A collapsed area united grouting construction method
    In the collapsed area or the water-sanded sand layer and the unstable rock mass of the fine-grained fracture zone, it is difficult to pass by the conventional method. The chemical grouting method or the chemical cement mixed grouting method is one of the effective special excavation methods.
    B closed wedge construction method
    Loose rock collapse when the aqueous unwatering area, within their angle of repose (+ 300), able to maintain its relative stability, the construction can be of small section closed striker wedge method. The characteristics are: not only hit the wedge around the top of the roadway, in order to prevent the working surface from flowing, use the round rods and inserts with different lengths to directly hit the collapsed rock mass of the working face, and then close it. The armpit method supports the beam column. When clearing the meteorite, you can use a saw to cut off the round rod in the meteorite while cutting into a new round rod and insert plate at the hole. After advancing for a short period (0.8~1.0m), close the working surface and start the next round of operation. The permanent support after small section excavation can be constructed by the shed support method. Closed wedge method construction. Ma Wan-shui engineering team has this method in the 850 adit dragon smoke iron ore caving by a high 30m, width 20m, length 10m collapse fault zone.
    C shield construction
    In the railway water conservancy tunnel project, the closed shield Shield made of steel structure or mixed structure has a front-end blade shape, and the shield cylinder is gradually advanced by the hydraulic jack system. Operation in a rugged steel shield shell be very safe, but complex equipment, expensive, metal and nonmetal mines rarely used.
    In the collapsed area or the water-sanded sand layer and the unstable rock mass of the fine-grained fracture zone, it is difficult to pass by the conventional method. The chemical grouting method or the chemical cement mixed grouting method is one of the effective special excavation methods.
    B closed wedge construction method
    Loose rock collapse when the aqueous unwatering area, within their angle of repose (+ 300), able to maintain its relative stability, the construction can be of small section closed striker wedge method. The characteristics are: not only hit the wedge around the top of the roadway, in order to prevent the working surface from flowing, use the round rods and inserts with different lengths to directly hit the collapsed rock mass of the working face, and then close it. The armpit method supports the beam column. When clearing the meteorite, you can use a saw to cut off the round rod in the meteorite while cutting into a new round rod and insert plate at the hole. After advancing for a short period (0.8~1.0m), close the working surface and start the next round of operation. The permanent support after small section excavation can be constructed by the shed support method. Closed wedge method construction. Ma Wan-shui engineering team has this method in the 850 adit dragon smoke iron ore caving by a high 30m, width 20m, length 10m collapse fault zone.
    C shield construction
    In the railway water conservancy tunnel project, the closed shield Shield made of steel structure or mixed structure has a front-end blade shape, and the shield cylinder is gradually advanced by the hydraulic jack system. Operation in a rugged steel shield shell be very safe, but complex equipment, expensive, metal and nonmetal mines rarely used.
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