Continuous three-dimensional stress monitoring in roof of coal mines for investigating the rockburst control effect with hydraulic fracturing

The occurrence of rockburst in coal mines is closely related to the stress and rock mass. Through hydraulic fracturing measurements roof, three-dimensional roof before after as well during working face advancing was monitored, effect on controlling studied. test results show that (1) fracturing, three principal stresses decreased remarkably, whose maximum reduction about 20%, while elastic strain energy by 31% well; (2) advanced, front would increase continuously until reaching peaks induce strata fracture, variation basically consistent with magnitude stress; (3) position peak moved from 11 21 m face, decreased, 32%, also significantly 51%. field investigation shows can release mass instantaneously, will reduce risk rockburst; be an effective pre-destressing method concentration mining, prevent rockburst.