Lugeon Test: New insights Into the Calculated Hydraulic Conductivity

IF 1.3 4区工程技术 Q3 ENGINEERING, GEOLOGICAL

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-06-13 DOI:10.1144/qjegh2023-006

M. Zoorabadi

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Abstract

While the Lugeon test was initially designed to aid in determining the grouting needs of dam foundations in fractured rock, its outcomes have been utilised by geotechnical engineers and hydrogeologists to estimate the hydraulic conductivity. Most of the practitioners use the long-established relation of 1 Lu ≈ 1 e − 7 m/s to calculate the hydraulic conductivity based on the determined Lugeon value. However, this relationship does not cover all the potential boundary conditions encountered in field conditions where the Lugeon test is applied and the consequences on the estimated hydraulic conductivity are poorly understood. This paper aims to address this issue by revisiting existing mathematical formulations to calculate the hydraulic conductivity from the Lugeon test under the various boundary conditions. The paper also examines how the flow conditions and length of test intervals impact the recorded Lu and hydraulic conductivity values. It was found that the long-stablished relationship of 1 Lu ≈ 1 e − 7 m/s and the equation presented in the commonly used reference of BS5930:2010 only present one of the potential boundary conditions for Lugeon test.

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Lugeon测试:计算水力导电性的新见解

虽然Lugeon试验最初的设计目的是帮助确定裂隙岩石中大坝基础的注浆需求，但其结果已被岩土工程师和水文地质学家用于估计水力导电性。大多数从业者使用长期建立的1 Lu≈1 e−7 m/s的关系，根据确定的Lugeon值计算水力导率。然而，这种关系并不能涵盖Lugeon测试现场遇到的所有潜在边界条件，而且对估计的水力导率的影响也知之甚少。本文旨在通过回顾现有的数学公式来计算各种边界条件下吕根试验的水力导率，从而解决这一问题。本文还研究了流动条件和测试间隔长度如何影响记录的Lu和水力导电性值。我们发现，建立已久的1 Lu≈1 e−7 m/s的关系式和常用参考文献BS5930:2010中给出的方程仅仅是吕金试验的一种潜在边界条件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Quarterly Journal of Engineering Geology and Hydrogeology 地学-地球科学综合

CiteScore

3.40

自引率

14.30%

发文量

审稿时长

6 months

期刊介绍： Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.