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An experimental investigation on acoustic emission characteristics of sandstone rockburst with different moisture contents

查看全文 作　　者：SUN [1]XiaoMing;XU [1,2]HuiChen;ZHENG [3]LianGe;HE [1]ManChao;GONG [1]WeiLi 高影响力作者 机构地区：[1]State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology;[2]School of Mechanics and Civil Engineering, China University of Mining&Technology;[3]Energy Geosciences Division, Lawrence Berkeley National Laboratory高影响力机构 出　　处：《Science China(Technological Sciences)》索引2016年第59卷第10期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51374214 , 51134005 & 51574248);the Special Fund of Basic Research and Operating of China University of Mining & Technology, Beijing (Grant No. 2009QL03);the State Scholarship Fund of China 摘　　要：Rockburst occurred frequently during deep mining in China. The mechanism of rockburst is very complicated and related to many factors. In order to investigate the influence of moisture contents of rockmass on rockburst, we conducted a series of laboratory rockburst experiments of sandstone under three different moisture contents by the Modified True-Triaxial Apparatus (MTTA),in which the acoustic emission (AE) system was employed to monitor the internal damage of rock mass. A high-speed video camera was utilized to record the detail of rockburst. Based on the experimental results, the AE characteristics, such as AE count,AE energy, and AE frequency, were analyzed. The rockburst process, type, and indensity under different moisture contents were discussed. The research results show that with the increase of moisture contents, rock strength was soften, the elastic and the cumulative damage of the rock were reduced, resulting in a gradual decrease in AE cumulative counts and cumulative energy over the course of rockburst. This study provides an experimental basis and reference for better understanding to the rockburst mechanism and control. 关 键 词：声发射特性 实验室实验 岩爆过程 含水砂岩 声发射能量 水分含量 岩石强度 累积损伤
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