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Experimental Study on Shear Strength Parameters of Round Gravel Soils in Plateau Alluvial-Lacustrine Deposits and Its Application

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  • Zhijun Kong

    (Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, China
    College of Civil and Architectural Engineering, Yunnan Agricultural University, Kunming 650201, China)

  • Yanhui Guo

    (Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, China)

  • Shilin Mao

    (Yunnan Construction Investment No. 6 Construction Co., Ltd., Yuxi 653199, China)

  • Wei Zhang

    (Zhongxing Shuchuang (Yunnan) Technology Co., Ltd., Kunming 650011, China)

Abstract

The shear strength parameters of conglomerate soils are crucial to the stability analysis of foundation support when excavating and supporting ultra-deep foundation pits in the highland alluvial lacustrine layer. The difference in water content of conglomerate soils in different regions will directly affect the values of shear strength parameters. At the same time, more research on the shear strength of conglomerate soils under different water contents is required. In this study, a series of large-scale direct shear tests were carried out on the round gravel soil in the plateau alluvial-lacustrine deposit, and the round gravel soil’s shear strength curves under natural and saturated conditions and water content were obtained. The influence of different water content on the shear strength characteristics of the round gravel soil was discussed, and the shear strength parameters of the round gravel soil with different water content were used in the numerical simulation of ultra-deep foundation pit excavation and support. The stress and deformation laws of the foundation pit support were analyzed. The results show that the peak strength of the round gravel soil in the natural water content state appears between 30% and 45% of the shear displacement, while the peak strength in the saturated water content state appears around 45–55% of the shear displacement. The shear strength tends to be stable or slightly weakened with the increase of the shear displacement. The angle of internal friction and cohesion of round gravel soil in the natural water content state is greater than those in the saturated water content state. The simulation of the foundation excavation support shows that the shear strength parameter of the round gravel soil influences the force deformation of the support structure. The higher the water content of the round gravel soil, the more the shear strength parameter affects the soil displacement. The research results can provide some reference for optimizing project design parameters.

Suggested Citation

  • Zhijun Kong & Yanhui Guo & Shilin Mao & Wei Zhang, 2023. "Experimental Study on Shear Strength Parameters of Round Gravel Soils in Plateau Alluvial-Lacustrine Deposits and Its Application," Sustainability, MDPI, vol. 15(5), pages 1-23, February.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:5:p:3954-:d:1076286
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    References listed on IDEAS

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    1. Ruchun Wei & Lele Liu & Chao Jia & Hualin Zhao & Xiao Dong & Qingtao Bu & Changling Liu & Nengyou Wu, 2023. "Undrained Shear Properties of Shallow Clayey-Silty Sediments in the Shenhu Area of South China Sea," Sustainability, MDPI, vol. 15(2), pages 1-15, January.
    2. Lele Liu & Qicheng Sun & Nengyou Wu & Changling Liu & Fulong Ning & Jianchao Cai, 2021. "Fractal Analyses Of The Shape Factor In Kozeny–Carman Equation For Hydraulic Permeability In Hydrate-Bearing Sediments," FRACTALS (fractals), World Scientific Publishing Co. Pte. Ltd., vol. 29(07), pages 1-13, November.
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