基于耦合FEM-SPH的桩承式路基土拱相互作用研究  

A Coupled FEM-SPH Investigation into Interaction of Soil Arching inPile-supported Embankment

作　　者：黄华杰 何润 丘元毅 熊昊 韩凯航 黄明峰 HUANG Huajie;HE Run;QIU Yuanyi;XIONG Hao;HAN Kaihang;HUANG Mingfeng(China First Highway Xiamen Engineering Co.,Ltd.,Xiamen,Fujian 361021,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,Guangdong 518054,China;Key Laboratory of Coastal Urban Resilient Infrastructures,Ministryof Education,Shenzhen University,Shenzhen,Guangdong 518060,China;Shenzhen Key Laboratory of Green,Efficient and Intelligent Construction of Underground Metro Station,Shenzhen University,Shenzhen,Guangdong 518060,China)

机构地区：[1]中交一公局厦门工程有限公司,福建厦门361021 [2]深圳大学土木与交通工程学院,广东深圳518054 [3]深圳大学滨海城市韧性基础设施教育部重点实验室,广东深圳518060 [4]深圳大学深圳市地铁地下车站绿色高效智能建造重点实验室,广东深圳518060

出　　处：《公路工程》2025年第1期129-137,共9页Highway Engineering

基　　金：国家自然科学基金青年科学基金项目(52208354);国家自然科学基金重大项目(52090084)。

摘　　要：土拱效应是一种在桩基路堤中广泛存在的现象,会诱发土体的荷载分布和变形特征等力学行为的演变。采用一种基于有限元(FEM)和光滑流体动力学(SPH)的耦合方法,对桩承式路基中出现的土拱效应相互作用进行系统研究。通过与真实活板门试验结果进行对比,验证了该耦合方法和模型的可行性。基于该FEM-SPH数值模型,通过改变活板门的间距和覆盖层土壤的厚度,研究了土拱的相互作用。研究发现,3种不同的土体变形模式对应于不同程度的土拱相互作用,分别为三角形模式、双三角形模式和梯形模式。研究结果表明,土拱的相互作用越强,越有利于等沉降平面的形成,同时该平面的出现意味着上方土体的差异沉降消失。当活板门间距小于活板门宽度时,土拱的相互作用才能显著地削弱土拱的荷载转移的能力;最后,对破坏平面与等沉降平面高度进行了比较分析。The soil arch effect is a widespread phenomenon in the pile-supported embankment,which may change the mechanical behavior such as load distribution and deformation characteristics of the soil,etc.In this paper,a coupled finite element(FEM)and smooth fluid force sub-method(SPH)approach is proposed to investigate the soil-arch effect interactions occurring in pile-supported embankments.The feasibility of the coupling method and model is verified by comparing it with the experimental results of the real trapdoor.Based on this coupled FEM-SPH model,the interaction of the soil arching is investigated by varying the spacing of the trapdoor and the thickness of the overburden soil.Three different deformation patterns corresponding to different degrees of arching interaction are found,namely triangular mode,double triangular mode,and trapezoidal mode.The results show that the stronger the interaction of soil arching is,the more favorable the formation of an equal settlement plane is,of which appearance indicates the disappearance of the differential settlement of the upper soil.The interaction of soil arches can weaken the load transfer capacity of soil arching significantly only when the spacing of the trapdoor is less than the width of the trapdoor.Finally,a comparative analysis of the height of the failure surface and the equal settlement plane is carried out.

关 键 词：公路路基 数值计算 土拱效应 相互作用 破坏机制 

分 类 号：U416.1[交通运输工程—道路与铁道工程]