论文部分内容阅读
结合岩石节理面非线性Barton-Bandis破坏准则,探讨了将Barton-Bandis破坏准则参数转化为线性Mohr-Coulomb破坏准则抗剪强度参数的两种常用方法,通过实例分析了各方法的优劣。推导了加锚单岩石节理面控制的平面滑动岩体边坡抗滑稳定性安全系数计算式,开展了锚固参数分析。研究表明:相对于采用等效线性拟合法或切线等效法获取Mohr-Coulomb抗剪强度参数而言,直接应用Barton-Bandis破坏准则计算节理面控制的岩石边坡稳定性更为直观和简便;随着结构面基本摩擦角、结构面粗糙度系数和结构面壁面有效抗压强度的增大,边坡安全系数逐步提高,且结构面基本摩擦角和粗糙度系数对边坡安全系数的影响程度更为显著;锚索锚固力越大,边坡抗滑稳定性越好,而锚索设置角度越大,边坡抗滑稳定性越低,锚索角度设置不当将明显减小锚固效应的有效性。
Combining with the nonlinear Barton-Bandis failure criterion of rock joints, two common methods of transforming Barton-Bandis failure criterion parameters into shear strength parameters of linear Mohr-Coulomb failure criterion are discussed. The advantages and disadvantages of each method are analyzed by examples. The formula to calculate the safety factor of anti-slide stability of plane sliding rock mass controlled by anchoring single rock joints is deduced, and the analysis of anchoring parameters is carried out. The results show that the stability of the rock slope controlled by the joint surface is more intuitive and simpler than directly applying the Barton-Bandis failure criterion in comparison with the equivalent linear fitting method or the tangent equivalent method for obtaining the shear strength parameters of Mohr-Coulomb. With the increase of the basic friction angle, the roughness coefficient of structural plane and the effective compressive strength of the structural plane, the safety factor of the slope gradually increases, and the influence of the basic friction angle and the roughness coefficient of the structural plane on the safety factor of the slope is more Is significant; the greater the anchorage force of the anchor cable, the better the stability of the slope is, and the larger the anchor cable setting angle is, the lower the stability of the slope is and the improper setting of the anchor cable angle will obviously reduce the effectiveness of the anchoring effect .