山区公路拓宽路基与衡重式挡土墙动态相互作用的数值模拟

›› 2014, Vol. 35 ›› Issue (S1): 443-450.

山区公路拓宽路基与衡重式挡土墙动态相互作用的数值模拟

蒋鑫^{1, 2, 3}，耿建宇^{1, 2, 3}，曾诚^{1, 2, 3}，邱延峻^{1, 2, 3}

1. 西南交通大学土木工程学院，成都 610031；2. 西南交通大学道路工程四川省重点实验室，成都 610031； 3. 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

收稿日期:2013-07-17 出版日期:2014-06-10 发布日期:2014-06-20
作者简介:蒋鑫，男，1976年生，博士，副教授，主要从事道路路基路面工程方面的科研与教学工作
基金资助:
中央高校基本科研业务费专项资金资助（No. SWJTU12CX067）；中央高校基本科研业务费专项资金资助（No. SWJTU12ZT05）。

Numerical simulation of dynamic interaction between widening embankment and balance weight retaining wall in mountain region

JIANG Xin^{1, 2, 3}, GENG Jian-yu^{1, 2, 3}, ZENG Cheng^{1, 2, 3}, QIU Yan-jun^{1, 2, 3}

1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Key Laboratory of Highway Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China; 3. Key Laboratory of High-speed Railway Engineering of Education Ministry, Southwest Jiaotong University, Chengdu 610031, China

Received:2013-07-17 Online:2014-06-10 Published:2014-06-20

摘要/Abstract

摘要： 针对山区公路路基拓宽改建的特殊性，运用非线性有限元法，开展衡重式挡土墙修建、新路基逐层分步填筑的动态施工力学行为数值模拟。针对新路基是否加筋、加筋层位以及衡重台上下方新路基填土压实状况的差异性，对新旧路基稳定安全性、滑动面形态、沉降、挡土墙变位等力学响应的影响开展参数敏感性分析。结合室内模拟墙体不同主动位移模式下拓宽路基土工离心模型试验成果，考察新旧路基顶面沉降与挡土墙变位的动态耦合关系。在山区公路路基拓宽改建动态施工中，挡土墙的变位和新旧路基顶面沉降、差异沉降相互耦合，呈正相关关系。衡重台下方新路基填土压实不足会导致新旧路基顶面差异沉降增大。挡土墙主动外倾诱发新旧路基顶面产生较大附加（差异）沉降，宜对新路基自重压密作用造成的差异沉降予以适当修正放大后进行上承路面结构设计。

关键词: 山区公路, 路基拓宽改建, 土-结构相互作用, 附加差异沉降, 有限元法

Abstract: Non-linear finite element method (FEM) is conducted to simulate the dynamic construction of balance weight retaining wall building and new embankment fractional filling considering the mountain region highway embankment widening particularity. The effects of new embankment geosynthetic reinforcement and fill compaction condition on the embankment stability, slip surface behavior, settlement and retaining wall displacement are analyzed. The dynamic coupling relationship between embankment settlement and retaining wall displacement is investigated combined with the geotechnical centrifuge model tests which simulate the retaining wall different displacement modes in mountain region embankment widening project. The retaining wall displacement and embankment settlement, differential settlement are intercoupled. The embankment differential settlement will increase for the insufficient compaction under the equilibrator. The retaining wall leaning toward will induce additional embankment differential settlement. The pavement structure design should consider the magnitude modification of differential settlement induced by new embankment dead weight compaction.

Key words: mountain region highway, embankment widening reconstruction, soil-structure interaction, additional differential settlement, finite element method

中图分类号:

U 418.8

蒋鑫，耿建宇，曾诚，邱延峻 , . 山区公路拓宽路基与衡重式挡土墙动态相互作用的数值模拟[J]. , 2014, 35(S1): 443-450.

JIANG Xin , GENG Jian-yu , ZENG Cheng , QIU Yan-jun , . Numerical simulation of dynamic interaction between widening embankment and balance weight retaining wall in mountain region[J]. , 2014, 35(S1): 443-450.

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