摘要
不同接触位置对规则锯齿节理面的剪切特性存在一定影响,为探究其影响规律,制作了具有相同粗糙度但接触位置不同(平直部分集中分布于节理面中部或对称分布于节理面两侧)的规则锯齿节理面,在不同起伏角、不同竖向应力条件下开展直剪试验。试验结果表明,节理面的剪切应力-剪切位移曲线可划分为4个阶段:峰前线弹性阶段、峰前非线性阶段、峰后软化阶段、峰后残余阶段。线弹性阶段节理面的剪切刚度、破坏时峰值剪切强度与锯齿的起伏角、节理面所受竖向应力以及节理面接触位置均有关;但残余剪切强度只与节理面所承受的竖向应力有关,符合摩擦作用的规律。
Different contact positions have certain influence on shear characteristics of the regular dentate joint surface.In order to explore its influence law,regular dentate joint surfaces with the same roughness but different contact positions were made(the flat part is concentrates in the middle or symmetrically distributed on both sides of the joint surface),and direct shear tests were carried out under different undulation angles and different normal stress conditions.The test results show that the shear stress-shear displacement curve of the joint surface can be divided into four stages:pre-peak linear elastic stage,pre-peak nonlinear stage,post-peak softening stage,and post-peak residual stage.In the linear elastic stage,the shear stiffness and the peak shear strength at failure of the joint surface are related to the undulating angle of the dentate,normal stress on the joint surface and the contact position of the joint surface;but the residual shear strength is only related to the normal stress on the joint surface,which conforms to the law of friction.
作者
靳天伟
戚承志
班力壬
王晓娇
王皓楠
JIN Tianwei;QI Chengzhi;BAN Liren;WANG Xiaojiao;WANG Haonan(Beijing Advanced Innovation Center for Future Urban Design,Beijing International Cooperation Base for Municipal)
出处
《北京建筑大学学报》
2021年第2期15-23,共9页
Journal of Beijing University of Civil Engineering and Architecture
基金
国家自然科学基金项目(51478027)
长江学者和创新团队发展计划项目(IRT_17R06)。
关键词
规则锯齿节理面
接触位置
剪切刚度
峰值剪切强度
残余剪切强度
regular dentate joints
contact position
shear stiffness
peak shear strength
residual shear strength
