锯齿结构面剪切数值模拟

Shear numerical simulation of the sawtooth structure plane

为探讨锯齿结构面的力学特性,利用FLAC^(3D)建立岩体结构面的三维模型,分析结构面力学性质的影响因素.研究表明:剪切强度随起伏角的增大由线性关系演变到非线性关系,体现在结构面的破坏效应由爬坡效应逐渐演变成啃断效应,最后发展成复合破坏效应;低正应力条件下,强度较大的锯齿先受到破坏,而较高正应力条件下却不同,先受到破坏的则是强度较低的锯齿;随着加载速率的增大,峰值数目增多,峰值依次减小,且结构面残余剪应力逐渐降低.

To explore the mechanical characteristic of the sawtooth structure plane, this paper uses the 3 D model of the rock mass structure established on the basis of FLAC3D and analyzes the impact factors of the structure and mechanical characteristic of the surface. It shows that the shear strength with the increase of rolling angle evolves from the linear relationship to the non - linear relationship, which is reflected in the structure of surface damage composite effects by climbing effect gradually turn into gnawed effect, and eventually develops into a damaging effects; under low normal stress conditions, the greater the intensity of sawtooth, the first being destroyed, whereas at higher normal stress condition is different, the first sawtooth. Along with the loading rate increases, the number of peaks increases, and the residual structure surface shear stress decreases. damaged the peak is the lower intensity gradually decreases,