中南大学学报（自然科学版）2017，Vol.48Issue(5)：1300-1307,8.DOI:10.11817/j.issn.1672-7207.2017.05.024
不同锯齿高度对软弱结构面剪切特性的影响
Influence of dentate discontinuity height on shear properties of soft structure plane
摘要
Abstract
In order to study the shear behavior of soft structure plane in different normal stresses and dentate discontinuity heights, a series of structure plane calculation models with different dentate discontinuity height were established with numerical method and were used to simulate the direct shear test under different normal stresses. The relationship between stress and strain before and after the peak shear strength of the structural plane was discussed. A linear relationship expression between the dilatancy angle and the dentate discontinuity height was established. The results show that with the increase of the dentate discontinuity height, the peak shear displacement shows a trend of increase and the descending speed of stress in the stage of strain softening decreases at first and then increases, and reaches the minimum when the thickness of the interlayer and the dentate discontinuity height is equal. With the increase of the dentate discontinuity height, both the peak shear strength and the residual shear strength increase linearly, but when the dentate discontinuity height reaches a certain value, the residual shear strength does not change. When the dentate discontinuity height is higher such as 80 mm, the relationship between the normal stress and the shear strength of the structure plane appears to be linear. When the dentate discontinuity is at a low height, the relationship between them shows a certain nonlinear characteristics, and at this condition the shear strength of the corresponding smaller normal stress is the same. With the increase of the normal stress, the descending speed of stress in the stage of strain softening decreases continually, and the ratio of residual strength to peak strength increases at first and then decreases, and the maximum is 0.9614.关键词
锯齿高度/软弱结构面/剪切特性/残余强度Key words
dentate discontinuity height/soft structure plane/shear properties/residual strength分类
建筑与水利引用本文复制引用
唐雯钰,林杭..不同锯齿高度对软弱结构面剪切特性的影响[J].中南大学学报（自然科学版）,2017,48(5):1300-1307,8.基金项目
国家自然科学基金资助项目(51474249,51374246) （51474249,51374246）
中南大学"创新驱动计划"项目(2016CX019,2015CX005) （2016CX019,2015CX005）
深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1405) （SKLGDUEK1405）
中南大学研究生创新项目(2016zzts454) (Projects(51474249, 51374246) supported by the National Natural Science Foundation of China （2016zzts454）
Projects(2016CX019, 2015CX005) supported by the Innovation Driven Project of Central South University （2016CX019, 2015CX005）
Project(SKLGDUEK1405) supported by the State Key Laboratory Open Fund of Deep Geomechanics and Underground Engineering （SKLGDUEK1405）
Project(2016zzts454) supported by the Graduate Student Innovation Project of Central South University) （2016zzts454）
