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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第4期    总第296期    2019年4月

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文章编号:1672-7207(2019)04-0931-08
加筋护坡路堤沉降特性及其控制指标研究
杨果林1,段君义1,胡敏1,罗光财2,邱明明1, 3,林宇亮1

(1. 中南大学 土木工程学院,湖南 长沙,410075;
2. 中建五局土木工程有限公司,湖南 长沙,410004;
3. 延安大学 建筑工程学院,陕西 延安,716000
)

摘 要: 为充分利用部分工程性质不良的土体作为路基填料,常采用加筋护坡措施来保障路堤稳定性,但加筋处理与填料差异性使得路堤沉降分布规律变得复杂,通过建立加筋护坡路堤数值模型,分析路面荷载作用下路堤顶面沉降分布形式,提出采用改进的双曲线函数对其拟合,并得到对应的拟合函数参数。基于路面结构有限元模型,分析不同差异沉降作用下路面结构附加应力。根据路面结构承载能力给出相应的差异沉降控制标准,并通过工程实例对此进行说明。研究结果表明:在差异沉降作用下,加筋护坡路堤的路面结构呈上部受压、下部受拉的受力特征,且最大附加应力发生在加筋范围内;路面结构附加应力与最大差异沉降量、双曲线函数拟合参数a/b之间均呈显著线性关系,a/b能够反映沉降分布曲线的几何弯曲程度;以a/b作为该类路堤形式的差异沉降控制指标,辅以控制最大差异沉降量。

 

关键字: 加筋护坡路堤;数值模拟;沉降控制;路面结构;附加应力

Research on settlement characteristics of embankment enclosed by reinforced soil and its control index
YANG Guolin1, DUAN Junyi1, HU Min1, LUO Guangcai2, QIU Mingming1,3, LIN Yuliang1

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Civil Engineering Co. Ltd., China Construction Fifth Engineering Bureau, Changsha 410004, China;
3. Architectural Engineering Institute, Yanan University, Yanan 716000, China

Abstract:Considering that reinforced slope protection is often used to make full use of the soil with some poor engineering properties as subgrade filling and ensure the stability of embankment, but the distribution of embankment settlement is complicated because of reinforcement treatment and fillings difference, a numerical model of reinforced soil wrapping embankment was established, and the settlement distribution law of embankment surface was analyzed under pavement uniform loading. An improved hyperbolic function was put forward to fit the settlement curve, and the corresponding fitting parameters were obtained. Then, the additional stresses of pavement structure with different differential settlements were studied based on numerical model of pavement structure. Subsequently, the corresponding control criterion of differential settlement was given according to the bearing capacity of pavement structure, and an engineering case was used to illustrate this empirical approach. The results show that the pavement structure of reinforced soil wrapping embankment is characterized by upper compression and lower tension with differential settlements, and the maximum additional stress occurs in the reinforcement region. The additional stress of the pavement structure has significant linear relationship with the maximum differential settlement as well as its hyperbolic function parameter a/b, and a/b can reflect the geometric bending degree of the distribution curve of surface settlement. Therefore, a/b is used as the differential settlement control index of this type of embankment, and supplemented by the maximum differential settlement.

 

Key words: reinforced soil wrapping embankment; numerical simulation; settlement control; pavement structure; additional stress

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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