摘要
在MTS815 Flex Test GT岩石力学试验系统上,对砂岩进行单轴压缩和三轴循环加卸载试验。结果表明,砂岩的侧向变形和体积变形都与岩石破坏有密不可分的关系;岩石微裂纹的压缩和释放并不一致,内凹现象和推进效应是岩石内部微裂纹压密、闭合、扩展等引起的;在循环加卸载持续作用下,岩石的破坏是一个累积的过程;滞回环面积受到围压、荷载大小和加载次数的影响;轴向和侧向累计不可逆应变在循环荷载作用下的增长趋势呈线性关系,围压的增大可有效限制岩石侧向累计不可逆应变。
The uniaxial compression and triaxial cyclic loading and unloading tests of sandstone are carried out on MTS815 Flex Test GT rock mechanics test system.The results show that,(a)the lateral deformation and volume deformation of sandstone are closely related to rock failure;(b)the compression and release of micro-cracks in rock are not consistent,and the concave phenomenon and propulsion effect are caused by the compaction,closure and propagation of micro-cracks in the rock;(c)the failure of rock is a cumulative process under cyclic loading and unloading;(d)the area of hysteresis loop is subjected to confining pressure,load magnitude and loading times;and(e)the increasing trend of axial and lateral accumulative irreversible strain under cyclic load is linear,and the increase of confining pressure can effectively limit the lateral cumulative irreversible strain in rock.
作者
蔡国军
冯伟强
赵大安
周扬
陈世豪
程宇航
仲闯
CAI Guojun;FENG Weiqiang;ZHAO Daan;ZHOU Yang;CHEN Shihao;CHENG Yuhang;ZHONG Chuang(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu 610059,Sichuan,China;National Geological Engineering Experimental Teaching Demonstration Center of Chengdu University of Technology,Chengdu 610059,Sichuan,China)
出处
《水力发电》
北大核心
2019年第10期44-48,74,共6页
Water Power
基金
国家自然科学青年基金资助项目(41202209)
四川省重点研发项目(18ZDYF3431)
关键词
损伤力学
砂岩
单轴压缩
三轴循环荷载
滞回环面积
累计不可逆应变
damage mechanics
sandstone
uniaxial compression
triaxial cyclic load
area of hysteresis loop
cumulative irreversible strain
