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结构面的存在改变了岩体力学性质,影响了岩体强度特征。基于统计岩体力学强度判据,结合摩尔-库仑准则,得到了含单组结构面岩体破坏的4种不同方式和相应的结构面倾角范围,推导了岩体强度由结构面控制转化为应力控制的临界围压表达式。在此基础上,根据岩石和结构面参数之间的关系,将含单组结构面岩体分为4类,并探讨了可能破坏方式和发生破坏的条件。最后,举例分析了含单组结构面闪长岩的强度特征,结果表明,该岩体属于第I类岩体,在垂向受压时先沿结构面后沿岩块破坏,临界围压为9.12 MPa;从全空间分析,该岩体强度各向异性显著,围压增大可使岩体在一些方向上受力时强度由结构控制转化为应力控制。
The existence of structural plane changes the mechanical properties of rock mass and affects the rock mass strength characteristics. Based on the criterion of mechanical strength of rock mass and the Mohr Coulomb criterion, four different modes of rock mass failure with single-group structural plane and the corresponding range of structural face tilt angle are obtained, and the rock mass strength is transformed from structural plane control to stress Controlled critical confining pressure expression. On this basis, according to the relationship between rock and structural plane parameters, the group of single-group structural face rock mass is divided into four categories, and the possible failure modes and conditions for failure are discussed. Finally, the strength characteristics of a single group of structural diorite are analyzed by means of an example. The results show that the rock mass belongs to the type I rock mass. When the vertical compression occurs, the rock mass is destroyed along the rock mass behind the structural surface with a critical confining pressure of 9.12 MPa. From the perspective of full-space analysis, the anisotropy of the rock mass is significant and the increase of confining pressure can transform the strength of the rock mass from structural control to stress control under stress in some directions.