摘要
为了研究不同拉拔速率下筋土界面的摩擦特性,进行了5种不同拉拔速率、4种不同法向应力的拉拔试验并结合数字图像分析技术揭示了砂土的位移变化规律。结果表明:随着拉拔速率的增加,存在一个临界拉拔速率v=1.5 mm/min,该速率下的拉拔力最大;不同拉拔速率下的峰值拉拔位移均随着法向应力的增加而增加,且两者呈指数函数关系;界面似摩擦角以及界面似黏聚力随着拉拔速率的增加均会发生变化,而界面似黏擦角表现出先增后减再增的趋势,其最大值与最小值两者相差8.86°,但界面似黏聚力则表现出先增后减的趋势,其最大值为最小值的1.23倍;拉拔界面的颗粒随着拉拔前进的方向一起平行移动,离拉拔界面越近颗粒位移越大,离拉拔界面越远颗粒位移越小,且拉拔界面上部颗粒的位移较下部有显著的差异。
In order to study the friction characteristics of reinforced soil interface under different pull-out velocities, five different pull-out velocities and four different normal stresses were tested, and the displacement variation of sandy soil was revealed by digital image analysis technology. The experimental results show that with the increase of drawing rate, there is a critical drawing rate v=1.5 mm/min, and the drawing force is the largest at this rate. The peak drawing displacement at different drawing rates increases with the increase of normal stress, and the relationship between them is exponential function. The interface-like friction angle and interface-like cohesion will change with the increase of drawing rate, while the interface-like friction angle shows a trend of first increasing, then decreasing and then increasing, and the difference between the maximum and minimum values is 8.86°. But the interfacial cohesion first increases and then decreases, the maximum value is 1.23 times the minimum value.The particles in the drawing interface move parallel with the direction of drawing forward. The closer to the drawing interface, the larger the particle displacement is. The farther away from the drawing interface, the smaller the particle displacement is. The displacement of the upper part of the drawing interface is significantly different from that of the lower part.
作者
王家全
祁航翔
梁宁
唐毅
WANG Jia-quan;QI Hang-xiang;LIANG Ning;TANG Yi(College of Civil and Architectural Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Zhuang Autonomous Region Engineering Research Center of Geotechnical Disaster and Ecological Control,Liuzhou 545006,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2022年第4期873-881,共9页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(41962017)
广西自然科学基金项目(2022GXNSFDA035081)
广西高等学校高水平创新团队及卓越学者计划项目(桂教人才[2020]6号)
广西研究生教育创新计划项目(YCSW2021310)。
关键词
筋土界面
拉拔速率
法向应力
图像分析
reinforcement-soil interface
pull-out velocity
normal stress
image analysis
