One-hole multi-opening ground grouting filling method implemented above coal pillars

Abstract

The invention discloses a one-hole multi-opening ground grouting filling method implemented above coal pillars. According to the method, main grouting drill holes are distributed above the coal pillars among working faces, and then subjected to casing and cementing, afterwards, multiple secondary grouting drill holes are constructed from the main grouting drill holes to the working face goafs at the two sides of the coal pillars separately, and a ground grouting pump is utilized for conducting high-pressure grouting filling on the working area goafs at the two sides of the coal pillars to achieve the purpose of treating gangue and other solid waste. By means of the method, it can be avoided that grouting drill holes are constructed above goafs, thus the safety of drill hole construction and the stability of the structure of the drill holes are improved, besides, the number of the distributed grouting drill holes can be lowered, the grouting cost is reduced, and the applicability of theground grouting filling technology in the field of downhole filling of gangue, pulverized fuel ash and other solid waste is improved.

Description

technical field [0001] The invention relates to a grouting filling method, in particular to a one-hole multi-opening ground grouting filling method above a coal pillar, which is suitable for underground disposal of coal gangue and other solid wastes. Background technique [0002] In recent years, with the enhancement of social environmental protection awareness and the continuous tightening of environmental protection policies, the resistance to ground discharge of solid waste such as gangue and fly ash has become greater and greater. The ground grouting filling technology provides a green treatment method for gangue, fly ash and other solid wastes. The empty area is filled with grouting, so as to achieve the purpose of treating solid waste such as gangue and fly ash. [0003] However, the traditional ground grouting filling method has obvious disadvantages, mainly as follows: 1. After the mining of the coal seam, the overlying roof is in continuous migration, and it takes ...

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Problems solved by technology

[0003] However, the traditional ground grouting filling method has obvious disadvantages, mainly as follows: 1. After the coal seam is mined, the overlying roof is in continuous migration, and it takes several years to be completely stable. However, the traditional ground grouting The grout filling method is mostly located above the goaf, and there are certain hidden dangers in the construction safety; 2. The traditional ground grouting filling mostly uses a single borehole for grouting one by one. During the grout filling process, multiple drill holes need to be arranged to complete the grout filling, which results in relatively high grout cost

Due to the above two reasons, the application of traditional ground grouting filling technology in the underground filling of coal gangue and other solid wastes has been limited. Therefore, a safe, economical and efficient ground grouting filling method is urgently needed

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