顺层岩质边坡软弱结构面加锚索剪切特性研究

Study on Shearing Properties of Soft Structure Plane With Anchor Reinforcement in Bedding Rock Slope

采用数值模拟的方法建立三维模型,探讨在加预应力锚索情况下软弱面的剪切特性。通过改变锚索单元的参数,讨论软弱面变形特性以及剪切强度的变化规律。研究表明:在加预应力锚索后软弱面的剪切强度有所提高,并且加预应力锚索主要影响软弱面的粘聚力,而对内摩擦角的影响不大;当锚索倾角增大时,软弱面的粘聚力先增大而后减小。预应力锚索长度增加会导致软弱面粘聚力增大,但是存在一临界锚索长,当预应力锚索长大于此临界长度后,预应力锚索长对软弱面粘聚力的影响逐渐变小。在锚索无预应力情况下,软弱面的剪切应力位移曲线主要呈现出应变软化特性,在锚索有预应力情况下,则呈现出应变强化特性。

To study the shearing properties tion method with the three-dimensional model, of soft plane with anchor reinforcement by the parameters of the cable element are c the numerical simulahanged to discuss the variation law of the deformation properties and shear strength of soft plane. The research shows that the shear strength of soft plane increases after prestressed anchor reinforcement, and internal friction angle is changed less greatly than that of cohesion. With the increase of the angle of cable element in soft plane, the cohesion of the soft plane increases first and then decreases. The increase of the anchor length will lead to the increase of cohesion of soft plane, but there exists a critical anchor length. If the length of anchor is longer than the critical anchor length, the influence of prestressed anchor length on the cohesion of soft plane will decreases. Stress displacement curve mainly shows that the strain softening properties for soft plane without prestress, and the strain hardening properties for soft plane with prestress.