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差异沉降是群桩复合地基的一个不容忽视的问题.通过国内最新研制的大型试验台——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研究了群桩复合地基差异沉降的形成原因,主要包括不同桩位、荷载和下卧层.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分析和讨论,结果表明通过改变桩长的方法是实现变刚度的最佳选择.图7,表9,参10.
Differential settlement is a problem that can not be ignored in the pile group composite foundation.Through the newly developed large test-bed - China University of Mining and Technology similar simulation test system of urban underground engineering, completed two sets of model tests.Experiments show that: in the vertical load The results show that there are large differential settlement of the lower pile group composite foundation.On the basis of model test and numerical simulation, the formation causes of differential settlement of pile group composite foundation are studied, including different pile positions, loads and subsoil. The method of changing the length of pile, the diameter of pile and the modulus of pile is adopted to analyze and discuss the scheme of variable stiffness composite foundation. The results show that the method of changing length of pile is the best choice for variable stiffness. 10.