北京交通大学学报2011，Vol.35Issue(4)：78-82,5.
岩石孔洞试件变形破坏的电测法实验
Electrometric experimental study on the deformation and failure of the rock with borehole
摘要
Abstract
"Breakout or spalling" often occurs at the excavation damage zone of hardrock underground chamber, which controls the stability of rock body. Experiment of circular borehole sample of siltstone in bidirectional unequal pressure loading is conducted, and strain gauge is adopted to monitor the deformation, then the "breakout and spalling" formation, evolution, and further destruction form are investigated. By experimental studying the stress evolution curves of the observation point on the borehole specimen surface, the mechanism of "breakout or spalling" is analyzed. It showed that the brittle hardrock borehole wall is not easy to damage in bidirectional unequal pressure loading, but when the loading reach a particular level, the borehole wall begin to damage suddenly and the breakout-"V" form develop rapidly. It is found that shear failure is near the borehole wall, while compression-shear mixed failure is deep inside the borehole wall.关键词
脆性硬岩/电测法/开挖损伤区/破坏机理Key words
brittle hard rock/ strain gauges/excavation damage zone/ failure mechanism分类
交通工程引用本文复制引用
李英杰,潘一山,张顶立..岩石孔洞试件变形破坏的电测法实验[J].北京交通大学学报,2011,35(4):78-82,5.基金项目
国家“973”计划项目资助(2010CB226803) （2010CB226803）
铁道部科技研究开发计划项目资助(2009G005-B) （2009G005-B）
辽宁工程技术大学优秀青年基金资助项目(2008) （2008）
