Three-dimensional grouting construction method of gangue filling in horizontal working face of short-wall roadway

Abstract

The invention discloses a three-dimensional grouting construction method for gangue filling in a horizontal working face of a short-wall roadway, relates to a gangue filling and grouting construction method, and designs two-side grouting pipes, connections and two-side grouting on both sides of the bottom of a level roadway A number of horizontal grouting pipes between the pipes and vertical grouting pipes vertically and fixedly connected to the horizontal grouting pipes form a stable frame structure. Grouting is carried out after the gangue is piled up. The three-dimensional grouting process ensures a better Grouting effect; fixed diagonal braces are designed between the horizontal grouting pipe and the vertical grouting pipe to make the frame structure more stable; after the grout inside the vertical grouting pipe is solidified, a support pipe containing solidified grout is formed inside, and Under the action of the slurry, the rain gangue accumulations form a common carrier and jointly support the overlying strata, so that the subsidence of the overlying strata is small, and the dust reduction effect on the surface is better.

Description

technical field [0001] The invention relates to a gangue filling and grouting construction method, in particular to a three-dimensional grouting construction method for gangue filling in a horizontal working face of a short-wall roadway. 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 pen...

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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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