规则锯齿型软弱结构面剪切特性的数值分析

Numerical analysis for shear characteristic of soft structure plane with regular curved edge

为了探讨规则锯齿型软弱结构面的剪切特性,利用FLAC3D建立岩体软弱结构面的三维计算模型,分析结构面的剪切强度和变形特征.结果表明:剪切应力和剪切位移的关系从初期的线性特征转变为非线性特征;软弱结构面和岩体的耦合作用导致结构面的等效粘结力和等效内摩擦角均小于二者的平均值;迎剪切方向的结构面主要发生剪切破坏,而沿剪切方向的结构面主要发生拉伸破坏.结构面的剪切强度与剪切速率成线性关系;随着结构面厚度的增加,试样的剪切强度逐渐减小.研究得到的结果可为理论分析和工程实践提供参考.

In order to study the shear characteristic of soft structure plane with regular curved edge,a three dimensional calculation model for soft structure plane in rock mass was established with FLAC3D,and the shear strength and deformation characteristics of the structure plane were analyzed.The results show that the relationship between shear stress and shear displacement changes from initial linear characteristic into nonlinear characteristic.The coupling effect between soft structure plane and rock mass causes that the equivalent cohesion and equivalent internal friction angle of structure plane are lower than the average value of both soft structure plane and rock mass.The shear failure mainly occurs on the structure plane faced the shear direction,while the tensile failure mainly occurs on the structure plane along the shear direction.The relationship between shear strength and shear velocity of structure plane is linear.With increasing the thickness of structure plane,the shear strength of sample decreases gradually.The obtained results can provide the references for the theoretical analysis and engineering practice.