摘要
针对水电站时滞性岩爆以及滞后开挖的围岩塌方灾害现象,选取锦屏水电站大理岩为研究对象,运用THMC多功能耦合试验机进行了单轴压缩和常规三轴压缩试验,研究大理岩在外界荷载作用下的力学特性和破坏机理。试验结果表明,(1)随着围压的增加,大理岩的脆性逐渐减弱延性逐渐增强,即大理岩的塑性变形逐渐增加。(2)在常规三轴压缩试验中,岩样的破坏是由内摩擦角φ升高和黏聚力c的减少共同实现的。(3)从常规三轴压缩试验大理岩的破坏形态的角度探讨了不同围压级别对大理岩力学特性的劣化影响机制。
The delayed rock burst in the tunnel excavation of hydropower station and the delayed collapse hazards of surrounding rock mass after the excavation were laboratory studied using conventional triaxial compression test equipment on marble rock samples form Pingjing Hydropower Station construction site.The marble of Jinping Hydropower Station is selected as the research object.Uni-axial compression and conventional triaxial compression tests of marble were carried out by using THMC multifunctional coupling testing machine.The mechanical properties and failure mechanism of marble under external load are studied.The test results show that,1.With the increase of confining pressure,the brittleness of marble decreases and the ductile increases gradually,that is to say,the plastic deformation of marble increases gradually.2.the failure of rock samples in conventional triaxial compression tests is achieved by the increaseφinternal friction angle and the decrease of cohesion c.3.The influence mechanism of different confining pressure on the mechanical properties of marble is discussed from the angle of the failure mode of the conventional three-axis compression test marble.
作者
董正东
田浩源
DONG Zhengdong;TIAN Haoyuan(School of Civil and Environmental Engineering,Hubei University of Technology,Wuhan 430068)
出处
《土工基础》
2021年第5期635-639,共5页
Soil Engineering and Foundation
关键词
常规三轴压缩
大理岩
塑性变形
脆性破坏
延性破坏
破坏形态
conventional triaxial compression tests
marble rock samples
plastic deformation
brittle failure
ductile failure
failure mode
