低矮路堤下膨胀土地基渗流与变形耦合研究

›› 2014, Vol. 35 ›› Issue (S2): 232-239.

低矮路堤下膨胀土地基渗流与变形耦合研究

陈伟志^{1, 2}，蒋关鲁^{1, 2}，王大伟¹，袁泽华¹，王智猛³，李安洪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. 中铁二院工程集团有限责任公司，成都 610031

收稿日期:2013-12-10 出版日期:2014-10-31 发布日期:2014-11-12
通讯作者: 蒋关鲁，男，1962年生，博士，教授，主要从事道路与铁道工程方向研究。E-mail: wgljiang@swjtu.edu.cn E-mail:chenweizhi55@163.com
作者简介:陈伟志，男，1985年生，博士研究生，主要从事高速铁路路基及地基处理设计等方面的研究。
基金资助:
铁道部科技研究开发计划项目(No. 2010G003-F)。

Analysis of coupled seepage and deformation of expansive soil foundation under low embankment

CHEN Wei-zhi^{1, 2}，JIANG Guan-lu^{1, 2}，WANG Da-wei¹，YUAN Ze-hua¹， WANG Zhi-memg³，LI An-hong³

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. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Received:2013-12-10 Online:2014-10-31 Published:2014-11-12

摘要/Abstract

摘要： 二维渗流与变形耦合控制方程是基于流体质量守恒、Darcy定律及膨胀土弹性本构方程得出的。结合云桂高速铁路低矮路堤下膨胀土地基现场浸水试验，并采用考虑耦合和不考虑耦合两种数值模拟方法，分析了低矮路堤下膨胀土地基的膨胀变形特性。研究结果表明，耦合情况下地基表面膨胀变形呈双曲线变化，非耦合情况下地基表面膨胀变形随时间的增加而逐渐增大，对同一时间而言，未考虑耦合效应数值模拟得到的膨胀变形落后于考虑耦合影响的膨胀变形；耦合与非耦合情况下地基的相对膨胀率沿深度方向呈衰减变化。数值计算结果与现场试验结果比较表明，不考虑耦合影响的数值模拟方法难以描述人工浸水条件下膨胀土地基的膨胀变形规律，而考虑耦合影响的数值模拟方法与现场实测值吻合较好。

关键词: 低矮路堤, 膨胀土地基, 渗流与变形, 耦合, 人工浸水

Abstract: Based on the mass conservation of fluid, Darcy law and elastic constitutive equation of expansive soil, two-dimensional equations of coupled seepage and deformation in expansive soil are obtained. Combined with the field soaking test on expansive soil foundation under low embankment of Yun-Gui high-speed railway, then both the numerical simulation considering coupling and that without considering coupling are used to analyze the swelling deformation characteristics of expansive soil foundation under low embankment. The study results indicate that the swelling deformation of ground surface can be fitted with hyperbola in the coupled case, but it increases gradually with time in the uncoupled case. The swelling deformation obtained from the numerical simulation which did not consider coupling is less than that obtained from the numerical simulation considering coupling at the same time. The relative expansion ratio decreases along the depth of foundation in the coupled and uncoupled case. In addition, the numerical calculated values are compared with test results in field. It is pointed out that the numerical simulation without considering the effects of coupling is difficult to describe the swelling deformation of expansive soil foundation under the artificial soaking condition. On the other hand, the results from the numerical simulation considering the impacts of coupling agree well with the measured results.

Key words: low embankment, expansive soil foundation, seepage and deformation, coupling, artificial soaking

中图分类号:

TU 443

陈伟志，蒋关鲁，王大伟，袁泽华，王智猛，李安洪，. 低矮路堤下膨胀土地基渗流与变形耦合研究[J]. , 2014, 35(S2): 232-239.

CHEN Wei-zhi ，JIANG Guan-lu ，WANG Da-wei ，YUAN Ze-hua ， WANG Zhi-memg ，LI An-hong，. Analysis of coupled seepage and deformation of expansive soil foundation under low embankment[J]. , 2014, 35(S2): 232-239.

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