考虑施工顺序及遮栏效应的静压群桩挤土位移场研究

基于应变路径法及源汇法理论,建立了已存在桩情况下单桩挤土位移场。在此基础上,结合拉格朗日插值函数推导出了考虑施工顺序及遮栏效应的群桩挤土位移场的解析解。该解较各桩的简单叠加更符合工程实际情况,而且能够简化为不考虑施工顺序的静压群桩挤土位移场的解答。利用得到的解析解对群桩产生的挤土位移场进行了分析,结果表明:与忽略施工顺序及遮栏效应的群桩挤土位移场相比,考虑施工顺序及遮栏效应的迎桩面挤土位移较大,而背桩面的挤土位移较小。

Soil displacements around jacked group piles based on construction sequence and compacting effects

According to the strain path method and source-sink method,the closed-form analytical expressions of displacement fields due to the presence of adjacent piles were obtained.Based on the analytical expressions of singe pile and Lagrange interpolating function,the closed-form analytical expressions of displacement fields of soil around jacked group piles were derived.The solution taking into consideration construction sequence and compacting effects was in accordance with the practical engineering.And the solution could be reduced to simplified solution without consideration of construction sequence and compacting effects.Displacement fields of soil around group piles were analyzed by the solution.It was shown that the displacement of frontal surface was larger and that of dorsal surface was smaller with consideration of construction sequence and compacting effects.