深厚土石填方体基桩负摩阻力的原位试验研究

In situ experimental study on negative skin friction of piles in deep earth rock fill

土石混合料填方体在固结沉降期间激发了桩侧负摩擦力,引起基桩下拉荷载,将会造成桩端地基的屈服或破坏。为了系统的探索土石混合料中基桩负摩阻力的发挥机制,在贵州某深厚土石混填方工程中选定几根基桩进行负摩阻力、桩周土沉降的长期原位试验监测,研究桩周土沉降与基桩负摩阻力的关联性,为类似土石混合料高填方工程中的基桩设计提供一定的数据参考。

During the consolidation and settlement of soil-rock mixtu re fill,the negative friction at the pile side is excited,which causes the pull-down load of the foundation pile,and will cause the yield or damage of the pile-end foundation.In order to systematically explore the mechanism of negative skin friction of foundation piles in soil-rock mixture,several foundation piles are selected in a deep earth rock mixture fill project in Guizhou Province for long-term in-situ test monitoring of negative skin friction and settlement of soil around the pile,the correlation between settlement of soil around the pile and negative sk in friction of foundation pile is studied,which will provide a certain data reference for the design of foundation piles in similar earth-rock mixture high fill projects.