Effect of excavation-induced phreatic line drawdown on mountain tunnel seepage discharge in horizontal strata

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-02-12 DOI:10.1007/s10064-025-04127-z

Wei Meng, Ziquan Chen, Zheng Li, Chuan He, Xuefu Zhang, Zihan Zhou

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Abstract

This study investigates the effect of excavation-induced phreatic line drawdown on seepage discharge in mountain tunnels situated in horizontal strata. By integrating the Dupuit hypotheses with the Boussinesq equation, theoretical solutions were developed to describe the equilibrium state phreatic line and quantify the corresponding seepage discharge. These solutions were derived using the integral method and were further analyzed to identify potential sources of error. To validate the theoretical framework, numerical simulations were conducted using ABAQUS, revealing strong correlations and offering insights into discrepancies. Key parameters influencing the equilibrium state phreatic line and seepage discharge were systematically examined, including hydraulic conductivity, the horizontal distance from the tunnel’s central axis to the lateral boundary of groundwater recharge, recharge height, the vertical distance from the tunnel’s central axis to an impervious layer, tunnel radius, and the thickness of horizontal strata. The applicability conditions of the theoretical solutions were also established through comparative analysis with numerical results. Despite the notable relative errors inherent in the theoretical solutions, they account for phreatic line drawdown caused by tunnel excavation, offering an analytical tool for preliminary design and seepage evaluation in tunnel engineering.

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.