基于持续屈服节理模型的节理直剪数值试验

发布时间：2018-04-16 12:36

本文选题：持续屈服节理模型 + 节理法向刚度　；参考：《中南大学学报(自然科学版)》2016年04期

【摘要】：根据山西平朔露天煤矿砂岩岩石及节理室内试验确定力学参数,采用块体离散元软件3DEC内置FISH语言编制程序,实现基于持续屈服节理模型的节理直剪数值试验,研究节理粗糙度、初始摩擦角和基本摩擦角差值对剪切强度的影响。研究表明:采用持续屈服节理模型的节理面数值剪切试验能反映节理剪切应力随剪切位移变化的4个阶段,即曲线上升—峰值—软化—残余应力阶段;与室内试验结果相比,持续屈服节理模型能较好地表征节理剪切峰值强度及峰值强度前剪切应力与剪切变形的非线性关系,且能较好地反映峰值强度后应变软化及残余强度等节理面力学性质;随粗糙度增大,剪切峰值强度按幂函数增大;随摩擦角差值增大,节理剪切峰值强度线性增大。
[Abstract]:According to the determination of mechanical parameters of Shanxi Pingshuo opencast mine sandstone rock and joint laboratory test, the block discrete element software 3DEC built-in FISH language program, to achieve sustainable yield joint model based on joint numerical direct shear tests, studying joint roughness, influence of initial friction angle and basic friction angle difference on shear strength. The research indicates that: 4 a stage by joint shear test numerical model can reflect the sustainable yield of joint joint shear stress with the change of shear displacement, the curve peak softening - residual stress stage; and the indoor test results compared to continuous yield model can better characterize the joint shear non-linear relation between stress and shear deformation of joint shear the peak intensity and peak intensity, and can better reflect the peak intensity after mechanical strain softening and residual strength of joint surface roughness increases with the nature, The peak shear strength increases according to the power function, and the shear peak strength of the joint increases linearly with the increase of the friction angle difference.

【作者单位】：北京科技大学土木与环境工程学院;北京矿冶研究总院;长江三峡勘测研究院有限公司;
【基金】：国家自然科学基金资助项目(51074014,51174014) 科技北京百名领军人才培养工程项目(Z151100000315014) 中国博士后科学基金资助项目(2015M570037)~~
【分类号】：TU45

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