动静组合载荷破岩声发射能量与破岩效果试验研究  

EXPERIMENTAL RESEARCH ON ACOUSTIC EMISSION ENERGY AND ROCK CRUSHING EFFECT UNDER STATIC-DYNAMIC COUPLING LOADING

作　　者：赵伏军[1,2] 王宏宇[1] 彭云[1] 王国举[1] 

机构地区：[1]湖南科技大学能源与安全工程学院,湖南湘潭411201 [2]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《岩石力学与工程学报》2012年第7期1363-1368,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50974059;50934006)

摘　　要：在动静组合载荷多功能试验装置上,以脆性岩石(花岗岩)为研究对象,进行不同载荷作用下的破碎试验。运用声发射系统AEwin采集岩石破碎过程中的声发射数据。基于不同加载模式下的声发射总能量和破碎体积的实测数据,分析两者之间的关系;采用破岩体积和破岩比能2个指标作为表征破岩效果的参量,综合分析各种加载模式下的破岩效果。结果表明:岩石破碎声发射累计能量与破碎体积有密切相关性,动载荷、动静组合载荷和静载荷下破碎单位体积岩石释放的声发射累计能量分别为WD,WS+D,WS,且WD<WS+D<WS;组合载荷破岩的声发射累计能量和破碎体积较纯动载或纯静载大,且存在最优加载参数组合,可使破岩体积达到最大且破岩比能最小。Crushing tests of brittle rock（granite） under different dynamic and static loads are conducted on multi-functional static-dynamic coupling loading testing apparatus. The acoustic emission system AEwin is applied to collect the acoustic emission data in the rock crushing process. Based on the measured data, the relationship between total acoustic emission energy and rock crushing volume under different loading patterns is analyzed. The rock crushing volume and rock-breaking specific energy are used as parameters which can characterize the rock breaking effect to synthetically analyse the effect of rock fragmentation under various kinds of loading patterns. The results show that： （1） There exists a close correlation between the total acoustic emission energy and crushing volume, and the relation of acoustic emission energy per breaking volume under dynamic loading, static loading and static-dynamic coupling loading is WD〈 WS＋D〈 Ws, where, WD, Ws and WSD are the acoustic emission energy per breaking volume under dynamic loading, static loading and static-dynamic coupling loading, respectively. （2） The total acoustic emission energy and crushing volume under static-dynamic coupling loading are more larger than that of dynamic loading or static loading： and there is an optimal loading combination which can make the total acoustic emission energy and rock-breaking volume both reach to the maximum but the rock-breaking specific energy to the minimum.

关 键 词：岩石力学 动静组合载荷 岩石破碎 声发射 破岩效果 

分 类 号：TU45[建筑科学—岩土工程]