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Characteristics of failure area and failure mechanism of a bedding rockslide in Libo County, Guizhou, China

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Abstract

Owing to the continuous rainfall, a bedding rockslide occurred at a construction site on the San-Li highway (Sandu County to Libo County) at 18:05 (UTC+8) on September 23, 2017, in Libo County, Guizhou Province, China. This bedding rockslide caused three deaths, six injuries, and an accumulation zone of approximately 1.8 × 105 m3 of medium weathered limestone that blocked the main line of the M ramp. To explore the triggering factors of this rockslide, the engineering geological condition, hydrogeological condition, slope excavation scheme, and statistics of rainfall data were investigated based on field investigations and geophysical drilling. The blasting failure of the upper unstable and dangerous rock masses after the bedding rockslide was analyzed. Three instability behaviors characteristics are distinguished: (1) the bedding characteristics of the rock formation and weak interlayer, (2) the steep slope (the largest dip angle being 46°), and (3) the appearance of the free face induced by the slope excavation. The results indicate that the above conditions are objective factors, and continuous rainfall triggers the bedding rockslide. The landslide follows the step-path failure mode.

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Funding

This study was financially supported by the National Natural Science Foundation of China (Nos. 51478477 and 51878668), the Guizhou Provincial Department of Transportation Foundation (Nos. 2014122006 and 2017122058), the program of China Scholarship Council, and the Fundamental Research Funds for the Central Universities of Central South University (No. 2017zzts199). All financial supports are greatly appreciated.

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, Hunan, China

    Lianheng Zhao, Dejian Li, Xiao Cheng & Shi Zuo

  2. Key Laboratory of Heavy-Haul Railway Engineering Structure, Ministry of Education, Central South University, Changsha, 410075, Hunan, China

    Lianheng Zhao

  3. Faculty of Arts and Science, Kyushu University, Fukuoka, 8190395, Japan

    Dejian Li & Xiao Cheng

  4. Guizhou Province Quality and Safety Traffic Engineering Monitoring and Inspection Center Co., Ltd., Guiyang, 550081, Guizhou, China

    Hanhua Tan

Authors
  1. Lianheng Zhao
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  2. Dejian Li
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  3. Hanhua Tan
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  4. Xiao Cheng
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  5. Shi Zuo
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Corresponding authors

Correspondence to Dejian Li or Shi Zuo.

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Zhao, L., Li, D., Tan, H. et al. Characteristics of failure area and failure mechanism of a bedding rockslide in Libo County, Guizhou, China. Landslides 16, 1367–1374 (2019). https://doi.org/10.1007/s10346-019-01188-6

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  • DOI: https://doi.org/10.1007/s10346-019-01188-6

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