期刊文献+

岩石断裂过程区孕育规律与声发射特征实验研究 被引量:14

Experimental study on incubation and acoustic emission characteristics of rock fracture process zones
原文传递
导出
摘要 为研究岩石断裂过程区孕育规律及声发射特征,采用直裂缝圆盘砂岩试样在GCTS岩石测试系统上进行劈裂加载试验,借助数字图像相关方法(digital image correlation method,DICM)和声发射(acoustic emission,AE)仪进行实时监测,根据裂尖附近测线水平位移随载荷变化趋势和声发射定位点密集区域量化确定了试样断裂过程区长度;同时,考虑Williams级数展开式高阶项,基于修正的最大切向应力准则,确定了断裂过程区长度的理论值;最后探讨了试样的破坏形态。结果表明:DICM确定的试样断裂过程区长度均值为9.07mm,断裂过程区长度理论均值为5.19mm,其差异源于理论计算无法完全考虑岩石的微观特性及加载方式的影响;断裂过程区孕育程度达到最大时对应的载荷更接近塑性屈服点载荷,其载荷约为峰值载荷的92.19%~95.47%范围;声发射信号能够体现试样裂尖微裂纹随载荷孕育和发展过程,声发射定位点确定的试样断裂过程区长度与DICM有较好的一致性。有助于深入理解岩石断裂过程区的孕育规律。 In order to study the inoculation law and acoustic emission characteristics of rock fracture process zones,straight-crack disc sandstone samples were used for the split loading test on the GCTS rock test system,the real-time monitoring was performed with the help of digital image correlation method(DICM) and acoustic emission(AE) instrument,and the lengths of sample fracture process zones were obtained according to the change of the horizontal displacement of measuring lines near crack tips and the AE event locations. The theoretical value of the fracture process zone length was determined based on the high-order term of Williams series expansion as well as the revised maximum tangential stress criterion,and the failure morphology of the specimens was discussed. The results show that the average values of the fracture process zone length determined by DICM and theoretical calculation are respectively 9.07 mm and 5.19 mm,and the difference between them is due to that the theory method fails to consider the influence of the microscopic characteristics of the rock and the loading method. The load corresponding to the maximal incubation degree in the fracture process is very closer to the plastic yield point load,about 92.19%–95.47% of the peak load. The inoculation and development process of the micro-cracks of the specimen crack tips during loading is reflected by the acoustic emission signals,and the length of the specimen fracture process zone determined by the acoustic emission positioning point has good consistency with DICM. The research work is helpful to understand in depth the inoculation law of rock fracture process zones.
作者 安定超 张盛 张旭龙 喻炳鑫 王宏越 AN Dingchao;ZHANG Sheng;ZHANG Xulong;YU Bingxin;WANG Hongyue(College of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China;The Collaborative Innovation Center of Coal Safety Production of Henan Province Jiaozuo,Henan 454000,China)
出处 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2021年第2期290-301,共12页 Chinese Journal of Rock Mechanics and Engineering
基金 国家自然科学基金面上项目(51674101) 河南省重点实验室开放基金项目(S201605)。
关键词 岩石力学 断裂过程区长度 数字图像相关方法 声发射 孕育 破坏形态 rock mechanics length of fracture process zone digital image correlation method acoustic emission inoculation failure mode
  • 相关文献

参考文献13

二级参考文献152

共引文献284

同被引文献182

引证文献14

二级引证文献44

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部