浅埋土洞加筋路基变形的双梁模型解  

Solution of double beam model for deformation of reinforced roadbed with shallow soil hole

作　　者：吴方宇 陈志波[1,2] 邓煜晨 WU Fangyu;CHEN Zhibo;DENG Yuchen(Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350116,China;Fujian Provincial Universities Engineering Research Center of Geological Engineering,Fuzhou 350116,China)

机构地区：[1]福州大学紫金地质与矿业学院,福建福州350116 [2]地质工程福建省高校工程研究中心,福建福州350116

出　　处：《武汉大学学报（工学版）》2024年第5期593-600,共8页Engineering Journal of Wuhan University

基　　金：福建省社会发展引导性(重点)项目(编号:2021Y0004);华东勘测设计院(福建)有限公司科研项目(编号:FH2019-KY006)。

摘　　要：浅埋土洞加筋路基受力机理十分复杂,为探究其变形和受力情况,将路面结构和土工格室简化为考虑抗弯刚度的有限长梁,路堤填土和路基土分别采用Kerr模型和Pasternak模型模拟,构建双梁模型,求解双梁竖向变形解析解。分别采用浅埋土洞加筋路基数值模拟结果与无土洞加筋路基室内试验结果验证双梁模型解析结果的有效性,并基于解析结果分析了深宽比、土工格室抗弯刚度和路基土弹性模量对双梁竖向变形、弯矩和剪力的影响。结果表明:深宽比和路基弹性模量对浅埋土洞加筋路基土洞区域的受力与变形有显著影响,而土工格室抗弯刚度的影响能力与路基弹性模量有关,土洞宽度决定路面结构和土工格室的剪力分布特点。The mechanical mechanism of the reinforced roadbed with shallow soil hole is very complicated.In order to study the deformation and stress of the roadbed,the pavement structure and the geo-cell were simplified into finite-length beams considering the bending rigidity,and the embankment fill and roadbed soil were simulated with Kerr model and Pasternak model respectively.A dual-beam model is constructed to obtain the vertical deformation analytical solutions of the double beam.The numerical simulation results of the reinforced roadbed with shallow soil hole and the laboratory test results of reinforced roadbed with no shallow soil hole are conducted,and the validity of the analytical results of the double-beam model is verified.Based on the analytical results,the effects of the depth to width ratio,the bending stiffness of the geo-cell and the elastic modulus of the roadbed on the vertical deformation,bending moment and shear forces of the double beams are analyzed.The research results show that the depth to width ratio and the elastic modulus of the roadbed have significant effects on the force and deformation of the soil hole area of reinforced roadbed with shallow soil hole,and the influence ability of the bending stiffness of the geo-cell is related to the elastic modulus of the roadbed,and the width determines the shear distribution characteristics of the pavement structure and the geo-cell.

关 键 词：加筋路基 土洞 双梁模型 变形 数值分析 

分 类 号：U416.1[交通运输工程—道路与铁道工程]