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Experimental and Numerical Analyses on the Frost Heave Deformation of Reclaimed Gravel from a Tunnel Excavation as a Structural Fill in Cold Mountainous Regions

Author

Listed:
  • Libo Wu

    (School of Civil Engineering and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China)

  • Fujun Niu

    (School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China
    State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)

  • Zhanju Lin

    (State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)

  • Yunhu Shang

    (State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)

  • Sanjay Nimbalkar

    (School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia)

  • Daichao Sheng

    (School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia)

Abstract

In cold mountainous regions of China, the construction of highways is challenging, owing to frost damage of weak subgrade soils and the difficulties posed from dealing with waste materials derived from tunnel excavation. In order to address these issues, Wu et al. proposed a new approach of using coarse gravel reclaimed from tunnel excavation as an antifrost structural fill replacing the top layer of frost-susceptible subgrade soils. This approach was validated against the results of field investigations on the highway between Tanchang county and Diebu county (the TDH) in south Gansu Province, northwest China, but only studied the results of the first year. As an environmentally friendly and sustainable ground-treatment method, this strategy merits extensive research and widespread implementation. In this study, the frost-heave deformation of a two-year monitoring period is investigated through a field trial, and a frost-heave model is applied to explore the growth of the ice lens and accomplish the quantitative prediction of frost heave based on experimental measurements. The fine particles of reclaimed gravel sediments from the Lazikou tunnel are found to be resistant to frost. The measured values of the maximum frost heave are significantly lower than the permissible limit of 50 mm specified in the Chinese standards. The reclaimed gravel could significantly reduce frost heave. With a 2 m thick gravel fill, frost heave could be reduced by more than 70% when the groundwater table is located at a depth greater than 3 m. An empirical relationship to predict the frost heave in terms of the gravel fill thickness is proposed. This study presents a safe and sustainable approach focusing on the construction of highways in cold mountainous regions.

Suggested Citation

  • Libo Wu & Fujun Niu & Zhanju Lin & Yunhu Shang & Sanjay Nimbalkar & Daichao Sheng, 2023. "Experimental and Numerical Analyses on the Frost Heave Deformation of Reclaimed Gravel from a Tunnel Excavation as a Structural Fill in Cold Mountainous Regions," Sustainability, MDPI, vol. 15(18), pages 1-20, September.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:18:p:13397-:d:1234735
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    References listed on IDEAS

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    1. Pei, Wansheng & Zhang, Mingyi & Lai, Yuanming & Yan, Zhongrui & Li, Shuangyang, 2019. "Evaluation of the ground heat control capacity of a novel air-L-shaped TPCT-ground (ALTG) cooling system in cold regions," Energy, Elsevier, vol. 179(C), pages 655-668.
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