Numerical parametric study on the influence of location and inclination of large-scale asperities on the shear strength of concrete-rock interfaces of small buttress dams

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外文摘要：When assessing the sliding stability of a concrete dam,the influence of large-scale asperities in the sliding plane is often ignored due to limitations of the analytical rigid body assessment methods pro-vided by current dam assessment guidelines.However,these asperities can potentially improve the load capacity of a concrete dam in terms of sliding stability.Although their influence in a sliding plane has been thoroughly studied for direct shear,their influence under eccentric loading,as in the case of dams,is unknown.This paper presents the results of a parametric study that used finite element analysis(FEA)to investigate the influence of large-scale asperities on the load capacity of small buttress dams.By varying the inclination and location of an asperity located in the concrete-rock interface along with the strength of the rock foundation material,transitions between different failure modes and correlations between the load capacity and the varied parameters were observed.The results indicated that the inclination of the asperity had a significant impact on the failure mode.When the inclination was 30° and greater,interlocking occurred between the dam and foundation and the governing failure modes were either rupture of the dam body or asperity.When the asperity inclination was significant enough to provide interlocking,the load capacity of the dam was impacted by the strength of the rock in the foundation through influencing the load capacity of the asperity.The location of the asperity along the concrete-rock interface did not affect the failure mode,except for when the asperity was located at the toe of the dam,but had an influence on the load capacity when the failure occurred by rupture of the buttress or by sliding.By accounting for a single large-scale asperity in the concrete-rock interface of the analysed dam,a horizontal load capacity increase of 30％-160％was obtained,depending on the incli-nation and location of the asperity and the strength of the foundation material.

外文关键词：

Concrete damButtress damSlidingShear strengthConcrete-rock interfaceAsperity inclinationAsperity location

作者：

Dipen Bista、Adrian Ulfberg、Leif Lia、Jaime Gonzalez-Libreros、Fredrik Johansson、Gabriel Sas

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作者单位：

Sintef Narvik AS,8517,Narvik,Norway

Norwegian University of Science and Technology(NTNU),7491,Trondheim,Norway

Luleå University of Technology(LTU),97187,Luleå,Sweden

KTH Royal Institute of Technology,10044,Stockholm,Sweden

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基金：

various funding agencies:the Research Council of Norwayproject'Stable dams',FORMASproject'Improved safety assessment of concrete dams',and SVCproject'Safe dams'

项目编号：

2440292019-01236VKU32019

出版年：

2024

DOI：

10.1016/j.jrmge.2023.12.036

岩石力学与岩土工程学报(英文版)

中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD

影响因子：0.404

ISSN：1674-7755

年,卷(期)：2024.16(10)