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<p>This research shows the failure mechanism of the rainfall-induced Durtlang landslide in dipping shale beds, causing catastrophic damage to the BSUP housing complex in Aizawl, Mizoram, on 2nd July 2019. The attitude of the shale bed was ~28° towards N55°E. Intact shale samples were collected from the failed zone, and their physico-mechanical properties were tested under dry and wet conditions. The petrographic study revealed the presence of Quartz, Biotite, clay minerals, etc. The uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and point load index (PLI) indicated a 29.00%, 56.79%, and 33.61% decrease, respectively, in wet conditions when compared to dry. A thorough 10-year sum average rainfall and soil moisture analysis reveals a strong detrimental effect of rainfall and soil moisture on Durtlang’s slope failure. The slope was numerically simulated in a distinct element code under dry and wet conditions to understand the failure mechanism. The results showed that there was a 42.98%, 21.25% and 41.25% increase in total displacement, maximum velocity and maximum shear displacement, respectively, and 7.35% decrease of maximum unbalanced force in wet conditions, when compared to dry. A factor-of-safety (FoS) of 1.20 and 0.89 was obtained for the slope when simulated under dry and wet conditions, respectively. The kinematic analysis indicated a probability of a planar mode of failure. The study evaluated the critical parameters of the slope failure in the BSUP housing complex, which posed a significant threat to life and property while emphasizing the need for appropriate characterization of the slope prior to anthropogenic activities in hilly regions for human and infrastructural development.</p>

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Understanding the landslide trigger mechanism in gently dipping shale beds: A case study from Aizawl, Mizoram, India

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Debasish Mazumder,
  • Ratan Das,
  • Sourav Das,
  • T N Singh

摘要

This research shows the failure mechanism of the rainfall-induced Durtlang landslide in dipping shale beds, causing catastrophic damage to the BSUP housing complex in Aizawl, Mizoram, on 2nd July 2019. The attitude of the shale bed was ~28° towards N55°E. Intact shale samples were collected from the failed zone, and their physico-mechanical properties were tested under dry and wet conditions. The petrographic study revealed the presence of Quartz, Biotite, clay minerals, etc. The uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and point load index (PLI) indicated a 29.00%, 56.79%, and 33.61% decrease, respectively, in wet conditions when compared to dry. A thorough 10-year sum average rainfall and soil moisture analysis reveals a strong detrimental effect of rainfall and soil moisture on Durtlang’s slope failure. The slope was numerically simulated in a distinct element code under dry and wet conditions to understand the failure mechanism. The results showed that there was a 42.98%, 21.25% and 41.25% increase in total displacement, maximum velocity and maximum shear displacement, respectively, and 7.35% decrease of maximum unbalanced force in wet conditions, when compared to dry. A factor-of-safety (FoS) of 1.20 and 0.89 was obtained for the slope when simulated under dry and wet conditions, respectively. The kinematic analysis indicated a probability of a planar mode of failure. The study evaluated the critical parameters of the slope failure in the BSUP housing complex, which posed a significant threat to life and property while emphasizing the need for appropriate characterization of the slope prior to anthropogenic activities in hilly regions for human and infrastructural development.