基于状态空间法的桩承加筋路堤分析方法  

STATE-SPACE FORMULATION FOR GEOSYNTHETIC-REINFORCED AND PILE-SUPPORTED EMBANKMENT

作　　者：高钰[1] 王金昌[1] 鄢露秋 GAO Yu;WANG Jinchang;YAN Luqiu(Institute of Transportation Engineering,Zhejiang University,Hangzhou 310030,China;Zhejiang Communications Construction Group Co.,Ltd.,Hangzhou 310051,China)

机构地区：[1]浙江大学交通工程研究所,杭州310030 [2]浙江交工集团股份有限公司,杭州310051

出　　处：《低温建筑技术》2023年第7期132-136,共5页Low Temperature Architecture Technology

基　　金：浙江省交通运输厅项目“深厚软基处治新技术及新工艺集成研究与示范应用”(ZJXL-JTT-202201A);浙江省交通运输厅项目“复合地基路堤建养监测及全奉命评估体系研究”(202303)。

摘　　要：为快速求解桩承加筋路堤力学响应问题进而评价其路用性能,引入状态空间法,基于弹性地基梁理论将加筋垫层视作弹性地基上的欧拉直梁,建立考虑接触界面水平摩阻和非均匀刚度地基的解析模型,将位移和内力同时作为状态向量建立状态方程,求得任意竖向荷载下桩承加筋路堤解析模型的内力和变形。通过与已有文献、有限元的计算结果对比,验证了解析结果。参数分析表明,垫层厚度的变化对结构变形的影响大于垫层模量;路堤填土高度的增大使得土拱效应和拉膜效应充分发挥,但导致桩土差异沉降变大;适当增加垫层厚度,提高垫层模量可以有效地降低路堤沉降,改善桩土应力比。The state space method is used to quickly solve the mechanical response and evaluate the road perfor⁃mance of the geosynthetic-reinforced and pile-supported embankment.Based on the theory of beam resting on the elastic foundation,the reinforced cushion is simplified as a beam,and an analytical model which considering the hor⁃izontal frictional resistance and the uneven stiffness foundation is proposed.The state space equations are developed by using both the displacement and internal forces as state vectors to derive the internal forces and deformation of the geosynthetic-reinforced and pile-supported model under arbitrary vertical load.The solution is validated by a comparison with the results of existing literatures and finite elements.The parametric analysis shows that the varia⁃tion of cushion thickness shows a significantly greater effect on the structural deformation than the cushion modulus.Increasing the embankment fill height gives full play to the soil arching effect and membrane pulling effect,but leads to a larger pile-soil differential settlement.Appropriately increasing the thickness and modulus of the cushion effectively reduce settlement and improve the pile-soil stress ratio.

关 键 词：桩承加筋路堤 状态空间法 Euler-Bernoulli梁理论 界面摩阻力 非均匀刚度地基 

分 类 号：TU473.1[建筑科学—结构工程]