Gangue filling and grouting construction method suitable for horizontal working face of short wall roadway

Abstract

The invention discloses a gangue filling and grouting construction method suitable for the horizontal working face of short-wall roadway mining, and relates to a gangue filling and grouting construction method. Grouting pipes are respectively arranged in the upper, middle and lower areas of the level roadway to realize Simultaneous grouting in multiple areas of the level roadway, the grouting effect is better; the grouting effect monitoring link is designed, and the grouting effect is monitored by drilling and coring method, which realizes the adjustment of short-wall roadway mining according to the feedback of the actual effect on site. The parameters of gangue filling grouting in the horizontal working face; grouting holes are set inside the entryway, and the grouting gangue accumulations that do not meet the strength requirements are treated with grouting to increase the strength; after the grouting is completed, the grouting pipe of the entryway No recycling, avoiding the secondary damage of the grouting gangue filling body caused by the recycled grouting pipe; hanging glue silk cloth on the coal pillar coal wall on both sides of the entry road to prevent the grout from eroding the coal seam and affecting the coal quality, reducing the impact on the coal seam. Production costs are relatively cheap.

Description

technical field [0001] The invention relates to a gangue filling and grouting construction method, in particular to a gangue filling and grouting construction method suitable for the horizontal working face of short-wall roadway mining. Background technique [0002] In order to effectively reduce mining subsidence and subsidence damage, gangue filling, as a green mining technology, is widely used in coal mine production. The filling effect of gangue has an important relationship with the density, filling rate, integrity and strength of gangue. In order to effectively improve the effect of filling and reducing settlement of gangue, many scholars have proposed the mining method of gangue filling and grouting. It is a comprehensive subsidence reduction technology combined with slurry reinforcement and mining. The basic principle is that on the basis of gangue filling, high-pressure slurry is injected into the gangue filling body, and the fluidity of the slurry is gradually pene...

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Problems solved by technology

Document 2 (Feng Wulin. Discussion on the control of surface subsidence by gangue and fly ash filling mining [J]. Coal Mine Modernization, 2015, 1: 106-107+109) proposed a method for controlling surface subsidence by gangue and fly ash filling mining. The basic principle is Firstly, the mixture of fly ash and gangue is filled. The filling process is a parallel operation method of mining while filling and compacting. Mining before the frame and filling after the frame are carried out simultaneously; then the strength of the filling body is improved by grouting. The gangue body is reinforced by grouting (grouting), and the grouting materials are fly ash, high-water materials and water with good fluidity. It is sent out from the roadway and connected with the grouting station; this method has great interference to production, the demand for fly ash is large and the cost is relatively high, and the grouting effect is poor due to the grouting treatment

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