不同速率下单双钎头破岩声发射数值分析  

Numerical experiment of acoustic emission of rock fragmentation under single or dual drill bits and different loading rates

作　　者：张孟举 赵伏军[1,2] 陈珂[1] 张柏[1] 李玉[1] 樊勇[1] 

机构地区：[1]湖南科技大学资源环境与安全工程学院,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：《河北工程大学学报（自然科学版）》2017年第1期17-20,共4页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(51474103);湖南省自然科学基金资助项目(2015JJ2070);湖南省研究生科研创新项目(CX2015B508)

摘　　要：选用脆性花岗岩为研究对象,利用岩石破裂过程分析软件RFPA2D,分别对其进行单、双钎头在不同加载速率下的数值模拟试验,得到RFPA2D应力图及相对应同一加载步下的声发射图。结果表明:较单钎头相比,岩石在双钎头协同作用下将会形成应力叠加,且钎头下面的裂纹会对相邻裂纹产生影响,裂纹尖端会产生应力集中,试件破坏释放出的声发射能量和声发射计数更大;随着加载速率的增大,试件释放的声发射总能量增大,且所得竖向载荷增大。Using the rock failure process analysis software - RFPA2D, we selected brittle granite as the object and carried out numerical crushing experiment under different loading rates, got the RFPA2D stress diagram and the acoustic emission diagram corresponding to the same loading. The results show that, compared to a single drill bit, the rock will form stress superposition inside when it is under dual drill bits, and the crack under the superposition of stress will impact on adjacent cracks, the crack tip can produce stress concentration, the crushing rock will release more energy and the counts of acoustic emission; with the increasing of loading rate, the total energy of acoustic emission and the vertical load released by the crushing rock will increase.

关 键 词：岩石破碎 单双钎头 加载速率 数值试验 声发射 

分 类 号：TD315[矿业工程—矿井建设]