Settlement patterns of mountainous half-filled and half-cut widened subgrade with retaining wall

The settlement of widened highway subgrade in mountainous area is not only affected by the interaction between new and existing subgrade, but also seriously restricted by the external retaining wall. Based on the practical engineering of half-filled and half-cut widened mountainous highway subgrade...

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Bibliographic Details
Published inJournal of mountain science Vol. 18; no. 10; pp. 2791 - 2802
Main Authors Fu, Yong-guo, Jiang, Xin, Gu, Han-yan, Qiu, Yan-jun
Format Journal Article
LanguageEnglish
Published Heidelberg Science Press 01.10.2021
Springer Nature B.V
Subjects
Construction
Earth and Environmental Science
Earth Sciences
Ecology
Environment
Finite element method
Geography
Inclination
Mathematical models
Mountain regions
Mountainous areas
Mountains
Numerical models
Original Article
Pavements
Retaining walls
Subgrades
Mountain road widening
Pavement utilization
Subgrade settlement
Balance weight retaining wall
Retaining wall inclination
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Summary:The settlement of widened highway subgrade in mountainous area is not only affected by the interaction between new and existing subgrade, but also seriously restricted by the external retaining wall. Based on the practical engineering of half-filled and half-cut widened mountainous highway subgrade with external balance weight retaining wall (BWRW), a sophisticated finite element numerical model is established. The evolution law of subgrade settlement is revealed during the whole process of new subgrade filling and BWRW inclination after construction. The settlement component of subgrade is clarified considering whether the existing pavement continues to be used. The results show that the additional settlement caused by the BWRW inclination after construction cannot be ignored in the widening and reconstruction of mountainous highway subgrade. In addition, pursuant to the comprehensive design of subgrade and pavement, the component of subgrade settlement should be determined according to whether the existing pavement continues to be used, while considering the influence of BWRW inclination after construction. When the existing pavement continues to be used, the settlement of the existing subgrade is caused by the new subgrade filling and the BWRW inclination after construction. On the contrary, the settlement is only caused by the BWRW inclination after construction.
ISSN:1672-6316
1993-0321
1008-2786
DOI:10.1007/s11629-020-6551-z