摘要
对宜万铁路云雾山隧道灰岩进行室内三轴压缩试验研究,分析与比较了自然状态和饱和状态试样在不同围压下应力-应变关系曲线,结果表明,含水状态和围压对岩石的峰值强度、轴向应变及弹性模量均具有一定影响.在主应力空间内,利用线性莫尔-库伦强度准则拟合试验数据得到岩石的强度参数C,φ值,为该隧道工程的计算分析提供参考.对岩样的破坏特征进行分析后得出:在较低围压下,试样基本上为宏观单一断面的剪切破坏,随着围压的增大,试样有向两个相交的剪切面发展的趋势.
The surrounding rock of Yunwushan tunnel on Yiwan line is studied by triaxial compression test.The stress-strain relationships of rock sample in natural or saturated condition are analyzed and compared under different confining pressure.The testing results show that the confining pressure and water content condition have a certain influence on the peak strength,axial strain and elastic modulus.In principle stress space,the testing deat can be ideally fitted by linear Mohr-Coulomb strength criterion to obtain strength parameters C,φ,which providing a reference for related calculation and analysis of this tunnel.In addition,the failure type of rock under triaxial compression are analyzed.The results show that the failure belongs to shear failure of single break under low pressure,with the increase of confining pressure,the failure trends to two intersectional shear failure.
出处
《河南科学》
2010年第10期1274-1277,共4页
Henan Science
基金
国家自然科学基金资助项目(50978018)
关键词
三轴压缩试验
围压
含水状态
强度参数
triaxial compression test
confining pressure
water content condition
strength parameters
