摘要
土拱效应是保证抗滑桩桩后土体稳定的重要因素,由于岩土体具有蠕变特性,必然导致桩间土拱的形成具有一定的时效性。笔者设计了抗滑桩室内推桩模型试验,分析了1 kN、2 kN恒定外推力条件下,抗滑桩桩后土体内部的应力分布特征及土拱效应的时效性。沿法向布置的土压力计量测数据表明,土拱效应随着推力的增大而增强。随着时间的推移,土拱作用厚度相对增加;沿推力方向布置的土压力计量测数据表明,水平土拱效应伴随推力增长呈现出先增强而后逐渐扩展的现象,随着时间的增长,应力沿着法向扩散的范围有很大的增长。
Soil arching effect is important for stabilizing the soil behind anti-sliding pile.The creep of soil mass will inevitably lead to the formation of soil arching,which has time effect.In this analysis,an indoor thrust-pile model test is proposed.The characteristics of stress distribution in the soil and the time effect of soil arching behind anti-sliding pile are analyzed.The experimental data acquired by the soil pressure cells arranged along the normal direction of the thrust show that soil arching effect is enhanced with the increase of thrust.The thickness of soil arch increases with time.And the data obtained by soil pressure cells arranged along the direction of the thrust show that the horizontal soil arching effect increases and then gradually extends.The scope of stress dispersion has very large growth along the normal direction as time goes on.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第2期28-31,共4页
Journal of Civil,Architectural & Environment Engineering
基金
中央高校基本科研业务费(CDJZR10200005)资助
关键词
抗滑桩
恒定外推力
土拱效应
时效性
土压力
蠕变
anti-sliding pile
constant loading
soil arch
time effects
soil pressure
creep
