基于三维Merchant模型的公路改扩建工程路基变形特性研究

陆军,宋亮

交通运输研究 ›› 2018, Vol. 4 ›› Issue (2) : 66-72.

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交通运输研究 ›› 2018, Vol. 4 ›› Issue (2) : 66-72.
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基于三维Merchant模型的公路改扩建工程路基变形特性研究

  • 陆军,宋亮
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Deformation Characteristics of Highway Subgrade in Reorganization and Expansion Engineering Based on 3D Merchant Model

  • LU Jun and SONG Liang
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摘要

为进一步分析不均匀沉降对改扩建工程的影响,提出了适用于新疆地区的拼接路基填筑材料设计指标,采用有限元法分析了填筑材料特性对改扩建公路的影响。首先,介绍了三维Drucker-Prager 模型表达式。考虑到Drucker-Prager 模型无法模拟路基工后沉降中存在的蠕变变形,采用了三维Merchant 模型的Prony 级数表达式模拟蠕变变形量。依据连霍高速(G30) 新疆境内小草湖—乌鲁木齐段改扩建工程标准断面参数,建立了有限元模型并探讨了填筑材料物理参数对新旧路堤附加变形、沉降差异和路面变形的影响规律。结果表明:随着填筑材料弹性模量的增加,新旧路堤附加变形、沉降和沥青路面变形显著减少;拼接路基竖向位移和不均匀沉降随着黏聚力c 的减小,先减小后增大。黏聚力c和内摩擦角j 主要影响范围是新路基中心至右路肩处。

Abstract

To further analyze the effect of differential settlements on highway reconstruction and expansion project, the filling material design indexes of connecting subgrade applied to Xinjiang were put forward, finite element analysis method was used to analyze the influence of the properties of filling materials on highway reconstruction and expansion project. Firstly, a three-dimensional Drucker-Prager model was presented. Considering creep deformation in post-construction settlement couldn′t be simulated by the Drucker-Prager model, an expression of three dimensional Merchant model′s Prony series was utilized to simulate the creep deformation. The parameters of standard cross-section of the reconstruction and extension project of Lianyungang—Horgos expressway (G30) Xiaocao Lake-Urumqi section in Xinjiang were utilized to build a finite element model. In finite element analysis, the influencing rules of filling material′s physical parameters on additive embankment deformation, settlement difference and pavement deformation were discussed respectively. The results show that additive embankment deformation, settlement and pavement deformation are decreased significantly with the increase of filling material′s elasticity modulus. The vertical displacement and uneven settlement of the connecting subgrade decrease at first and then increase with the decreasing of cohesive force. The main impact area of cohesive force and internal friction angle is the range between the center of new subgrade and right road shoulder.

关键词

道路工程 / 路堤变形 / 有限元法 / 改扩建工程 / Merchant模型

Key words

highway engineering / embankment deformation / finite element analysis / reorganization and expansion engineering / Merchant model

引用本文

导出引用
陆军,宋亮. 基于三维Merchant模型的公路改扩建工程路基变形特性研究[J]. 交通运输研究. 2018, 4(2): 66-72
LU Jun and SONG Liang. Deformation Characteristics of Highway Subgrade in Reorganization and Expansion Engineering Based on 3D Merchant Model[J]. Transport Research. 2018, 4(2): 66-72

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基金

交通运输部建设科技项目(2013 318 J08 220)

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