Goaf grouting method based on pinnate horizontal branch directional drilling technology

Abstract

The invention discloses agoaf grouting method based on pinnate horizontal branch directional drilling technology. The goaf grouting method based on pinnate horizontal branch directional drilling technology comprises the following steps thatstep 1, drilling is arranged, specifically,pinnate horizontal branch directional drilling is designed in a treatment area of a fully mechanized goaf, a verticalsection, a deflecting section, and afissure zone horizontal extension section; step 2, a grouting material is determined, and the grouting material consists of cement, flyash or clay, and an accelerator; step 3, drilling and grouting operations of each directional drilling are conducted, a drill tool is first lowered and drills into the vertical section and the deflecting section, and a forward drilling grouting ishorizontally conducted.Thus, according to the goaf grouting method based on pinnate horizontal branch directional drilling technology,disadvantages of vertical drilling technology in fully mechanized working face goaf grouting technology are overcome, the pinnate horizontal branch directional drilling is constructed from the earth surface to the lower middle layer of the fissurezone, grout is filled and strengthening is conducted on goaf caving zone rock mass, underground residual cavities, and fissures, activation space of an old goafis thoroughly eliminated, and thegoaf treatment is more effective.

Description

technical field [0001] The invention relates to the technical field of geological disaster prevention and control in goafs, in particular to a goaf grouting method based on a pinnate horizontal branch directional drilling process. Background technique [0002] After 2010, the proportion of comprehensive mechanized coal mining (referred to as "mechanized mining") in my country's coal mines has increased significantly. The fully mechanized goaf has a large area, the roof has fully collapsed, and the development of the "three zones" is relatively regular. After a long period of natural compaction, the underground space after mining has gradually reached a state of "stress balance". When the construction of buildings (structures), seismic activity, and strong drainage of groundwater occur above the area, the equilibrium state is broken, the old goaf is "activated", the rock mass in the caving zone and fracture zone is re-compacted, and the remaining underground cavities are re-...

AI Technical Summary

Problems solved by technology

[0004] ①Large project volume and high project cost

[0006] ③High pipe fixing work and material consumption

Due to the large number of drilling holes, pipe fixing work is required for each drilling hole, resulting in huge material consumption and greatly increasing the project cost

[0007] ④In some areas with complex surface conditions, such as existing buildings (structures), water bodies, large terrain fluctuations, woodland and other surface obstacle areas, vertical drilling construction has problems such as difficulty in moving and delaying the construction period

At the same time, considering the influence range of the overburden rock movement angle and the width of the safety protection belt, the area of ​​goaf treatment is often far beyond the land acquisition scope of the proposed (structure) buildings, resulting in temporary land acquisition problems

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