不同卸围压速率对岩石破坏过程能量演化的影响研究  

Influence of different unloading confining pressure rates on energy evolution of rock failure process

作　　者：郑清达 李进国 纪伟杰 赵相东 王在泉[1] ZHENG Qing-da;LI Jin-guo;JI Wei-jie;ZHAO Xiang-dong;WANG Zai-quan(School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;Qingdao Haichuan Construction Group Co., Ltd.,Qingdao 266033, China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033 [2]青岛海川建设集团有限公司,青岛266033

出　　处：《青岛理工大学学报》2017年第6期8-12,26,共6页Journal of Qingdao University of Technology

基　　金：国家自然科学基金资助项目(41372298)

摘　　要：为探究不同试验能量转化与释放的差异,研究卸围压速率对能量转化与释放的影响,对常规三轴试验和恒轴压卸围压试验结果进行能量分析.结论表明:总能量受卸荷速率的影响较小;弹性应变能随卸荷速率的增大先降后升,影响岩石的储能极限;卸荷速率越大,弹性应变能释放越缓慢,耗散应变能越小,岩石裂纹扩展需要消耗的能量越少.By exploring the differences of energy conversion and release,and studying the influence of unloading rate on energy,this paper carries on an energy analysis based on the results of the conventional triaxial tests and the constant axial stress and unloading confining pressure tests.The analysis shows that the total energy is less affected by unloading rate.The elastic strain energy with the increase of unloading rate rises after the first drop and affects rock storage limit.The faster the unloading rate gets,the slower the elastic strain energy is released;the smaller the dissipation of the strain energy turns,and the less energy the rock crack growth consumes.

关 键 词：卸荷速率 能量分析 大理岩 恒轴压 卸围压 

分 类 号：TU452[建筑科学—岩土工程]