Method for blocking curtain top and bottom boundary fault zone streaming

Abstract

The invention discloses a method for blocking curtain top and bottom boundary fault zone streaming. The method comprises the following steps that 1, the initial position of a fault in a curtain is determined according to geophysical prospecting and drilling data; 2, after the curtain is built, according to the initial position of the fault, the flat and open position of the ground is selected as the hole forming position of a directional hole; 3, the ground directional hole is constructed, and horizontal drilling is carried out at the position 0.5-1 time of the grouting diffusion radius above the top of the curtain; 4, in the drilling process, drilling and grouting are carried out after the curtain encounters a fault fracture zone; 5, hole sweeping is carried out till the hole bottom is grouted again; 6, a water pressure test is carried out; 7, drilling continues, and the step 4 and the step 6 are repeated till the blocking effect on all faults is achieved within the drilling range; and 8, a branch hole is constructed from the original hole forming position, horizontal drilling is carried out at the position 0.5-1 time of the grouting diffusion radius below the bottom of the curtain, and the step 4 to the step 7 are repeated. The method effectively solves the problem that the curtain generates streaming through the top and bottom boundary fault fracture zone under the action of high water pressure, the curtain achieves the expected anti-seepage effect, local thickening of the curtain on the fault zone is achieved through pressure control and quantity control grouting, and the purpose of comprehensively blocking a streaming channel is achieved.

Description

technical field [0001] The invention belongs to the technical field of mine curtain closure engineering, and in particular relates to a method for blocking flow around a fault zone at the top and bottom boundaries of a curtain. Background technique [0002] Curtain interception technology is a method of constructing curtains by drilling and grouting to block the lateral supply of water sources. However, unlike underground anti-seepage continuous walls in water conservancy and geotechnical engineering, coal mine curtains are usually realized by drilling and grouting, and their burial depth is lower than that of the underground The deeper the diaphragm wall, the more difficult it is to construct and intercept. Unlike metal mine curtains, coal mines have a larger burial and distribution range of coal seams, and the construction scale and difficulty of curtains are also greater, and most of them are not closed or semi-closed. [0003] Mine curtain construction should try to avo...

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Problems solved by technology

[0005] The present invention provides a method for blocking the flow around the fault zone at the top and bottom of the curtain, so as to solve the problems of limited fault detection range, low plugging efficiency, long construction period and high cost in the existing method

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