Gob-side roadway pulse-jet roof cutting and pressure relief method

Abstract

The invention provides a gob-side roadway pulse-jet roof cutting and pressure relief method. The method comprises the steps that a row of drill holes are formed in the left side and the right side ofa gob-side roadway at certain intervals; the drill holes are detected through a drill hole penetrometer; parameters needed by roof cutting are deduced according to the compressive deformation condition; pressure relief is conducted on a rock stratum above a small coal pillar of the gob-side roadway through an electric pulse device; the cracking range of shock waves is observed through a displayerconnected to a controller, and after the expected effect is achieved, the electric pulse device is taken out, and the next adjacent drill hole shock operation is conducted till the cracking operationof the whole roadway is completely finished; roof cutting is conducted on one side of the working face of the lower section of the roadway before stoping of the working face; and after pressure reliefis completed, stability control is conducted on the rock stratum around the gob-side roadway. According to the method, deviation is not prone to occurring in the detection process, and the detectionprecision is high; meanwhile, the roof cutting speed is high, and safety is good; and in addition, power disturbance in the roof cutting process is small, original supports cannot be damaged, and therepairing effect of the method is good.

Description

technical field [0001] The invention belongs to the technical field of roof cutting and pressure relief in underground coal mines, and in particular relates to a pulse roof cutting and pressure relief method along a gob-side roadway. Background technique [0002] At present, my country's coal mining is mainly in the underground mining mode. In this mode, the hard roof is one of the main factors for the strong mine pressure in the stope. In the process of mining a coal seam with a hard roof, strong mine pressure will appear along the gob roadway. The strong mine pressure in gob-side roadway is mainly due to the hard roof, because the width and area of ​​the suspended roof near the goaf in gob-side roadway are large, the influence range of lateral bearing pressure of gob-side roadway is large, and the stress concentration is high. The surrounding rock of the empty roadway is unstable, so the support is difficult, the maintenance cost is too high and even difficult to maintain...

AI Technical Summary

Problems solved by technology

However, since the original borehole penetrating method only installs a single probe on the probe, not only the test orientation is prone to deviation when detecting the surrounding rock of the borehole, but also the test data is not accurate enough

In terms of lateral suspension of small coal pillars, traditional roof cutting uses technologies such as hydraulic fracturing and blasting pressure relief. These two technologies have disadvantages such as slow top cutting speed, large consumption of explosives, and large power disturbances.

In terms of roadway repair and reinforcement, the traditional artificial leveling repair, rigid body pillar support and traditional anchor rod reinforcement are usually used. These methods have disadvantages such as high cost, time-consuming and labor-intensive, and poor support effect.

Images