基于Barton-Bandis准则的锚固边坡稳定性分析

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。

Stability analysis of anchored rock slope based on Barton-Bandis failure criterion

Based on the Barton-Bandis failure criterion, this paper explores two common methods on converting the nonlinear strength parameters of Barton-Bandis failure criterion into the linear shear strength parameters c, φ of Mohr-Coulomb failure criterion, and discusses their advantages and disadvantages by case study. Following this idea, the anti-sliding stability factor was deduced for such a plane slide rock slope, which was reinforced by prestressed anchor cable and controlled by single rock joint. Next, the analysis of parameters on anchoring was conducted. Parametric analysis shows that, studying the anti-sliding stability factor of plane slide rock slope by Barton-Bandis failure criterion is intuitive and effective, in comparison with obtaining the Mohr-Coulomb shear strength parameters with the equivalent linear fitting or tangent equivalent method. Meanwhile, the slope safety factor increases significantly with the increase of three factors, namely, the basic friction angle, the surface roughness coefficient and the effective compressive strength. Also, the influence of the basic friction angle and the roughness coefficient on the slope safety factor is more pronounced. It is also shown that the larger the tension force of anchor cable is, the better the slope sliding stability will be, whilst, the value of the set angle of anchor cable exerts a negative role on the slope sliding stability; therefore, the improper dip angle of anchor cables will significantly reduces the anchorage effect.