首页|Thermo-hydro-poro-mechanical responses of a reservoir-induced landslide tracked by high-resolution fiber optic sensing nerves

Thermo-hydro-poro-mechanical responses of a reservoir-induced landslide tracked by high-resolution fiber optic sensing nerves

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Thermo-poro-mechanical responses along sliding zone/surface have been extensively studied.However,it has not been recognized that the potential contribution of other crucial engineering geological in-terfaces beyond the slip surface to progressive failure.Here,we aim to investigate the subsurface multi-physics of reservoir landslides under two extreme hydrologic conditions(i.e.wet and dry),particularly within sliding masses.Based on ultra-weak fiber Bragg grating(UWFBG)technology,we employ special-purpose fiber optic sensing cables that can be implanted into boreholes as"nerves of the Earth"to collect data on soil temperature,water content,pore water pressure,and strain.The Xinpu landslide in the middle reach of the Three Gorges Reservoir Area in China was selected as a case study to establish a paradigm for in situ thermo-hydro-poro-mechanical monitoring.These UWFBG-based sensing cables were vertically buried in a 31 m-deep borehole at the foot of the landslide,with a resolution of 1 m except for the pressure sensor.We reported field measurements covering the period 2021 and 2022 and produced the spatiotemporal profiles throughout the borehole.Results show that wet years are more likely to motivate landslide motions than dry years.The annual thermally active layer of the landslide has a critical depth of roughly 9 m and might move downward in warmer years.The dynamic groundwater table is located at depths of 9-15 m,where the peaked strain undergoes a periodical response of leap and withdrawal to annual hydrometeorological cycles.These interface behaviors may support the interpretation of the contribution of reservoir regulation to slope stability,allowing us to correlate them to local damage events and potential global destabilization.This paper also offers a natural framework for interpreting thermo-hydro-poro-mechanical signatures from creeping reservoir bank slopes,which may form the basis for a landslide monitoring and early warning system.

Reservoir landslideThermo-hydro-poro-mechanical responseUltra-weak fiber bragg grating(UWFBG)subsurface evolutionEngineering geological interfaceGeotechnical monitoring

Xiao Ye、Hong-Hu Zhu、Gang Cheng、Hua-Fu Pei、Bin Shi、Luca Schenato、Alessandro Pasuto

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School of Earth Sciences and Engineering,Nanjing University,Nanjing,210023,China

School of Computer Science,North China Institute of Science and Technology(National Safety Training Center of Coal Mines),Beijing,101601,China

State Key Lab of Coastal and Offshore Engineering,Department of Geotechnical Engineering,Dalian University of Technology,Dalian,116024,China

National Research Council-Research Institute for Geo-Hydrological Protection(CNR-IRPI),Padova,35127,Italy

Department of Information Engineering,University of Padova,Padova,35131,Italy

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National Science Fund for Distinguished Young Scholars of National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaInstitute of Exploration Technology,China Geological Survey,Chengdu

4222570242077235

2024

10.1016/j.jrmge.2023.04.004

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(3)
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