基于差异沉降的复合地基沉降计算方法研究

差异沉降是群桩复合地基的一个不容忽视的问题,目前复合地基沉降计算均为计算复合地基的总体沉降,而研究差异沉降的关键问题是如何得到差异沉降值.提出了用桩体沉降法计算复合地基沉降的一种方法.该方法可以计算群桩中每根桩的沉降值,进而计算群桩的差异沉降.同时根据单桩沉降计算出群桩的总体沉降,通过模型试验和数值模拟提出了桩体沉降法的两个重要参数,并给出了这两个参数(桩顶应力比和桩端应力比)的经验公式.通过与模型试验和工程实测对比分析表明,采用桩体沉降法计算的沉降量与实测数据相吻合,可以认为是工程设计的一种可靠方法.图6,表4,参8.

Study on the Computational Methods of Composite Foundation Settlement on the Basis of Differential Settlement

Differential settlement is an important technology in pile group composite foundation. The key issue is how to obtain the value of differential settlement. In order to calculate the settlement of composite foundation, the "pile settlement method" was put forward. This method calculated the settlement of each pile and the differential settlement ulteriorly. In the meantime the average settlement was calculated by single pile. Two important parameters(pile top stress ratio and pile end stress ratio) of "pile settlement method" and its experience formulas were presented by model experiment and numerical simulation. The results show that model tests and engineering case is consistent. So it is employed for engineering design.