采矿与安全工程学报2017，Vol.34Issue(5)：876-883,8.DOI:10.13545/j.cnki.jmse.2017.05.008
深部煤层底板岩层卸荷动态响应的变形破裂特征研究
Mechanical mechanism of dynamic fracture evolution of coal floor unloading in deep mining
摘要
Abstract
Thespatial distribution characteristics and changes with time for three dimensional ground stress field of coal floor are illuminated by usingtheoretical analysis and numerical simulations. Me-chanical mechanism of dynamic fracture evolution under the multiple mechanics parameters of coal floor in deep mining is revealed. According to the analysis results, the redistribution of 3D stress field is got. Because of the major principal stress concentration and direction deflection, the size and shape of the major principal deviator stress could change. That cause the microfractures initiate and propagate. The zone in the coal floor is divided into four areas, unaffected area, interfacial transition area, major-principal stress concentration area, pressure drop and expansion area according to the variability of ma-jor principal stress. Compared with measured data, the change of going from fractured rock mass inte-gral continuity to macroscopic fracture above the major principal stress concentration areas has three phases, which are the random microcracks for the advanced abutment pressure, stable growth of micro cracks for the concentration of the major principal deviator stress and macroscopic failure for mutational collaboration of numerous tiny cracks. The research results provide a theoretical basis for the rapid de-termination and active control of the dangerous area of coal floor in deep mining.关键词
深部煤层底板/扰动分区/裂隙演化/力学机制Key words
coal floor in deep mining/the sections of mining disturbance/cracks evolution/mechanical mechanism分类
矿业与冶金引用本文复制引用
李家卓,谢广祥,王磊,李杨..深部煤层底板岩层卸荷动态响应的变形破裂特征研究[J].采矿与安全工程学报,2017,34(5):876-883,8.基金项目
国家自然科学基金煤炭联合基金重点项目(U1361208) （U1361208）
973前期预研资助项目(2014CB260403) （2014CB260403）
安徽省自然科学基金项目(1408085MKL42) （1408085MKL42）
