静压桩引起的超孔隙水压力及单桩极限承载力预测

PREDICTION OF EXCESS PORE WATER PRESSURE RESULTED FROM STATIC PRESSED PILE AND TIME-DEPENDENT PILE ULTIMATE BEARING CAPACITY

引入时间、深度参数 ,分析饱和软土中静压桩单桩引起的超静孔隙水压力 ,给出了超静孔隙水压力及其消散的准三维解析解。基于有效应力原理 ,从超静孔隙水压力的消散和桩周土的固结出发 ,结合桩土接触面的破坏形式 ,获得了考虑时间效应的单桩承载力的解析解 ,实现了对其任意时刻单桩承载力的预测。通过两个工程实例表明了计算方法的正确可行。

Time and depth are adopted to analyse excess pore water pressure caused by static pressed pile in soft clay, and a 3D analytical formula is achieved. Based on the effective stress principle and according to dissipation of excess pore water pressure, consolidation of the clay around the pile and failure mode of pile-soil interface, an analytical solution to predict time-dependent ultimate bearing capacity of the driven pile is obtained. Results from the presented analytical solution are in agreement with those of the site tests.