The Method of Using Aeolian Sand to Fill the Net Cage to Construct the Wall of Gob-side Entry Retention

Abstract

The invention relates to a method for constructing a wall body for retaining and protecting a roadway along a goaf by filling a net cage with aeolian sand. The method includes the following steps: firstly, filling the net cage to be filled which consists of a steel wire net cage and geotextile and is closed at four corners and opened at the upper part with the aeolian sand, vibrating and compacting, wherein the aeolian sand has the bearing capacity due to lateral restraint provided by the steel wire net cage and the geotextile; and effectively controlling the rotation and subsidence of roof strata of the retained roadway along the goaf after the wall body for retaining and protecting the roadway along the goaf built by the net cage filled with the aeolian sand is connected to the roof. According to the method for constructing the wall body for retaining and protecting the roadway along the goaf by filling the net cage with the aeolian sand, on the premise of not consuming water resources, the bearing performance of the aeolian sand is fully brought into play, and the effective support from the wall body for retaining and protecting the roadway along the goaf constructed by fillingthe net cage with the aeolian sand to the roof strata of the retained roadway along the goaf is guaranteed, so that the cost of retained the roadway along the goaf in the desertified arid mining areais reduced, the coal resource extraction rate in the mining area is improved, and meanwhile, the influence and damage of mining activities on the water resources and the local ecological environment are reduced.

Description

technical field [0001] The invention relates to a method for controlling the stability of the surrounding rock of a roadway in an underground coal mine mining area, in particular to a method for constructing a roadway retaining wall along a gob by filling a cage with aeolian sand. Background technique [0002] Coal resources in Northwest my country are mostly distributed in arid, semi-arid deserts or Gobi areas, where water resources are scarce and the ecological environment is extremely fragile. Improving the recovery rate of coal resources and reducing the consumption of water resources in mining activities are effective ways to achieve sustainable development in arid and semi-arid mining areas in Northwest China. Gobside retaining is to artificially build a roadway protection wall on the side of the goaf of the mining roadway after the working face is pushed through, to isolate the goaf and support the roof of the roadway, and to reserve enough space in the original roadw...

AI Technical Summary

Problems solved by technology

The coal seams in the Northwest Desert or Gobi Mining Area are shallowly buried, the bedrock is thin, the ground pressure is low, and the surface is short of water and sandy. The current construction technology of the gob-side retaining roadway protection wall is not suitable for application in the Northwest Desert or Gobi Mining Area.

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