沉降控制复合地基设计与测试研究

Design and test research on settlement-control of composite foundation

分析了深层搅拌桩复合地基承载特性及影响复合地基沉降变形的因素,针对具体工程,对深层搅拌桩复合地基以沉降作为控制标准进行设计,并通过桩间土应力和桩顶应力的测试,研究了复合地基桩土应力分布特性。沉降监测结果表明,该建筑物沉降量与预测值较为接近,表明在软土层较厚并且存在软弱下卧层地区,复合地基按沉降控制设计是可行的。

The bearing capacity properties and the influencing factors to building settlement control factors of the composite foundation disposed with deep-mixing pile are both analysed. In allusion to an actual project which is designed with the settlement-control criterion, the load stress distribution characteristic of composite foundation between pile and soil is also studied by the in situ tests with the pressure sensors set on pile top and nearby soil stress and the pile top stress with the settlement-control criterion. The results of the settlement monitoring show that the value of the building settlement is consistent with the predicted one, so as to prove that the settlement control design of the composite foundation is feasible in thick soft clay area or even with the area that existing the soft substratum.