Gangue filling three-dimensional grouting construction method of short-wall roadway mining horizontal working face

Abstract

The invention discloses a gangue filling three-dimensional grouting construction method of a short-wall roadway mining horizontal working face and relates to a gangue filling grouting construction method. Two-side grouting pipes on the two sides of the bottom of a roadway, a plurality of horizontal grouting pipes connected between the grouting pipes on the two sides, and vertical grouting pipes vertically fixedly connected with the horizontal grouting pipes are designed, a stable frame-type structure is formed, after gangue stacking, grouting is conducted, and the better grouting effect is guaranteed through the three-dimensional grouting process; fixing diagonal bracings are designed between the horizontal grouting pipes and the vertical grouting pipes to enable the frame-type structure to be more stable; and after grout in the vertical grouting pipes is solidified, supporting pipes containing the solidified grout are formed, under the effect of the grout, the supporting pipes and gangue stacking bodies form joint bearing bodies to support overlying strata jointly, thus sinking of the overlying strata is small, and the ground surface dust reduction effect is good.

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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