Large-diameter borehole pressure relief effect evaluation method based on borehole stress monitoring

Abstract

The invention discloses a large-diameter drill hole pressure relief effect evaluation method based on drill hole stress monitoring. The method is suitable for being used in the field of mine safety. The method comprises the following steps: selecting two large-diameter drilling construction positions and construction parameters in an advanced area of a working face, mounting a drilling stress meter in the middle of the two large-diameter drilling construction positions, monitoring the stress value change condition of the stress meter, comparing stress values of areas not influenced by large-diameter drilling, subtracting the stress values of the two stress meters, and drawing a time-stress change rate curve. And accurate evaluation of the pressure relief effect of the large-diameter drill hole is obtained. According to the method, the stress value change condition near the large-diameter drill hole is collected, the pressure relief effect of the large-diameter drill hole is accurately obtained by comparing the stress value of the area not affected by the large-diameter drill hole, and the optimal pressure relief parameter interval of different danger areas is determined; the impact danger is reduced, the anti-impact cost input is reduced, the labor intensity is reduced, the working time of personnel in an impact dangerous area is shortened, and safe production of a mine is ensured.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a pressure relief effect evaluation method for large-diameter boreholes based on borehole stress monitoring. Background technique [0002] In recent years, my country's coal mines have successively entered the second depth space (500m-2000m). With the increase of mining depth, the mining conditions have become more and more complex, intertwined by multiple factors such as faults, thick and hard roofs, irregular coal pillars, and high geostress areas. The threat of rock burst disasters is more prominent, and rock burst dynamic disasters have become one of the important problems restricting the safe and efficient production of mines. At the same time, it is difficult to test the effectiveness of large-diameter drilling pressure relief measures for mining areas with impact risks. At present, large-diameter drilling pressure relief is generally used in ...

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Problems solved by technology

At the same time, it is difficult to test the effectiveness of large-diameter drilling pressure relief measures for mining areas with impact risks. At present, large-diameter drilling pressure relief is generally used in mines, which not only lowers work efficiency, but also increases the labor intensity of workers to a certain extent. Staying in the dangerous area for a long time causes a waste of resources and affects the economic benefits of the coal mine

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