软土水泥搅拌桩复合地基沉降特性试验研究

Settlement characteristic of composite foundation for cement mixing piles in soft soil

为了分析软土水泥搅拌桩复合地基沉降特性,通过现场载荷试验,对软土单桩和四桩水泥搅拌桩复合地基沉降特性进行试验研究。试验结果表明:对于不同的荷载等级,单桩和四桩水泥搅拌桩复合地基沉降可分为快速沉降和缓慢沉降2个阶段;在快速沉降阶段,沉降量可达到本级荷载下复合地基沉降量的90%左右,而在缓慢沉降阶段,沉降量只占本级荷载下的10%;在不同荷载水平下,单桩沉降量比与时间的关系和四桩复合地基的沉降量比与时间的关系相似;其复合地基沉降量与时间的关系可以用Hill模型进行描述。

In order to analyze the settlement characteristic of composite foundation for cement mixing piles in soft soil, the settlement characteristics of composite foundation for single and four cement mixing piles in soft soil were analyzed by loading. The test results show that the settlement of composite foundation for single and four cement mixing piles, under different loads, includes two stages, i.e., quick settlement and slow settlement. At the stage of the quick settlement, composite foundation settles fast. 90% of the total settlement for the loading takes place during the quick settlement, and the remaining 10% of the settlement occurs during the slow settlement. In different load stages but in the same period, the relation of settlement ratio and time of composite foundation for single and four cement mixing piles is similar. The relationship between settlement and time can be described by Hill model.