首页|Subsurface multi-physical characterization of mountain excavation and city construction in loess plateau with a fiber-optic sensing system

Subsurface multi-physical characterization of mountain excavation and city construction in loess plateau with a fiber-optic sensing system

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Mountain excavation and city construction(MECC)projects being launched in the Loess Plateau in China involve the creation of large-scale artificial land.Understanding the subsurface evolution characteristics of the artificial land is essential,yet challenging.Here,we use an improved fiber-optic monitoring system for its subsurface multi-physical characterization.The system enables us to gather spatiotemporal dis-tribution of various parameters,including strata deformation,temperature,and moisture.Yan'an New District was selected as a case study to conduct refined in-situ monitoring through a 77 m-deep borehole and a 30 m-long trench.Findings reveal that the ground settlement involves both the deformation of the filling loess and the underlying intact loess.Notably,the filling loess exhibits a stronger creep capability compared to underlying intact loess.The deformation along the profile is unevenly distributed,with a positive correlation with soil moisture.Water accumulation has been observed at the interface between the filling loess and the underlying intact loess,leading to a significant deformation.Moreover,the temperature and moisture in the filling loess have reached a new equilibrium state,with their depths influenced by atmospheric conditions measuring at 31 m and 26 m,respectively.The refined investi-gation allows us to identify critical layers that matter the sustainable development of newly created urban areas,and provide improved insights into the evolution mechanisms of land creation.

Mountain excavation and city constructionFiber-optic monitoringMulti-physical characterizationCompacted loess

Jie Liu、Bin Shi、Kai Gu、Meng-Ya Sun、Jun-Cheng Yao、He-Ming Han

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

Frontiers Science Center for Critical Earth Material Cycling,Nanjing University,Nanjing,210023,China

School of Earth Sciences and Engineering,Hohai University,Nanjing,210098,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Research & Development Program of Shaanxi Province

4203070419772172020ZDLSF06-03

2024

10.1016/j.jrmge.2023.09.026

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)
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