摘要
为研究土–结构物接触面渐进破坏机制及影响因素,研制一种新型剪应力–位移传感器,并用该传感器展开红黏土与结构物接触面大型直剪试验,探讨剪切作用下接触面的应力变形响应特征及渐进破坏规律。试验结果表明:接触面沿剪切方向上峰值应力及位移的出现呈现明显的先后顺序,在剪切方向上接触面呈现渐进破坏特征。接触面上的法向应力和土体的压实度对其渐进破坏有着显著的影响。各测点剪应力峰值出现的时间差随法向应力的增大而增大,而随压实度的增大而急剧减小。接触面的渐进破坏现象在土体低压实度情况下表现更为明显。
In order to research the mechanism of and influencing factors in progressive failure of contact surfaces of soil-structure,a new stress-displacement sensor was developed and large direct shear tests on the contact surface between red clay and structure were performed. The stress and deformation of the contact surface between red clay and structure under shear were analyzed and the progressive failure mechanism of the contact surface was investigated. The test results indicate that the peak shear stress and displacement of the contact surface occur successively along the shear direction and that the contact surface fails progressively. It was also found that the normal stress on the contact surface and the compaction degree of the soil influence significantly the progressive failure. The time difference to reach the peak shear stress at measuring points along the shear direction increases with the rising of the normal stress on the contact surface,but decreases sharply with the ascending of the compaction degree of the soil. The contact surface presents more remarkable progressive failure behavior with a lower compaction degree.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2018年第3期734-742,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51678094
51509024)~~
关键词
土力学
土–结构物接触面
渐进破坏
应力–位移
直剪试验
soil mechanics
soil-structure interface： progressive failure： stress-displacement
direct shear test
