Hole multi-functionalization method for realizing water damage prevention and surface settlement control through surface borehole

Abstract

The invention discloses a hole multi-functionalization method for realizing water damage prevention and surface settlement control through a surface borehole and belongs to the coal mine green miningtechnical field. According to a grouting filling method, a single ground grouting borehole is formed downward from the ground; overlying rock located at different horizons are grouted through the grouting borehole; grouting horizons in a curved sunk zone include a low-bed-separation horizon and a high-bed-separation horizon; overlying rock fractures in a fracture zone are grouted, so that a water-blocking layer can be formed to cut off a water bursting channel of underground bed separation water damage, and therefore, secondary roof water damage can be prevented; a larger proportion of grout is adopted as the filling material of the low-bed-separation horizon so as to form a high-volume-weight rock stratum filling body; and filling bodies formed by the low-bed-separation horizon and the high-bed-separation horizon in the curved sunk zone together act on the control of surface subsidence. According to the method of the invention, a multi-horizon grouting filling project is realized through the same grouting borehole, and therefore, the utilization rate of the borehole is high, cost is low, a filling rate is improved, the subsidence-reducing rate of the surface settlement is improved, and roof water damage prevention and control is achieved.

Description

technical field [0001] The invention relates to a one-hole multi-purpose method for realizing water damage prevention and surface subsidence control by ground drilling, and belongs to the technical field of coal mine green mining. Background technique [0002] In recent years, with the gradual development of coal resources, the increase in the depth of coal seam mining, and the influence of factors such as repeated mining of coal seams and the complexity of the overlying strata structure, will lead to ground subsidence and "three under" coal pressure problems and coal seam Roof delamination water damage seriously affects the sustainable economic development of the mining area. The ground subsidence caused by mining is directly manifested as the destruction of fertile land, damage to ground buildings, and tens of billions of tons of buildings (structures) pressing coal. In addition, the delaminated water damage induced by mining is different from conventional water damage. I...

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Problems solved by technology

The existing overlying rock separation layer grouting technology controls the surface settlement through multi-layer separation layer grouting and isolation coal pillars. It is not only difficult in engineering construction, but also has a large amount of grouting work, and the separation layer filling rate is low. It will greatly affect the control effect of surface subsidence and the waste of coal resources caused by underground reserved coal pillars. In addition, the grouting process is affected by the grouting process, and the early filling process may cause water inrush accidents on the roof of the working face and grouting in the mine. The multi-drilling construction will not only increase the construction cost and cause the waste of grouting grout, but also have strict requirements on the location of the drilling holes, which seriously affects the spread of grouting and the effect of grouting

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