EFFECT OF CLAY MINERAL CONTENT ON ROCKBURST BASED ON LABORATORY TEST AND NUMERICAL SIMULATION
The aim of this paper is to study the effects of clay mineral contents on probability of rock burst from the viewpoint of laboratory test, micro-structural analysis, and numencal simulation. With the sandstone, coal, shale, and limestone specimens from the Jiahe coal mine, the rock burst tests were carried out by a true tnaxial rockburst test system developed at China University of Mining and Technology in Beijing, in which one surface can be unloaded suddenly when the sample is loaded on six surfaces at three directions. With the same test procedure for all rock samples, limestone burst occurred while sandstone and shale did not. According to the X-ray diffractions, we find that the clay mineral content in the limestone is 0％, and that the clay mineral content is 20.9％ and 44.7％ in the sandstone and the shale, respectively. Based on microanalysis, layered and flaky structures of the clay minerals determine that plastic slip may occurs in the specimens so that elastic strain energy is hard to be stored, consequently, the probability of rockburst occurrence is reduced by the existence of clay minerals. We also applied PFC (particle flow codes) to simulate the processes of rock burst occurring on the rock samples with different clay mineral contents. The tests and numencal simulations conclude that the clay mineral contents indeed affect significantly the probability: the higher the contents, the less the rock burst probability.
XIAO-MING SUN CHENG CHENG JIN-LI MIAO CHUANG-ZHOU WU
School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 10008 School of Mechanics and Civil Engineering, China University of Mining and Technology.Beijing, 100083 Department of Geotechnical Engineering, Tongji University, Shanghai, 20009, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
699-704
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）