Fully mechanized mining goaf grouting method based on clustered arrangement multilateral well directional drilling

Abstract

The invention discloses a fully mechanized mining goaf grouting method based on clustered arrangement multilateral well directional drilling. The method is applied to a fully mechanized mining goaf which is buried in depth of over 400 m. The method includes the following steps that (1) drilled holes are distributed, specifically, the positions and the number of clustered arrangement multilateral directional drilling are designed in a treatment area of the fully mechanized mining goaf; (2) a grouting material is determined and composed of cement, coal ash or clay and a setting accelerator; and(3) drilling and grouting operations of the plurality of clustered arrangement multilateral directional to-be-drilled holes are performed. Accordingly, the clustered arrangement multilateral directional drilled holes are flexibly applied to the field of geological disaster prevention and control of the fully mechanized mining goaf creatively, the drilling workload is substantially reduced, consumption is reduced, thus the drilling cost is effectively reduced, meanwhile by means of the advantage that the trajectory of the drilled holes can be controlled, the covering range of drilling and grouting is widened, the accuracy of drilling and grouting is improved, the repeated drilling work is avoided, the project efficiency is remarkably improved, and the better goaf treatment purpose is achieved.

Description

technical field [0001] The invention relates to the technical field of geological disaster prevention and control in goafs, in particular to a fully mechanized goaf grouting method based on directional drilling of cluster multi-branch wells. Background technique [0002] Since the large-scale mining of coal in the 1980s, while boosting the rapid economic development, it has brought a series of geological and environmental problems, such as ground subsidence, damage to buildings, roads, ground and underground water systems, and damage to farmland and forest vegetation in villages. Wait. In particular, the existence of a large number of goafs in fully mechanized mining has a large affected area, the roof has fully collapsed, and the development of the "three belts" is relatively regular. The use of land above the area has become an inevitable practical problem, and many construction projects have to face the problem of goaf management. [0003] When the construction of build...

AI Technical Summary

Problems solved by technology

[0007] 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

[0008] 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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