Method for reducing disasters of strong mining earthquake in surrounding cities of coal mine
A technology for cities and coal mines, which is applied in the fields of public safety and mining engineering, can solve the problems of poor anti-vibration ability, large mining space in old mines, multiple disturbances in rock formations and large range, and achieve the effect of reducing destructiveness
Inactive Publication Date: 2017-02-22
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
For old mines, large-energy mining earthquakes are prone to occur in some mining areas that have stopped mining and the central part of the goaf of mines. Large, the number of rock disturbances is large and the range is large, the rock formation is damaged after repeated movements, and the anti-vibration ability is poor
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[0017] Such as figure 1 with figure 2 As shown, a method for reducing disasters caused by strong mining earthquakes in cities around coal mines is as follows:
[0018] 1. When the working face 1 is mined to the shutdown line 2 close to the urban area 6, use the existing roadway system 7 under the coal mine to excavate two pressure relief roadways 3 in the coal seam 17 near the shutdown line 2. 3 The spacing is 15-20m, and the roadway is parallel to the stop line of the working face 2 The direction is excavated, and the area is generally 6-8m 2 , the pressure relief roadway 3 adopts blasting excavation, simple support, monitoring, pressure relief, and excavation at the same time, until it penetrates the high-stress area of the coal seam to form an artificial space, so that the energy of the goaf is slowly released to the artificial space, and the disturbance stress is intercepted and released. Deliver to other areas away from city area 6.
[0019] 2. For the goaf 18 where...
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The invention discloses a method for reducing disasters of strong mining earthquake in surrounding cities of a coal mine. The method comprises steps as follows: man-made space is established by tunneling pressure-relief roadways in a coal seam nearby a stopping line close to an urban area, so that energy in a goaf is slowly released to the man-made space; roof blasting is performed on the goaf without sedimentation, the roof is sedimented in a large area, and a buffer zone is formed; a buffer roadway is tunneled at the bottom of a key vibration rock stratum nearby urban fringe or in an adjacent layer below the rock stratum, roadway roof cutting is performed, and then, backward break-tip blast is performed; a water injection hole is drilled underground in the ground close to the urban area, the hope depth reaches below the fourth-generation weathering zone, water is injected to an incompetent bed below the weathering zone, and the incompetent bed is softened and has the closure and vibration wave intensity relieving functions. With the adoption of the measures, the ground pressure energy is substantially released, the strong mining earthquake cannot affect nearby cities, and destructiveness of the strong mining earthquake to ground buildings is reduced.
Description
technical field [0001] The invention belongs to the technical field of public safety and mining engineering. Background technique [0002] Many coal mines in my country were built in the 1930s and 1960s, and many cities developed gradually based on coal development. With the large-scale mining of coal resources, most of them are currently in deep mining, and the resource reserves are slowly drying up. Due to the large mining depth, wide range, and complex and changeable mining boundaries, high energy is accumulated in some areas due to insufficient mining. Especially the energy accumulated in the hard and complete strata, as time goes by, or when encountering strong disturbances, the key rock strata will become unstable in a large area, and mine earthquakes (similar to earthquakes) in the essential sense will occur, causing damage to adjacent cities. . For old mines, large-energy mining earthquakes are prone to occur in some mining areas that have stopped mining and the ce...
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IPC IPC(8): E21C41/18E21C37/06
CPCE21C37/06E21C41/18
Inventor 潘立友
Owner SHANDONG UNIV OF SCI & TECH