静压桩承载力的时效性数值分析  

Numerical simulation of time effect on the bearing capacity of static pressed pile

作　　者：冯志焱[1] 任子熊 齐晋阳 马小兵[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《中国港湾建设》2015年第9期1-5,共5页China Harbour Engineering

基　　金：国家自然科学基金资助项目(51178385)

摘　　要：孔隙水压力的消散对桩基的承载变形性状有着重要的影响。文中分析了在孔隙水压力消散过程中,桩身负摩阻力、中性点、桩端阻力、桩侧阻力、桩身轴力以及桩极限承载能力的变化规律。结果表明:孔隙水压力由桩顶至桩底消散的越来越慢,且消散速率前期较后期快;桩的承载力呈双曲线增长,前期承载力增幅较大,承载力的提高主要依靠侧摩阻力的提高;中性点的位置逐步下移,侧摩阻力沿桩身大致呈S形分布;桩周土体会产生固结沉降,强度也得到提高,将对桩的承载力产生不同的影响。The dissipation of pore water pressure has an important impact on the pile bearing and deformation characteristics. We analyzed the pore water pressure during the dissipation, which has an effect on negative skin friction, neutral point, pile tip resistance, pile skin resistance, axial force as well as ultimate bearing capacity. The results show that：in the dissipation of pore water pressure, the pore water pressure dissipates more and more slowly from top pile to bottom, and the earlier pore water pressure dissipates faster than latter one;the bearing capacity of the pile is a hyperbolic growth, early, the larger increase in bearing capacity, the bearing capacity growth mainly depends on the growth of side resistance; the position of neutral point shifts down gradually, and the distribution of side friction shows S type;the soil around the pile will produce the consolidation settlement and its strength is also improved, these aspects will have different effect on the bearing capacity of the pile.

关 键 词：静压桩 时效 数值分析 中性点 承载力 

分 类 号：U655.544.1[交通运输工程—港口、海岸及近海工程] TU473.11[交通运输工程—船舶与海洋工程]