黄土高路堤三维固结数值解法

景宏君; <styled-content style-type="shadingborder">胡长顺</styled-content>; 王秉纲; 丁宁; 李跃才

黄土高路堤三维固结数值解法

1.
西安交通大学航天航空学院，陕西西安 710049
2.
长安大学公路学院，陕西西安 710064
3.
陕西省榆林市交通局，陕西咸阳 712000
4.
陕西省榆林市地方公路管理处，陕西榆林 719000
5.
陕西省成通机械化公路工程有限责任公司，陕西西安 710068

基金项目:

国家西部交通建设科技项目 200131800018

详细信息

作者简介:
景宏君(1974-), 男, 陕西吴堡人, 西安交通大学讲师, 工学博士, 从事道路与岩土工程力学研究

中图分类号: U416.169
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出版历程
- 收稿日期: 2006-06-28
- 刊出日期: 2007-04-25

3-D consolidation numerical calculation of loess-high embankment

Jing Hong-jun^1
,,
Hu Chang-shun" class="mainColor" data-relate="">Hu Chang-shun²,
Wang Bing-gang²,
Ding Ning³,
Li Yue-cai⁴

1.
School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
2.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
3.
Xianyang Municipal Communications Bureau of Shaanxi Province, Xianyang 712000, Shaanxi, China
4.
Yulin Municipal Road Administration Department of Shaanxi Province, Yulin 719000, Shaanxi, China
5.
Chengtong Mechanisation Highway Engineering Ltd.Co.of Shaanxi Province, Xi'an 710068, Shaanxi, China

More Information

Author Bio:
Jing Hong-jun(1974-), male, PhD, lecturer, +86-29-33219809, jinghj@public.xa.sn.cn

摘要

摘要: 针对黄土的结构性、欠压密性、非饱和性与各向异性特点, 将黄土视为非饱和土, 基于非饱和土力学理论, 建立了相应的三维固结方程组, 利用有限元法, 分析了黄土的固结变形特征。分析发现黄土高路堤经压实后, 其垂直位移最大值发生在路堤中部, 呈抛物线趋势; 位移在路堤坡脚处最小, 路堤变形趋势在上部呈向内、向下移动的趋势, 即呈现“凹盆”, 在1/3²/3路堤高处呈向外“挤出”趋势; 对于非饱和黄土, 在瞬时加载后, 其表层沉降变形可分为瞬时沉降和土体固结沉降, 前者为主要变形。结果表明建立的非饱和黄土三维固结方程能很好地模拟与分析黄土路堤的固结变形, 具有较好的应用前景。
- 路基工程 /
- 黄土 /
- 非饱和土 /
- 三维固结 /
- 数值解法 /
- 固结变形
Abstract: According to the structural, under-compressible, unsaturated and anisotropic characters of loess, loess was regarded as unsaturated soil, its 3-D consolidation equations were derived based on unsaturated soil theory, and its consolidation deformation characters were analyzed by FEM.It is pointed that compressed subgrade settlement deformation appears "sag" shape, its maximum settlement lies in embackment center, embackment shoulder settlement is minimum, and 1/3~2/3 of embankment high appears outward "extrusion" tendency; stress change tendency is inward and downward increasing, and minimum shear stress lies in slope toe; for unsaturated soil, after instantaneous loading, its surface settlement contains instantaneous settlement and soil mass consolidation settlement, and the former is main deformation.Analysis result shows derived unsaturated loess 3-D consolidation equations can well simulate and analyze the consolidation deformation of loess embankment, and its application prospect is quite good.
- subgrade engineering /
- loess /
- unsaturated soil /
- 3-D consolidation /
- numerical calculation /
- consolidation deformation

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图 1 孔隙流体平衡模型

Figure 1. Pore fluid equilibrium model

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图 2 黄土高路堤断面

Figure 2. Section of loess-high embankment

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图 3 高路堤中心沉降-时间曲线

Figure 3. Displacement and time curves of high embankment center

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图 4 固结度与黄土路基深度关系

Figure 4. Relationship of consolidation degree and loess subgrade depth

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图 5 水平等值位移

Figure 5. Horizontal equivalence displacement

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图 6 垂直等值位移

Figure 6. Vertical equivalence displacement

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图 7 道路中线沉降

Figure 7. Road centre line displacement

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图 8 等值剪应力

Figure 8. Chorogram shear

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表 1 基本参数

Table 1. Basic parameters

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表 2 基本参数初值

Table 2. Initial values of basic parameters

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参考文献(10)

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