Calculation and model test for pile-soil stress ratio of gravel pile composite foundation under embankment load
Calculation and model test for pile-soil stress ratio of gravel pile composite foundation under embankment load
复制标题
DOI：
--
复制
发表时间：
2009
影响因子：
1.5
通讯作者：
Yang Ming-hui
中科院分区：
文献类型：
--
作者：
Yang Ming-hui
深入分析了碎石桩复合地基在路堤荷载作用下的工作机理，对路堤-桩-土体系进行了适当简化，建立了桩土应力比计算模型；采用最小势能原理推导了路堤荷载作用下的桩土应力比计算公式，与大型室内模型试验结果进行了比较，结果表明该方法能够满足工程要求。研究了影响桩土应力比的因素。结果表明，桩土应力比受桩土模比和位移比的影响较大，而路堤高度和路堤材料对桩土应力比的影响较小，桩土应力比随着路堤高度的增加而增大，达到一定值后趋于稳定，路堤填土的剪切模数增加时桩土应力比略有增加。
Working mechanism of gravl pile composite foundation under embankment loads is deeply analyzed.The system of embankment-pile-soil is simplified properly;the calculation model of pile-soil stress ratio is established;and the solving process of key parameters is given.The principle of minimum potential energy is adopted to deduce the formula of pile-soil stress ratio under embankment loads.Compared to the results which is observed in large-scale laboratory model test, the method put forward can satisfy the engineering requirement.Factors influencing the stress ratio are studied.The results show that the stress ratio is significantly affected by pile-soil modulus ratio and displacement ratio, while embankment height and embankment material less effect on it.The pile-soil stress ratio increases when the embankment height increases, it becomes stable when height comes to a fixed value;and it increases slightly when shear modulus of embankment fill increases.