摘要
交通荷载长期作用下,软土地基的稳定性会受到很大影响;作为持力层的砂土也会因此受到影响。利用空心扭剪仪模拟交通荷载条件下主应力轴旋转角变化对砂土强度的影响进行研究。为了研究砂土颗粒形状对主应力轴旋转角的响应,利用三种不同砂土颗粒(丰铺砂、玻璃微珠和Ottawa砂)在不同应力加载路径下砂土试样强度进行对比分析。研究结果表明,不同形状的砂土颗粒非共轴现象差异较大,试样的强度也出现不同;形状相同但粒径不同的玻璃微珠的应力应变曲线也存在差异。
With the influence of traffic loading in the long term,stability of soft soil s foundation would be affected;and as a holding force level,sand would be also influenced.Hollow torsional shear apparatus would be used to simulate the influence of principal stress direction on sand s strength under traffic loading condition.Further,to study the influence of particle shape on principal stress direction,three different sands(Toyoura sand,glass bead,Ottawa sand)would be used to make a strength comparison at different stress path.The results show that different shape sands show much difference at non-coaxial behavior and samples strength.For glass beads,different particle sizes make a difference at stress-strain curve.
作者
孙春光
SUN Chun-guang(China Railway SiYuan Survey and Design Group Company,Wuhan 430063,China)
出处
《科学技术与工程》
北大核心
2018年第10期255-261,共7页
Science Technology and Engineering
关键词
空心扭剪
砂性颗粒材料
主应力轴旋转角
非共轴
颗粒形状
hollow torsional shear apparatus
sand particle materials
principal stress direction
non-coaxial behavior
particle shape
