关键词: 顺层岩质边坡, 最优锚固长度, 双剪统一强度理论, 锚固角, 锚杆

Abstract: 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.

Key words: bedding rock slope, optimal anchoring length, the Twin Shear Unified Strength Theory, anchoring inclination, anchor bolt