复合地基力学性状分析及变刚度可行性研究

Study on mechanics properties of composite foundation and project plan of variation rigidity composite foundation

通过中国矿业大学城市地下工程相似模拟试验系统,完成了2组模型试验。试验表明,在竖向荷载作用下,等桩长群桩复合地基存在着较大的差异沉降。在模型试验和数值模拟的基础上,分析了复合地基在竖向荷载作用下的力学性状,对采用改变桩长、桩径、桩体模量等方法实现变刚度复合地基的方案进行了研究。

Two model experiments are conducted with analog simulation experiment system of urban underground engineering in China University of Mining ＆ Technology, Beijing Campus. The experiment results reveal that differential settlement occurs in the equal length composite foundation under vertical load. The mechanics properties of composite foundation are dealt with by model test and numerical simulation results in this paper. In the meantime, project plans of changing length, diameter and modulus of pile of variation rigidity composite foundation are analyzed and discussed.