil, filling a pit and forming a backfilling soil foundation; the polyvinyl chloride film is paved in the deep backfill foundation and is used for sealing and carrying out vacuum combined preloading reinforcement; The horizontal drainage cushion layer is arranged in the deep foundation and is used for collecting water discharged during vacuum combined preloading; the drainage plates are arranged in the deep backfill foundation at intervals and are used for vertically draining water; The pit coiling tunnel is formed by coiling and downwards cutting along the pit wall and is used for transporting backfill materials and providing an operation space, a curb is arranged at the outer side of the pit coiling tunnel, and an upright post is arranged in the pit coiling tunnel; The horizontal observation standard pole and the vertical observation standard pole are respectively arranged at the two sides and the central line of each layer of vacuum combined preloading foundation and are used for observing the horizontal displacement and settlement of the foundation. Further, the side length of the cross section of the gravel layer of the microbial gravel three-dimensional reinforcing structure is 50-100 cm, the horizontal and vertical distances are 3-5 m, and the height of the gravel layer extends from the middle of the pit to the top surface of the pit. Further, the grouting floral tube