基于双剪统一强度理论的岩质边坡最优锚固长度

目前对锚杆锚固长度的研究多基于传统摩尔库伦抗剪强度理论，忽略了中间主应力的影响。鉴于此，采用双剪统一强度理论，基于顺层岩质边坡模型建立不同岩层倾角条件下锚杆的最优锚固长度与锚固角模型。提出了最优锚固长度和锚固角的确定方法，并分析了锚固角和岩层倾角对最优锚固长度的影响。提出锚固界限角确定方法，当锚固角小于该界限角时，最优锚固长度随岩层倾角的增加而减小；当锚固角大于该界限角时，最优锚固长度随岩层倾角的增加而增大；最优锚固长度随锚固角的增加先下降后上升。将所提出的方法应用到某边坡，计算结果表明，利用提出的模型计算得到的锚固长度相比规范法减少约17.9%。

Optimal anchoring length of bedding rock slope based on Twin Shear Unified Strength Theory

Currently, Mohr-Coulomb strength theory is widely used in the study of anchoring length, however the effect of intermediate principal stress is not considered. Based on a model of bedding rock slope, the Twin Shear Unified Strength Theory was employed to develop the model of the optimal anchoring length and anchoring inclination. And a method for determining optimal anchoring length and anchoring angle was given. Furthermore, the relationship between anchoring angle, strata inclination and optimal anchoring length was analyzed. We present a conception of critical angle, and its determining method was given. The optimal anchoring length decreases with the increasing of strata inclination when the anchoring inclination is less than the critical angle. Otherwise, the optimal anchoring length increases with the increase of the strata inclination. In the end, the presented method was applied to a slope study in Chongqing. The result indicates that the total anchoring length calculated by the presented method is approximately 17.9% less than that calculated by specification.