陡坡地段三排桩板结构路基承载特性仿真研究  

Simulation Study on Bearing Behavior of Three-row Pile-slab Structure Subgrade in Steep Slope Section

作　　者：刘杰[1] 赵莉香[1] 周珩[1] 王迅[1,2] 王武斌[1,2] LIU Jie;ZHAO Lixiang;ZHOU Heng;WANG Xun;WANG Wubin(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High Speed Railway Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 60031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《铁道标准设计》2021年第1期45-50,共6页Railway Standard Design

基　　金：国家自然科学基金项目(51978588);中铁第四勘察设计院集团有限公司科技研究开发计划项目(2011K26-1)。

摘　　要：为研究陡坡段三排桩板结构路基的承载特性,首先通过有限元软件ABAQUS采用强度折减法研究桩板结构加固前后陡坡稳定性,验证结构作用效果;其次分析在ZK荷载作用下,三排桩板结构的受力变形特点;最后对比研究不同类型桩板结构于陡坡路基中的承载特性。结果表明:陡坡地段采用三排桩板结构路基可较好地提高边坡稳定性;承载板上弯矩最大值多发生于桩间位置处,沿线路方向弯矩最大值为299.5 kN·m,沿顺坡方向弯矩最大值为389.4 kN·m,线路方向弯矩较顺坡方向弯矩小约30%,竖向剪力最大值约为500 kN;桩结构受力最大位置为与承载板连接处,最大弯矩、剪力值分别为169.4 kN·m、130.8 kN;三排结构较双排桩板结构在陡坡路基承载特性和控制变形方面均具有一定优势。In order to study the bearing characteristics of three-row pile-slab structure subgrade in steep slope section, the strength reduction method is firstly used with the finite element software ABAQUS to study the stability of the steep slope before and after the reinforcement to verify the reinforcement effect of pile-slab structure. Secondly, the stress and deformation characteristics of three-row pile-slab structure under ZK load are analyzed. Finally, the bearing characteristics of different types of pile-slab structures in steep slope subgrade are compared and studied. The results show that the subgrade reinforced with three-row pile-slab structure can improve the stability of the steep slope;the maximum bending moment on the bearing plate mostly occurs at the place between piles;the maximum bending moment in the railway line direction is 299.5 kN·m, and 389.4 kN·m in the downhill direction;the bending moment in the railway line direction is about 30% smaller than that is the downhill direction;the maximum vertical shear force is about 500 kN;the position of the pile structure’s maximum force is the connection with the bearing plate, and the maximum bending moment and shear force are 169.4 kN· m and 130.8 kN respectively;and the three-row structure has certain advantages over the double-row pile-slab structure in the bearing characteristics and the control of deformation in the steep slope.

关 键 词：铁路路基 陡坡 三排桩板结构 仿真研究 强度折减法 承载特性 变形特性 

分 类 号：U213.152[交通运输工程—道路与铁道工程]