The Safety Analysis on External Water Pressure to the Deep Buried Hydraulic Tunnel Lining Based on Coupling Numerical Simulation

ce/papers Pub Date : 2025-03-18 DOI:10.1002/cepa.3245
Yang Wang, Ran Xu
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Abstract

The high external water infiltration pressure of deep buried hydraulic tunnel frequently causes damage to lining structure. The safety analysis on high external water pressure to the lining of deep buried hydraulic tunnel becomes critical work. The stress and seepage coupling interface model is established to simulate the influence of external water pressure on the safety of deep buried hydraulic tunnel lining by means of sensitivity analysis of three parameters including grouting thickness, permeability coefficient of grouting area and the depth of drainage hole. It turns out that the external water pressure decreases with the increase of grouting thickness and the depth of the drainage hole into rock while permeability coefficient shows less effects on it. A series of highly applicable designs are provided aiming to improve the safety of deep buried hydraulic tunnel lining.

基于耦合数值模拟的深埋水工隧洞衬砌外水压安全性分析
深埋水工隧洞的高外入渗压力经常造成衬砌结构的破坏。高外水压对深埋水工隧道衬砌的安全性分析是一项重要的工作。通过对注浆厚度、注浆区渗透系数和排水孔深度3个参数的敏感性分析,建立了应力-渗流耦合界面模型,模拟了外水压对深埋水工隧洞衬砌安全的影响。结果表明,随着注浆厚度和排水孔入岩深度的增加,外水压减小,而渗透系数对其影响较小。为提高深埋水工隧道衬砌的安全性,提出了一系列适用性强的设计方案。
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