摘要
采用直剪仪进行重塑黄土和混凝土接触面的快剪试验.分析接触面在含水率、干密度和法向应力影响下的剪切特性,探讨接触面抗剪强度、切向刚度、黏聚力和内摩擦角的变化规律.试验结果表明:受含水率和干密度的影响,剪切应力-剪切位移关系曲线有理想弹塑性和非线性弹性-理想塑性2种类型;接触面峰值剪应力主要和含水率有关,随着含水率的减小,峰值剪应力增大;含水率增加切向刚度减小,含水率越高切向刚度变化趋势越大,并且在试样达到峰值强度时变化趋势最大;接触面切向刚度随着干密度和法向应力的增大而增大,但干密度较小时,法向应力对接触面切向刚度的影响较大;接触面内摩擦角变化较小,接触面的黏聚力、内摩擦角均小于同性质土样的黏聚力、内摩擦角.
A fast shear test was carried out using a direct shear to reshape the interface between loess and concrete.The shear properties of the contact surface under the influence of water content,dry density and normal stress were analyzed.The changes in shear strength,tangential stiffness,cohesion and internal friction angle of the contact surface were discussed.The test results showed that the shear stress-shear displacement relationship curves possessed ideal elastoplasticity and nonlinear elastic-ideal plasticity due to the influence of water content and dry density.The peak shear stress of the contact surface was mainly related to the water content.With the decrease in water content the peak shear stress increased;the increase in water content would make the tangential stiffness decrease;the higher the water content,the more change in the tangential stiffness,and the changing trend was the largest when the sample reached the peak strength;the contact surface tangential stiffness increased as the dry density and normal stress increased,and the normal stress had a greater influence on the tangential stiffness of the contact surface;the friction angle within the contact surface changed less,and the cohesive force of the contact surface and the internal friction angle were smaller than the cohesion and internal friction angle of the same soil sample.
作者
吕擎峰
潘松杰
李策策
赵彦旭
LüQing-feng;Pan Song-jie;Li Ce-ce;Zhao Yan-xu(Key Laboratory of Mechanics on Western Disaster and Environment with the Ministry of Education,Lanzhou University,Lanzhou 730000,China;China Railway 21st Bureau Group Co.Ltd.,Lanzhou 730050,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第5期601-605,614,共6页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金项目(518783221)
中铁建科技研究开发计划项目(16-C36)
关键词
接触面
剪切特性
切向刚度
黏聚力
内摩擦角
contact surface
shear property
tangential stiffness
cohesion
internal friction angle
作者简介
吕擎峰(1971-),男,甘肃会宁人,教授,博士,e-mail:lvqf@lzu.edu.cn,研究方向为岩土工程.
