摘要
软弱夹层作为一种力学性质比较特殊的结构面,会显著影响岩体的稳定性.采用数值模拟方法研究了不同粗糙度和不同法向应力对含软弱夹层岩体试样的强度和变形的影响,并从微观角度分析了试样的起裂特征、裂纹扩展途径.结果表明:①试样的峰值强度和残余强度均随着结构面粗糙度和法向应力的增加而增加.②当试样发生剪切破坏时,产生的裂纹以张裂纹为主,且裂纹起裂位置主要集中在软弱夹层和结构面相交处.③粗糙度越大,试样的破坏程度就越大;法向应力越大,对试样的破坏作用就越明显.
As a structural plane with special mechanical properties,the weak interlayer will significantly affect the stability of the rock mass.The effects of different roughness and different normal stresses on the strength and deformation of rock mass samples with weak interlayer were studied by numerical simulation method,and the crack initiation characteristics and crack propagation of the samples were analyzed from microscopic view.The results are as follows.①Both the peak strength and residual strength of the specimens increase with the increase of structural plane roughness and normal stress.②When shear failure occurs in the sample,the cracks are mainly tensile cracks,and the crack initiation position is mainly concentrated at the intersection of the weak interlayer and the structural plane.③When the roughness increases,the damage of sample becomes greater.When the normal stress increases,the damage to the specimen becomes more obvious.
作者
顾问
丁伟
施威
王金
GU Wen;DING Wei;SHI Wei;WANG Jin(The 1st Geological Brigade of Jiangsu Geology and Exploration Bureau,Nanjing 210041,China;School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China)
出处
《河南科学》
2022年第8期1229-1236,共8页
Henan Science
基金
国家自然科学基金项目(42007256)
中国博士后科学基金(2021M690865)
中央高校基本科研业务费助研项目(B210201002)
江苏省地质工程环境智能监控工程研究中心开放基金(2021-ZNJKJJ-04)。
关键词
软弱夹层
数值模拟
直剪试验
破坏机理
残余强度
weak interlayer
numerical simulation
direct shear test
failure mechanism
residual strength
