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2025 Vol. 52, No. 3
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DENG Guohua, GAO Huyan, ZHENG Jianguo, YU Wenlong, KANG Jiawei. Calculation method of dewatering settlement in saturated loess stratum[J]. Hydrogeology & Engineering Geology, 2025, 52(3): 174-185. doi: 10.16030/j.cnki.issn.1000-3665.202312039
Citation: DENG Guohua, GAO Huyan, ZHENG Jianguo, YU Wenlong, KANG Jiawei. Calculation method of dewatering settlement in saturated loess stratum[J]. Hydrogeology & Engineering Geology, 2025, 52(3): 174-185. doi: 10.16030/j.cnki.issn.1000-3665.202312039
shu

Calculation method of dewatering settlement in saturated loess stratum

  • 1.

    School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an, Shaanxi　710048, China

  • 2.

    Xi’an Loess Underground Engineering Technology Consulting Co. Ltd., Xi’an, Shaanxi　710000, China

  • 3.

    Xi’an Rail Transit Group Co. Ltd., Xi’an, Shaanxi　710018, China

  • 4.

    Mechanical Industry Survey and Design Research Institute Co. Ltd., Xi’an, Shaanxi　710043, China

  • 5.

    Guangzhou Metro Design and Research Institute Co. Ltd., Guangzhou, Guangdong　510010, China

Received Date:  25 December 2023
Revised Date:  01 March 2024
Publish Date:  15 May 2025
    Abstract

  • In the construction of underground engineering with complex surrounding environment, reasonable prediction and evaluation of the influence of precipitation on the surrounding environment is a key problem to control the feasibility of the project. At present, the calculation of dewatering-induced settlement using the layered summation method heavily relies on empirical coefficients, leading to significant variability in predictions and deviations from actual observations. To predict the precipitation settlement of loess reasonably and accurately, based on the analysis of the physical properties of saturated loess, the void ratio and liquid index were introduced as key indicators to characterize both deformation potential and the deformation’s difficulty in the dewatering process. The practical calculation method of dewatering settlement of saturated loess stratum was established, and settlement verification was carried out at multiple sites. The results show that depending on the overlying pressure and groundwater action mode, saturated loess can form uncompacted saturated loess and compact saturated loess. The physical properties and dewatering settlement deformation of the two types of loess are different. The main physical property indexes affecting dewatering deposition deformation are the porosity ratio and liquid property index in the initial state, reflecting the deformation potential and the difficulty of deformation of saturated loess, respectively. The comparison between the calculation and measurement of six sites shows that the dewatering subsidence in the loess area mainly occurs in compact saturated loess where the macroporous structure still exists. The proposed e-IL method, incorporating void ratio and liquid index, effectively captures the settlement behavior of saturated loess. This study provides effective technical method for designing and constructing dewatering engineering in the loess area.

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