基于法向应力突变的组合式钢管抗滑桩土拱效应模型试验研究

土拱效应是抗滑桩与土相互作用的重要现象之一。将通过法向应力突变分析抗滑桩土拱效应的新方法推广到存在桩前土的悬臂式抗滑桩;并针对此抗滑桩设计了模型试验,提供了一种新思路。试验现象表明,桩后土压力发生突变,产生了土拱效应;在一定范围内增大外荷载时,桩间土拱效应呈现出随荷载增大而增强;但在此后继续增大外荷载,土压力突变现象减弱,土拱效应减弱;在一定范围内,桩间距较小时土拱效应更明显。

Model test of combined steel anti-slide piles soil arch effect based on the mutability of normal stress

Soil arch effect is one of the important phenomenon of interaction between anti-slide piles and soil. The mutability of normal stress is considered to embedded anti-slide piles in this article, and embedded anti-slide piles model test was designed. The test result shows that the normal stress behind the steel anti-slide piles mutated and there is arch soil effect at the same time. In a certain range soil arch effect become stronger as the load increases, but after that, the mutability of normal stress and soil arch effect has begun to weaken as the load continue to increase. The soil arch effect is more obvious when the distance of piles is shorter.