钢管桩与砂桩多元复合地基室内模型试验

Laboratory experiment of multi-pile composite foundation of steel pipe column and sand column

通过自行研发的试验装置,对钢管桩与砂桩多元复合地基进行一系列室内模型试验,得到其工作性状:钢管桩与砂桩多元复合地基的荷载沉降曲线特征,钢管桩、砂桩和土的应力特点,桩土应力比特点,各种桩和土的荷载分担比曲线特征.研究表明:本室内静载试验模型虽然不能完全模拟现场钢管桩与砂桩多元复合地基的工作性状,但从定性上分析钢管桩与砂桩多元复合地基的工作性状是可行的.从试验结果可见:当处理粉细砂类土时,钢管桩与砂桩多元复合地基明显优于砂桩复合地基.

A set of apparatus of foundation physical model were developed and utilized to conduct model tests of multi-pile composite foundation on steel pipe column and sand columns. A number of fea- tures of multi-pile composite foundation on steel pipe column and sand columns were obtained, including the characteristics of load-settlement curve, stress of the columns, stress between columns, column-soil stress ratio, and load-sharing ratio of columns and soil. Although the laboratory tests cannot precisely describe the characteristics of multi-pile composite foundation on steel pipe column and sand columns, they reveal the mechanism of multi-pile composite foundation on steel pipe column and sand columns qualitatively. It is concluded that multi-pile composite foundation on steel pipe column and sand columns contributes more greatly than sand column composite foundation for improving the silty fine sand.