Large-scale toppling slope under water level fluctuation of reservoir:A case of Yunnan Province,China

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外文摘要：Landslides induced by reservoir inundation are common in Southwest China,negatively influencing hydropower stations.The Wunonglong hydropower station dam was constructed in the upper reaches of the Lancang River,accordingly causing the water level at the Lajinshengu slope to increase by 30 m.A tension crack with a visible depth of 8 m was observed in the upper sector of the Lajinshengu slope after reservoir impoundment for 170 d.In the following days,numerous cracks appeared on the surface of the slope,and the maximum displacement of the slope reached 3.22 m.Then,a large-scale active defor-mation body within the Lajinshengu slope formed with an area of 2.62 × 105 m2 and a volume of 1.65 × 107 m3.Detailed field investigations,on-site monitoring,and centrifugal model tests were carried out to analyze the surface features,deformation characteristics,and failure mechanism of the Lajin-shengu slope.The results show that the slope is an ancient landslide,divided into two parts(i.e.zone A and zone B)by the gully.Zone B is a traction landslide caused by the displacement of zone A.The long-term inundation weakens the soft rock at the slope foot,intensifying the toppling of bedrock and consequently triggering the sliding of the overburden in zone A.The failure mode of the Lajinshengu slope is a typical case of toppling-sliding failure,and the underlying rock toppling drives the overlying sliding.In addition,early identification methods for toppling deformation covered by overburdened soil were proposed based on monitoring data and deformation signs.

外文关键词：

Lajinshengu slopeReservoir impoundmentEarly identificationFailure mechanismToppling-sliding slope failure mode

作者：

Leilei Jin、Yufeng Wei、Fei Ye、Wenxi Fu、Jianfeng Liu、Shuwu Li

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作者单位：

State Key Laboratory of Hydraulic and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu,610065,China

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,610059,China

Northwest Engineering Corporation Limited,Xi'an,710065,China

基金：

National Nature Science Foundation of ChinaNational Nature Science Foundation of ChinaKey Research and Development Program of Sichuan Province,China

项目编号：

42072303421071722022YFN0023

出版年：

2024

DOI：

10.1016/j.jrmge.2023.09.019

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(8)