Gob-side entry retaining method for anchor bolt network gangue bag wall body for coal mining without pillars

Abstract

The invention discloses a gob-side entry retaining method for an anchor bolt network gangue bag wall body for coal mining without pillars. The gob-side entry retaining method comprises the following steps of: A, crushing solid wastes obtained by separating tunneling gangue and/or coal gangue until the granularity is small than 0.1m and bagging by adopting plastic woven bags to obtain gangue bags; B, conveying the gangue bags obtained in the step A to the position of a working surface, which is used for building an entry, through an underground conveying system and fixing the gangue bags for building a roadside gangue bag wall body to form a gob-side entry; C, arranging the gangue bag wall body into a plurality of steps with different heights; and D, building the gangue bag wall body to the designed position and height and then mounting anchor bolts and paving a metal net, and simultaneously, paving a vertical protection steel belt, carrying out two-way anchoring or single-side pretightening in a large-pallet lane and keeping a gangue bag filling body in the gangue bag wall body in a three-dimensional stress state to achieve the functions of increasing the side pressure of the gangue bag filling body and improving the strength and the rigidity of the filling body.

Description

technical field [0001] The invention relates to a method for a coal pillar-free mining mode, in particular to a gob-side entry retention technology for a coal pillar-free mining mode. Background technique [0002] Gob-side entry retention technology has been an important technical development direction of coal mining in my country since it began to be used in my country in the 1950s. The popularization and application of the coal-pillar-free filling mining mode is an important part of exploring and realizing energy-saving and emission-reducing circular economy ideas and implementing the strategy of sustainable development of human survival in the current coal mine production and construction in my country. A lot of work has been done in research, and the technology of gob-side entry retention in thin and medium-thick coal seam coal mining faces with better conditions has been perfected day by day. As it becomes more mature, there are many roadside support methods for gob-side...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects in the above-mentioned prior art, the present invention provides a method for retaining roadways along the gob with anchor bolt mesh gangue bag wall for mining mode without coal pillars, and solves the problem that the existing technology cannot realize high cost of roadside support materials and early wall formation. The technical problems of strong and large rigidity support, lateral compression resistance, longitudinal compression resistance and proper pressure yielding, as well as the simplification of the entry retaining process, reduce the cost of coal mine filling and improve the operation efficiency of the mining mode without coal pillars

Images