A new numerical method for the analysis of monolithic seepage problems with complex drainage systems in a groundwater recharge area for a hydropower station in China

IF 1.1 4区地球科学 Q3 GEOLOGY

Geologia Croatica Pub Date : 2019-12-17 DOI:10.4154/gc.2019.24

Y. Jun, Liu Si-hong, Wei Ying-qi, Jin Song-Li, Cai Hong, Xiao Jian-zhang

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引用次数: 3

Abstract

After construction of a dam impounding water in a reservoir, a monolithic seepage field develops in the surrounding rock mass. Here, a new finite element method is proposed for determining the shape and characteristics of the 3D monolithic seepage field including the free surface, considering complex drainage systems consisting of densely-spaced drainage holes and drainage galleries. To this end, the previously proposed virtual flux method is improved by a refined numerical integration scheme and a regularized Heaviside function for distinguishing the subregions below and above the free surface within a particular finite element. Leakage and overflow drainage holes are modeled as internal boundaries. The proposed numerical method is verified by an academic example, for which the analytical solution is available. Finally, the numerical simulation of the seepage field developing in the vicinity of a high dam and underground power house, constructed in the context of a hydropower plant project in China is used to show its application to a problem in engineering practice.

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分析中国水电站地下水补给区复杂排水系统整体渗流问题的一种新的数值方法

水库蓄水后，周围岩体形成了整体渗流场。考虑到由密集排水孔和排水廊道组成的复杂排水系统，提出了一种新的有限元方法来确定包括自由面在内的三维整体渗流场的形状和特征。为此，先前提出的虚拟通量方法通过精细的数值积分方案和正则化的Heaviside函数进行了改进，用于区分特定有限元内自由表面下方和上方的子区域。渗漏和溢流排水孔被建模为内部边界。通过一个实例验证了所提出的数值方法，并给出了解析解。最后，以中国某水电站工程为背景，对高坝和地下厂房附近渗流场的发展进行了数值模拟，以表明其在工程实践中的应用。

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来源期刊

Geologia Croatica GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

2.90

自引率

23.10%

发文量

审稿时长

>12 weeks

期刊介绍： Geologia Croatica welcomes original scientific papers dealing with diverse aspects of geology and geological engineering, the history of the Earth, and the physical changes that the Earth has undergone or it is undergoing. The Journal covers a wide spectrum of geology disciplines (palaeontology, stratigraphy, mineralogy, sedimentology, petrology, geochemistry, structural geology, karstology, hydrogeology and engineering geology) including pedogenesis, petroleum geology and environmental geology. Papers especially concerning the Pannonian Basin, Dinarides, the Adriatic/Mediterranean region, as well as notes and reviews interesting to a wider audience (e.g. review papers, book reviews, and notes) are welcome.