路堤下桩承式加筋复合地基的桩土应力比  

Pile-soil Stress Ratio of GRPS Composite Foundation under Embankment

作　　者：赵明华[1] 胡增[1] 陈炳初[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《公路交通科技》2012年第10期33-37,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51078138)

摘　　要：由于路堤荷载下桩承式加筋复合地基的桩体与桩间土之间变形的不协调,引起路堤内部一定高度范围内填土发生相对位移、应力产生重分布。通过对上部路堤填土的受力变形分析,采用极限平衡理论,得到了桩承式加筋复合地基加筋垫层上表面土压力的计算公式。以水平加筋垫层为研究对象,在假定其下凹变形为旋转抛物面的基础上,基于弹性理论,由静力平衡和变形协调条件,考虑桩间土的支撑作用,推导了路堤下桩承式加筋复合地基桩土应力比的计算方法。最后采用该方法对某一现场试验结果进行了验证,理论值与实测值吻合较好,表明了文中计算方法的可行性。Because of geosynthetic-reinforced and pile-supported （GRPS） composite foundation under embankment load, the settlements of piles and soil between piles are uncoordinated, which lead to vertical relative displacement and stress redistribution in certain height of filled soil. Through analysing the mechanical behavior and deformation of the upper embankment fill, the expression of the earth pressure acting on reinforced cushion was derived by using the limit equilibrium theory. Taken horizontal reinforced cushion as the research object, assumed that its concave deformation was a paraboloid of revolution, based on the theory of elasticity, considered the static equilibrium and the compatibility of deformation as well as the supporting effect of soil between piles under the geogrid, the calculation method of the pile-soil stress ratio of GRPS composite foundation under embankment was derived. Finally, an in-situ test result was analysed by the proposed method, it shows that the calculation value is close to the measured one, which verified the feasibility of the proposed calculation method.

关 键 词：道路工程 桩土应力比 弹性理论 桩承式加筋复合地基 旋转抛物面 

分 类 号：U416.12[交通运输工程—道路与铁道工程]