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A three-dimensional fluid-solid coupled numerical modeling of the barrier leakage below the excavation surface due to dewatering
Hydrogeology Journal ( IF 2.8 ) Pub Date : 2020-04-02 , DOI: 10.1007/s10040-020-02142-w
Yong-Xia Wu , Hai-Min Lyu , Shui-Long Shen , Annan Zhou

Abstract

Waterproof curtains are used as barriers to block groundwater during deep excavations; however, in practice, barrier leakage occurs frequently. This paper establishes a three-dimensional (3D) fluid-solid-coupled finite element model to analyse the effect of barrier leakage below the excavation surface. Uniform and local barrier leakages in a confined aquifer are simulated for a constant flow rate and fixed drawdown. The simulated results show that barrier leakage causes a variation in the flow direction, drawdown of the groundwater head outside of excavation, and significant additional deformation in the longitudinal direction. The factors influencing drawdown and ground settlement induced by leakage include leakage location, leakage area, barrier penetration depth, pumping-well penetration depth, and aquifer anisotropy. In addition, the simulation results show that the drawdown-time curves under various leakage conditions have similar patterns.



中文翻译:

基于脱水的开挖面下方障碍物渗流的三维流固耦合数值模拟

摘要

防水帷幕用作在深基坑开挖过程中阻挡地下水的屏障;然而,实际上,势垒泄漏经常发生。本文建立了三维(3D)流固耦合有限元模型,以分析开挖面下方障碍物泄漏的影响。模拟了密闭含水层中的均匀和局部屏障泄漏,以得到恒定的流量和固定的水位下降。模拟结果表明,屏障泄漏会引起流向变化,开挖外部的地下水位下降以及沿纵向的明显附加变形。由渗漏引起的影响降落和地面沉降的因素包括渗漏位置,渗漏面积,障碍渗透深度,泵井渗透深度和含水层各向异性。此外,

更新日期:2020-04-11
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