Analysis of the causes of excessive leakage in the fractured rock masses of the Ludila hydropower station dam foundation

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Lifeng Wen, Yanlong Li
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Abstract

Seepage complications in fractured rock masses represent a significant concern in hydraulic engineering. This paper aims to investigate non-steady seepage behavior and determine the causes of excessive seepage rates in fractured rock masses containing complex seepage control systems in the Ludila hydropower station dam foundation. To achieve this goal, a novel analysis framework for seepage field in fractured rock masses with sophisticated seepage control systems was proposed. The seepage analysis framework was established by incorporating methods for determining permeability tensor, employing parabolic variational inequality approach which transforms the seepage problem within wet region into a boundary value problem for a fixed area, and utilizing drainage substructure technique. The numerical results closely agreed with empirical observations, which demonstrated effectiveness and suitability for seepage analysis in fractured rock masses with complex seepage control systems of the proposed framework. On this basis, transient seepage behavior and the factors contributing to the excessive seepage rates in the Ludila hydropower station dam foundation were investigated by combination of parametric numerical analysis and measured results. The results indicate that the grouting curtain is the main measure to control the seepage rate. A defective upstream curtain below a 60 m depth emerges as the primary cause for excessive seepage rates on the left bank of the Ludila hydropower station dam foundation. It is crucial to ensure construction quality and integrity of the grouting curtain, especially the bottom grouting curtain, in actual engineering.

鲁地拉水电站坝基裂隙岩体渗漏过大原因分析
裂隙岩体渗流复杂性是水利工程中一个重要的问题。本文旨在研究卢地拉水电站坝基含复杂渗流控制系统的裂隙岩体的非稳态渗流行为,确定渗流速率过大的原因。为实现这一目标,提出了一种具有复杂渗流控制系统的裂隙岩体渗流场分析框架。结合渗透率张量的确定方法,采用抛物变分不等式方法将湿区渗流问题转化为固定区域的边值问题,并利用排水子结构技术,建立了渗流分析框架。数值结果与经验观测结果吻合较好,证明了该框架在复杂渗流控制系统下裂隙岩体渗流分析的有效性和适用性。在此基础上,采用参数化数值分析与实测结果相结合的方法,研究了鲁地拉水电站坝基的瞬态渗流行为及其超渗影响因素。结果表明,帷幕灌浆是控制渗流的主要措施。卢地拉水电站坝基左岸渗水速率过大的主要原因是60 m以下的上游帷幕存在缺陷。在实际工程中,保证注浆帷幕,特别是底部注浆帷幕的施工质量和完整性至关重要。
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来源期刊
Bulletin of Engineering Geology and the Environment
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.
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