Numerical Investigation of the Upside-Down Hanging Well Combined with Curtain Grouting for Strengthening a Flood Control Ancient Levee

Zipeng Qin, Yan Tian (), Siyuan Gao, Jianfen Zhou, Haitao Zhao, Zhizhuo Guo, Tannong Chen and Zhiping Hua
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Zipeng Qin: School of Water Conservancy and Environment Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Yan Tian: College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
Siyuan Gao: Department of Civil Engineering, Imperial College London, London SW7 1BF, UK
Jianfen Zhou: School of Water Conservancy and Environment Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Haitao Zhao: School of Water Conservancy and Environment Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Zhizhuo Guo: School of Water Conservancy and Environment Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Tannong Chen: Quzhou Kecheng District Water Conservancy Bureau, Quzhou 324003, China
Zhiping Hua: Quzhou Kecheng District Water Conservancy Bureau, Quzhou 324003, China

Sustainability, 2023, vol. 15, issue 5, 1-17

Abstract: The ancient levees used for flood control generally exist in the rainy areas of southern China. After years of operation, the levees have lots of problems, such as leakage, swelling, and cracking, which need to be reinforced. In this paper, combined with the characteristics of river water level fluctuations, the effect of the upside-down hanging well and curtain grouting reinforcement of the ancient levee is analyzed by a numerical method, and the variation law of the levee’s stability in the flooding process before and after reinforcement is explored. The study results show that the flooding process significantly affects the pore water pressure of the filling soil between the ancient levee and the well, and has a weak impact on that behind the well, which is conducive to the levee’s stability. The horizontal displacements of the levee and the fill present the opposite change law before and after reinforcement. Before reinforcement, the maximum horizontal displacement reached 2.75 cm, and the displacement was toward the Lan River. This was caused by the deformation of the soil squeezing the levee after the water level rose, which was extremely unfavorable to the levee’s stability. After reinforcement, the levee and fill shifted away from the river, mainly due to the hydrostatic pressures caused by the rising water level. The change in the stability safety factors of the reinforced levee is basically consistent with the flood fluctuation. The minimum value of the safety factors is 1.727, the maximum value is 2.273, and the safety factor only decreases by 24.02%, which is half of the change range of the safety factors before reinforcement. The stability of the reinforced ancient levee is largely improved.

Keywords: safety factor; stability analysis; water level fluctuation; anti-seepage reinforcement; upside-down hanging well; curtain grouting; ancient levee (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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