A pressure-relieving method of impulse roof cutting in gob-side roadway

Abstract

The invention provides a method for pressure relief by pulse cutting of gob-side roadway. On the left and right sides of gob-side roadway, a row of boreholes are respectively arranged at a certain interval; The parameters required for roof cutting are inferred from the deformation; the electric pulse device is used to relieve the pressure on the rock formation above the small coal pillar along the gob roadway; the range of shock wave fracturing is observed through the display connected to the controller, and the electric pulse is taken out after the expected effect is achieved. device, to carry out the impact operation of the next adjacent drilling hole until the fracturing operation of the entire roadway is completed; on the side of the working face in the lower section of the roadway, the roof is cut before the working face is recovered; after the pressure relief is completed, the roadway along the gob Surrounding rock formations for stability control. The detection process of this method is not easy to deviate, and the detection accuracy is high. At the same time, the top cutting speed is fast, the safety is good, and the power disturbance in the top cutting process is small, and the original support will not be damaged. Moreover, the repair effect is good.

Description

Technical field [0001] The present invention belongs to the field of cutting pressure under the coal mine, and in particular, the present invention relates to a method of removing the cutting pressure along the empty lane pulse. Background technique [0002] At this stage, my country's coal mine mining is mainly well working mining mode. In this mode, hard top plate is one of the main factors of strong mineral pressure in the field. During the mining of coal sections with a hard top plate, a strong mine pressure appeared along the empty roadway. The strong mineral pressure along the empty roadway is mainly because the top plate is hard. Due to the large-channel roadway near the vacuum area, the pressure in the side of the roadway is large, the stress is concentrated, and the static load is caused The instability of the surrounding rock in the airwayway, so the difficulty of support is large, and the maintenance cost is too high or difficult to maintain. The dynamic roadway is com...

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.

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