Determination method for coal mine rock burst roadway anti-impact drilling parameters

Abstract

The invention provides a method for determining anti-impact drilling parameters of a coal mine rock burst roadway, and relates to the technical field of mine safety. The method comprises the following steps: firstly, acquiring rock mechanical parameters of a coal body in surrounding rock of a to-be-scoured drilling construction roadway, and calculating the critical softening depth, critical ground stress and critical mining peak stress of the surrounding rock started by rock burst of the to-be-scoured drilling construction roadway; meanwhile, the critical mining-induced stress index of the to-be-scoured drilling construction roadway is calculated, and quantification of the impact danger is achieved; then determining a critical condition of drilling impact and a quantitative relation between the drilling impact and a critical condition of roadway impact ground pressure starting; and finally, according to the surrounding rock critical softening depth started by the roadway impact ground pressure, the drilling impact critical plastic softening area radius and the critical mining-induced stress index, the construction parameters of the anti-impact drilling are quantitatively determined. According to the method, the anti-impact drilling parameters of the rock burst roadway are quantitatively determined, so that the construction design of anti-impact drilling is more scientific and efficient.

Description

technical field [0001] The invention relates to the technical field of mine safety, in particular to a method for determining anti-scouring drilling parameters of coal mine rock burst roadways. Background technique [0002] In recent years, rock burst accidents have occurred frequently, causing a large number of roadways, equipment damage and casualties, seriously restricting economic development, and threatening the safety of underground workers. Scientific and reasonable pressure relief measures can reduce the impact tendency and danger of coal mass by changing the physical and mechanical properties of coal and rock mass, transforming the stress environment, so as to achieve the purpose of effective prevention and control of rock burst. [0003] Anti-scour drilling is the most economical and effective anti-scour method to actively relieve pressure and prevent rock burst, and it is the most widely used. Its technical essence is to artificially damage the coal body and parti...

AI Technical Summary

Problems solved by technology

However, the study found that the degree of coal damage and pressure relief in boreholes is significantly affected by many parameters such as coal impact tendency, coal uniaxial compressive strength, coal and rock residual strength, borehole diameter and borehole spacing, and roadway size. However, qualitative or statistical quantitative drilling parameter determination methods consider relatively single influencing factors and have relatively large errors.

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