Steeply-inclined extra-thick hard coal seam blasting and large-diameter drilling combined pressure relief method

Abstract

The invention discloses a steeply-inclined extra-thick hard coal seam blasting and large-diameter drilling combined pressure relief method. The steeply-inclined extra-thick hard coal seam blasting and large-diameter drilling combined pressure relief method specifically comprises the following steps that firstly, in the mining process of a steeply-inclined extra-thick hard coal seam, a top plate side roadway and a bottom plate side roadway are arranged in a staggered mode, and a plurality of drilling stress meters are mounted on the two roadways and covering the whole roadway and used for monitoring roadway surrounding rock stress changes; according to the mechanical properties of a coal body and a coal seam top plate and a coal seam bottom plate, the mounting parameters of blast holes and large-diameter drill holes are determined, the large-diameter drill holes and the blast holes are formed in the top plate side roadway, and the blast holes are formed in the bottom plate side roadway; and finally, after the blasting large-diameter combined pressure relief drilling construction is completed, the pressure relief effect is evaluated according to a stress value monitored by the drilling stress meter. According to the steeply-inclined extra-thick hard coal seam blasting and large-diameter drilling combined pressure relief method, the stress concentration and the impact danger degree of the steeply-inclined coal seam can be reduced, the pressure relief effect is better, the recovery rate is effectively increased, and the steeply-inclined extra-thick hard coal seam blasting and large-diameter drilling combined pressure relief method is more suitable for the particularity of the steeply-inclined extra-thick hard coal seam.

Description

technical field [0001] The invention relates to the field of rock burst prevention and control, in particular to a method for combined pressure relief of steeply inclined extra-thick hard coal seam blasting and large-diameter drilling. Background technique [0002] Rock burst is a typical mine dynamic phenomenon, which is extremely harmful to coal mine safety production, and with the increase of mining depth, the possibility and harm of rock burst also increase. When mining steeply inclined extra-thick hard coal, due to the particularity of mining conditions and the mechanical properties of steeply inclined extra-thick hard coal seams, there are problems such as insignificant pressure relief effect, poor safety, and few related pressure relief measures during mining. [0003] Existing studies have shown that extra-thick hard coal is easy to accumulate energy when mining at the working face due to its hard mechanical effect. In order to ensure the safe and efficient producti...

AI Technical Summary

Problems solved by technology

However, the existing pressure relief measures have the following three problems: First, there are few existing measures for steeply inclined and extremely thick hard coal, and the measures currently taken cannot realize full pressure relief

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