盐岩巴西劈裂疲劳变形和强度特性研究  

Study of deformation and strength characteristics of Brazilian splitting fatigue tests of salt rock

作　　者：王伟超[1,2] 刘希亮[1] 苏承东[3] WANG Weichao;LIU Xiliang;SU Chengdong(School of Civil Engineering, Henan Polytechnic University,Jiaozuo 454003,China;Henan Colleges and Universities Deep Mine Construction Key Discipline Open Laboratory, Henan Polytechnic University,Jiaozuo 454003 ,China;School of Energy Science and Engineering, Henan Polytechnic University,Jiaozuo 454003 ,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454003 [2]河南理工大学河南省高等学校深部矿井建设重点学科开放实验室,河南焦作454003 [3]河南理工大学能源科学与工程学院,河南焦作454003

出　　处：《武汉大学学报（工学版）》2018年第4期305-313,共9页Engineering Journal of Wuhan University

基　　金：河南省高校基本科研业务费专项资金资助项目(编号:NSFRF140145);河南省高等学校重点科研项目(编号:15A410004);河南省高校深部矿井建设重点学科开放实验室开放基金(编号:2014KF-06)资助

摘　　要：在RMT-150B岩石力学试验机上对盐岩进行了常规巴西劈裂试验、恒荷载疲劳法和变荷载疲劳法疲劳试验，并对破坏试件断口形貌进行电镜扫描．试验结果表明：对于盐岩等较软岩或软岩，开展巴西劈裂试验时，采用平板劈裂法时常规数据处理方法造成结果偏差较大，采用钢丝劈裂法时常规数据处理后结果相对更准确；常规劈裂试验的变形特征与单轴压缩基本相似，包括压密、弹性、屈服和破坏4个阶段；恒荷载疲劳法曲线垂直变形和水平变形都包括“疏-密-疏”3个阶段；变荷载疲劳法荷载-变形曲线并不受常规劈裂过程曲线控制，破坏时的变形量甚至大于常规劈裂试验的变形量，从第2级平均荷载开始，变形量、滞回环数与平均荷载水平都呈现近似线性增长．Brazilian splitting test and splitting fatigue test were carried out with a servo-controlled test machine RMT-150B. After that, the microtest, SEM, was carried out to study the fracture surface of salt rock. The testing results indicate that for a soft rock, such as salt rocks, in Brazilian splitting test, when the conventional data processing method is adopted, the result deviation of using the tablet splitting method is larger than that of using steel wire splitting method. There are similar deformation behavior in both the eonventional splitting tests and uniaxial eompression tests. The stress-strain curves include 4 stages, i. e. compaction, elasticity, yielding and failure stages. Both the vertical deformation and horizontal deformation of splitting fatigue tests under constant average loading can be divided into ＂loosening-tightness-loos- ening＂ three stages. The destroy modes of splitting fatigue tests under the variational average loading are not controlled by the fracturing process curve of the conventional splitting tests. The deformation extent of fatigue tests under variational average loading is even greater than that of conventional splitting test. Starting from the second average loading, deformation, hysteresis loop and average loading levels are approximate linear growth.

关 键 词：盐岩 岩石力学 巴西劈裂 抗拉强度 

分 类 号：TU45[建筑科学—岩土工程]