三剪强度准则及其在巷道围岩弹塑性分析中的应用  

New tri-shear failure criterion and its application in elasto-plastic analysis for the wall rock of tunnel

作　　者：胡小荣[1] 俞茂宏[1] 

机构地区：[1]西安交通大学土木工程系,陕西西安710049

出　　处：《煤炭学报》2003年第4期389-393,共5页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(59779028)

摘　　要：基于12面体单元主剪面上的3个主剪应力及正应力均会对岩石的强度和破坏产生影响,在双剪强度准则的基础上提出了一个新的三剪强度准则,并对其进行了分析.研究表明,强度准则能较全面地反映岩石的基本强度特征.另外,还应用该新强度准则对静水压力条件下的圆形巷道围岩进行了弹塑性分析.分析表明,与采用Mohr-Coulomb强度准则的结果相比,巷道轴向应力和强度理论中的参数b对巷道围岩塑性区半径、应力分布及径向位移等均有影响.On the prerequisite that the three couples of stress acting on the principal shear surfaces of the dodacahedron element have influences on the rock strength and failure, so a new trishear failure criterion is proposed on the basis of the twinshear strength theory by Yu Maohong and is verified with the published experimental facts. The research work shows that this criterion could deliberate the basic aspects of the rock strength well. In addition to that, the elastoplastic analysis using the criterion is also devoted to the wall rock of tunnel with circular crosssection under static hydraulic pressure condition. The results show that the axial stress along the tunnel and the parameter b in the criterion have some effects on the radius of plastic zone, the magnitudes of the stresses and displacement of the wall rock beyond the tunnel, comparing with that of MohrCoulomb theory.

关 键 词：岩石强度 三剪强度准则 巷道围岩 弹塑性分析 

分 类 号：TU459[建筑科学—岩土工程]