摘要
在以往单试件法基础上,结合岩石三轴压缩试验残余阶段的变形特点,研究提出了一种单试件重复加载法,测定岩石残余阶段的强度指标。研究结果表明:(1)常规多试件三轴压缩试验和单试件重复加载试验结果对比分析发现,岩样的残余强度主要由加载时的围压控制,与初始加载破坏的围压关系不明显;(2)单试件重复加载法得到的岩样残余阶段的强度指标与常规三轴压缩试验得到的结果基本一致,而且试验结果离散性明显较小,说明该方法是合理可行的;(3)为了更好地运用本文所提出的单试件重复加载法,建议在重复加载时尽量选择较大的围压值,从而保证重复加载过程中岩样的剪切破坏面处于紧密的接触状态,以更好地反映岩样在残余阶段的强度特征。
Based on the single test method and the deformation characteristics of residual phase of rock,a single specimen repeated loading method is proposed to measure the residual strength parameters of the rock.The results show that:(1) By comparing the results of the conventional triaxial tests with those of the single specimen repeated loading tests,the residual strength of rock samples is mainly controlled by the confining pressure of loading,and it is not obviously related with the initial confining pressure;(2) The strength parameters of the residual phase of rock samples obtained by the single specimen repeated loading method are basically consistent with those of the conventional triaxial tests,and the dispersion of the test results is significantly smaller,indicating that the proposed method is reasonable and feasible;(3) In order to better use the proposed single specimen repeated loading method,it is recommended to choose the larger confining pressure during the repeated loading process so as to ensure the shear failure surface of rock samples to be in close contact state,which can reflect the strength characteristics of rock samples in residual phase better.
作者
邓华锋
张恒宾
李建林
段玲玲
支永艳
潘登
DENG Hua-feng;ZHANG Heng-bin;LI Jian-lin;DUAN Ling-ling;ZHI Yong-yan;PAN Deng(Key Laboratory of Geological Hazards in Three Gorges Reservoir Area (China Three Gorges University),Ministry of Education,Hubei Province,Yiehang 443002,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2019年第2期348-354,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51679127
51439003)
湖北省技术创新专项重大项目(2017ACA189)
三峡库区地质灾害教育部重点实验室(三峡大学)开放基金项目(2015KDZ04)
三峡大学2015级硕士学位论文培优基金项目(2017YPY018)
关键词
单试件法
重复加载
残余强度
离散性
single specimen method
repeated loading
residual strength
dispersion
