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Shear deformation calculation of landslide using distributed strain sensing technology considering the coupling effect

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Abstract

Deformation monitoring is of great significance in understanding the evolution process of landslides and evaluating their stability conditions. Distributed strain sensing (DSS) technology, with obvious advantages of long measuring distance and excellent long-term performance, has become a widely accepted method in landslide monitoring. Nonetheless, when monitoring the subsurface shear deformation of a landslide based on DSS technology, two significant challenges remain unresolved. First, the coupling behavior between the borehole-installed DSS cable and the surrounding soil is unclear. Second, how to convert the strains exerted on the DSS cable into shear displacements remains elusive. To address these issues, this study investigates the coupling deformation mechanism between the DSS cable and surrounding soil under both low and high confining pressures, and develops corresponding soil-cable coupling criteria. Subsequently, a novel strain–displacement conversion model, namely the accumulative integral method (AIM), is proposed based on the geometric configuration of the DSS cable during soil shearing. The proposed method is verified against laboratory shear test results and field monitoring data, yielding results that not only confirm the reliability of the soil-cable coupling criteria, but also demonstrate the superiority of the proposed AIM over other methods in terms of accuracy .

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Funding

This study is financially supported provided by the National Natural Science Foundation of China (Grant Nos. 42120104002, 42225702, and 42077235), the State Key Laboratory of Hydroscience and Hydraulic Engineering (No. 2021-KY-04), and the fellowship of China Postdoctoral Science Foundation (Grant No. 2021M701841).

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Authors and Affiliations

  1. School of Water Resources and Environment, China University of Geosciences, Beijing, 100084, China

    Lei Zhang

  2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China

    Lei Zhang & Yifei Cui

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

    Lei Zhang, Honghu Zhu, Han Wu, Heming Han & Bin Shi

  4. Key Laboratory of High-Speed Railway Engineering, MOE/School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Yan Yan

Authors
  1. Lei Zhang
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  2. Yifei Cui
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  3. Honghu Zhu
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  4. Han Wu
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  5. Heming Han
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  6. Yan Yan
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  7. Bin Shi
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Correspondence to Honghu Zhu.

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Zhang, L., Cui, Y., Zhu, H. et al. Shear deformation calculation of landslide using distributed strain sensing technology considering the coupling effect. Landslides 20, 1583–1597 (2023). https://doi.org/10.1007/s10346-023-02051-5

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