Roof cutting and pressure releasing method for double-filling wall structure in gob-side entry retaining

Abstract

The invention discloses a roof cutting and pressure releasing method for a double-filling wall structure in gob-side entry retaining. According to the method, a high-water material is used to construct a first high-water material filling wall on the upper section stoping working face along the edge of a gob; a row of anchor cables are arranged at the edge of the first high-water material filling wall in the propulsion direction of the upper section stoping working face; a second gangue filling wall is constructed on the sides of the anchor cables in the propulsion direction of the working face; the edge of the second gangue filling wall is drilled and filled with explosive or static crushing agents; and then roof cutting is conducted through the pre-splitting blasting effect of the explosive or the static force rock breaking effect of the static crushing agents. According to the method, the gangue wall and the filling wall are arranged to jointly support the overburden weight on the lower section working face, the supporting pressure of the filling wall is effectively relieved, and the entry retaining heaving floor amount is obviously decreased. After a roof is cut down, due to the gangue wall and the buffer distance between the two walls, the squeezing effect of overlying strata after cutting down on the first high-water material filling wall is further reduced, and the stability and safety of the working face are effectively improved.

Description

technical field [0001] The invention relates to a roof cutting and pressure relief method for a filling wall structure in a gob-side retaining entry, in particular to a method for constructing a double filling wall along with the advance of the working surface on the side of the working face in this section, and forming a double filling wall between the two filling walls. In the safe space, the roof cutting and pre-splitting drilling is arranged along the edge of the filling wall near the goaf, and the top cutting and pressure relief method is carried out by placing explosives or static breaking agents in the drilling holes. Background technique [0002] Gobside filling and retaining along the gob is to keep the conveyor roadway or airway behind the mined working face along the edge of the gob by constructing a filling wall, and use it as a non-coal pillar roadway protection method along the groove of the next working face. It can effectively avoid the waste of coal resource...

AI Technical Summary

Problems solved by technology

This method also has two deficiencies. First, the expansion cracking agent is injected into the drilling hole ahead of the working face, and the drilling hole is affected by the leading support pressure of the working face. The drilling hole will become broken and the injected slurry will flow out, affecting the crushing effect, or the slurry will Breaking through the sealing hole and spraying out will hurt the staff at the end; the reaction time of the second cracking agent is not easy to control. If the cracking agent reacts too early and the filling roadway lags behind, cutting off the side coal wall of the roadway ahead of time will affect the construction of the filling wall body

[0006] There are certain safety hazards in the roof cutting work of the side of the gob-side entry retaining by using the existing method. Therefore, it is important to find a safe and efficient method of roof cutting and pressure relief on the side of the gob-side entry retaining.

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