桩承加筋路堤中路堤与褥垫层共同作用理论分析

Theoretical analysis of combined action of cushion and embankment fills in pile-supported embankment

从桩承加筋路堤中加筋褥垫层与路堤填土共同作用的实际情况出发,利用弹性力学对路堤填土单元进行了力学平衡分析,同时考虑到加筋褥垫层的工作状态类似于连续梁板的特性,根据PCC桩承加筋路堤的设计参数及现场测试结果,将现浇混凝土薄壁管桩(PCC)桩承加筋路堤中的加筋褥垫层视为弹性薄板,再根据薄板小挠度理论,推导出了桩土差异沉降等计算公式。又根据填土与褥垫层变形协调、应力连续的条件,在忽略褥垫层材料本身压缩量的前提下将加筋褥垫层变形分析与填土变形分析相结合,提出了求解填土等沉面高度、桩土应力、桩土差异沉降的方法,最后通过与现场实测结果对比,验证了方法的正确性。

The geosynthetic-reinforced cushion in pile-supported embankment works as a beam or plate,taking the characteristic of PCC pile composite foundation into account,therefore the reinforced cushion is considered to be an elastic thin sheet for calculation;and the formula of differential settlement between pile and soil has been drawn by using the thin sheet small deflection theory.On the basis of the compatible deformation between cushion and landfill,the methods of calculating the height of uniform settlement plate in landfill and stress ration between pile and soil have been got,but the compression of cushion material has been ignored.Finally,the comparison between calculated result and measured result shows that the formulas are acceptable.This method is also adaptable for other rigid pile-supported embankment.