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花岗岩在不同应力状态下力学响应特性的试验研究
Study on Mechanical Response of Granite under Different Stress Conditions
【Author】 Yu Shui-sheng,LuYu-bin,Cai Yong (Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)
【机构】 西南科技大学制造过程测试技术教育部重点实验室;
【摘要】 采用MTS815 Flex Test GT岩石力学试验系统对花岗岩进行了劈裂、单轴和三轴压缩试验以研究花岗岩在不同应力状态下的力学响应特性。结果表明,抗压强度随着围压的增加而增大,但强度的增加幅度随围压的增加有减小的趋势;轴向破坏应变随着围压的增加也呈增大的趋势,变形破坏除了与其组分和结构有关外,还与所处的应力状态密切相关;随着围压的增加,试样的束缚更加紧密,经历弹性段时应变值变小,弹性模量相应地增大;另外,三轴压缩条件下花岗岩发生剪切滑移破坏。
【Abstract】 Splitting,uniaxial and triaxial compression Test were used to study on the mechanical response characteristic of the granite under different stress conditions,with the MTS815 Flex Text GT rock mechanics text system.The test results show that Compressive strength increases with increasing confining pressure,but the intensity increasing range with the increase of confining pressure has a tendency to decrease.Axial failure strain showed a trend of increasing with the increase of confining pressure,the deformation and failure in addition to related to its composition and structure,also is closely related to the stress state,With the increase of confining pressure,the sample ties more closely,through the elastic strain value is smaller,the elastic modulus increases accordingly.In addition,granite happens shear slip failure under the condition of triaxial compression.
【Key words】 rock mechanics; confining pressure; splitting test; uniaxial compression test; triaxial compression test;
- 【会议录名称】 第五届全国强动载效应及防护学术会议暨复杂介质/结构的动态力学行为创新研究群体学术研讨会论文集
- 【会议名称】第五届全国强动载效应及防护学术会议暨复杂介质/结构的动态力学行为创新研究群体学术研讨会
- 【会议时间】2013-07-01
- 【会议地点】中国内蒙古呼和浩特
- 【分类号】TU458.3
- 【主办单位】中国力学学会爆炸力学专业委员会、中国兵工学会爆炸与安全技术专业委员会