[1] Weng Xiaolin, Cui Zhifang, Song Wenjia, Ma Haohao, et al. Response mechanism for widened pavement structuresubjected to ground differential settlement [J]. Journal of Southeast University (English Edition), 2013, 29 (1): 73-78. [doi:10.3969/j.issn.1003-7985.2013.01.015]

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Response mechanism for widened pavement structuresubjected to ground differential settlement()

差异沉降条件下拓宽路面结构层响应机制

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

29

Issue:

2013 1

Page:

73-78

Research Field:

Traffic and Transportation Engineering

Publishing date:

2013-03-20

Info

Title:

Response mechanism for widened pavement structuresubjected to ground differential settlement

差异沉降条件下拓宽路面结构层响应机制

Author(s):

Weng Xiaolin¹;  Cui Zhifang²;  Song Wenjia¹;  Ma Haohao¹

¹Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, China
² He’nan Zhongyuan Expressway Co., Ltd., Zhengzhou 450052, China

翁效林¹;  崔志方²;  宋文佳¹;  马豪豪¹

¹长安大学特殊地区公路工程教育部重点实验室, 西安710064; ²河南中原高速公路股份有限公司, 郑州450052

Keywords:

widened road;  full-size model;  finite element analysis;  additional stress;  critical differential settlement

拓宽道路;  足尺模型;  有限元分析;  附加应力;  临界差异沉降

PACS:

U416.16

DOI:

10.3969/j.issn.1003-7985.2013.01.015

Abstract:

By the use of a large-scale ground differential settlement simulator, a full-size model test is performed to study the strain response and the deformation behavior of both the wearing course of asphalt cement and the base course of cement-stabilized gravel. Moreover, with the differential settlement at the bottom of the pavement structure as the constraint condition, a plane finite element model is established, which is used to study the stress variation of different pavement layers in response to the differential settlement of varying magnitudes. It shows that, under the effects of the ground differential settlement, the wearing course is subjected to the tensile stress while the base course to the compressive stress and the maximum additional tensile stress and compressive stress occur in the area of 1 m from the splicing joint between the new and the old subgrade. Plastic deformation develops in both layers when the ground differential settlement reaches 14 cm. When the differential settlement at the bottom of the pavement goes up to 1 cm, the maximum additional stress in the surface of the base course will reach 0.28 MPa, which surpasses 0.276 MPa that is specified in the current specifications as the maximum splitting tensile strength for cement-stabilized base material.

借助大型路基差异沉降平台, 对沥青混凝土路面层与水泥稳定碎石半刚性基层的应变响应和沉降变形特征足尺模型进行了试验研究, 并结合足尺模型试验研究成果, 建立了路面结构层对路基不协调变形力学响应的有限元模型, 研究了路面结构层的应力变化特征.研究结果表明:在地基差异沉降作用下, 半刚性基层整体呈现受压状态, 沥青混凝土面层整体呈现受拉状态, 最大附加拉应力和最大附加压应力都在距离路面接缝位置1 m的位置出现.在地基差异沉降达到14 cm时, 路面结构层开始出现塑性变形;当路面结构层底部差异沉降量超过约1 cm时, 基层的上部最大附加拉应力为0.28 MPa, 超过了现行规格规定的基层材料水泥稳定级配碎石的劈裂抗拉强度.

References:

[1] Ma Xiaohui. Research on mechanic response of jointed pavement structure in highway widening project[D].Shanghai: School of Transportation Engineering, Tongji University, 2008.(in Chinese)
[2] Tan Zhiming, Yao Zukang. Structural analysis of concrete pavements on soft subsoils with differential settlements[J].The Journal of Geotechnical Engineering, 1989, 11(2):54-63.(in Chinese)
[3] Huang Qinlong, Lin Jianming, Qian Jinsong. Influence of pavement under discrepant deformation after construction between existing subgrade and that to be widened[J]. Journal of Tongji University: Natural Science, 2005, 33(1):759-762.(in Chinese)
[4] Allersma H G B, Ravenswaay L, Vos E. Investigation of road widening on soft soil using a small centrifuge [J].Transportation Research Record, 1994, 1462:47-53.
[5] Han J, Akins K. Use of geogrid-reinforced and pile-supported earth structures[C]//Proceedings of International Deep Foundation Congress. Orlando, FL, USA, 2002: 668-679.
[6] Habib H A A, Brugman M H A, Uijlting B G J. Widening of Road N247 founded on a geogrid reinforced mattress on piles[C]//Proceedings of the Seventh International Conference on Geosynthetics. Nice, France, 2002: 369-372.
[7] Fu Zhen, Wang Xuancang, Chen Xingguang, et al. Differential settlement characteristics and influencing factors of widening subgrade[J].Journal of Traffic and Transportation Engineering, 2007, 7(1):54-55.(in Chinese)
[8] Weng Xiaolin, Wang Wei, Liu Baojian. Model experimental research on deformation characteristics of widening loess roadbed and dynamic compaction method effect[J].China Journal of Highway and Transport, 2011, 24(2):17-22.(in Chinese)
[9] Weng Xiaolin, Zhang Liujun, Li Lintao, et al. Model test on control techniques for differential settlement of roading widening[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(1):159-164.(in Chinese)

Memo

Memo:

Biography: Weng Xiaolin(1980—), male, doctor, associate professor, wengxiaolin2000@sohu.com.
Foundation items: The National Natural Science Foundation of China(No.51008032), the China Postdoctoral Science Foundation(No.2011M501430), the Foundation of Central Universities of Ministry of Education(No.CHD2012JC011, CHD2011JC083).
Citation: Weng Xiaolin, Cui Zhifang, Song Wenjia, et al. Response mechanism for widened pavement structure subjected to ground differential settlement[J].Journal of Southeast University(English Edition), 2013, 29(1):73-78.[doi:10.3969/j.issn.1003-7985.2013.01.015]

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