基于最小差异沉降的桩筏基础优化

Piled raft foundation optimization based on minimizing differential settlements

将桩筏基础的差异沉降共同作为优化目标函数,并首次采用筏板变形后表面梯度的欧拉范数平方的积分对其进行数字化。工程算例表明以差异沉降最小为目标的"外弱内强"的布桩方式大大降低了差异沉降,改善了筏板受力,并减小了筏板的配筋量,从而使桩筏基础的造价大大降低。

An optimal pile arrangement scheme for minimizing the differential settlements of piled raft foundations is expounded.The objective fimction for the optimization is defined as the squared L2 function norm of the gradient vector of the deflected surface of the raft for circumventing difficulties in using direct definition of the maximum differential settlement.The optimization is performed with respect to the locations of the piles.The validity and effectiveness of the proposed method are demonstrated by a numerical examples.