为了探讨结构面在加桩情况下的剪切特性,采用数值计算方法建立三维结构面与桩单元模型。改变桩单元参数,探讨结构面剪切强度和变形特征的变化。研究结果表明:结构面加桩后剪切强度提高,并且加桩效应主要改变结构面的黏结力,而对内摩擦角的影响较小;随着桩倾角的增大,黏结力呈现先增大后减小的趋势:对于无桩情况,结构面剪应力一位移曲线表现为应变软化特征,而对于加桩情况,则表现为应变强化特征。桩长度增加导致结构面黏结力不断增大,但存在一临界桩长,当桩长超过该临界桩长后,桩长的影响逐渐减小。
In order to study the shear characteristic of structure plane with pile reinforcement, the three dimensional models for structure plane and pile element were founded by the numerical calculation method. The parameters of the pile were changed to study the variation of the shear strength and deformation characteristic of structure plane. The results show that the shear strength of the structure plane after pile reinforcement increases, and cohesion is changed more greatly than that of internal friction angle. With the increase of the inclination of pile element, the cohesion first increases and then decreases. Shear stress and shear displacement shows the strain soften characteristic for structure plane without pile, and strain harden characteristic for structure plane with pile. The increase of the pile length leads to the increase of cohesion of structure plane, and there exists a limit pile length, if the length of pile is larger than limit pile length, and the effect of pile length on the cohesion of structure plane beeomes small