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<p>The present study examines the impact of shear rate variation on the residual strength of tropical soil and its effect on landslide mobility. The Achanakkal and Madithorai sites were chosen for this study due to their impact from rainfall-induced landslides in November 2009 in the Nilgiris district, Tamil Nadu, India. The field and laboratory examinations, involving mineralogical and microstructural tests, were performed on the soils obtained from both landslide sites. A sequence of ring shear tests was performed at shear rates of 0.01, 0.1, and 1&#xa0;mm/min to examine the effects of slow to moderate shear rates on the residual strength. The findings indicated that Achanakkal soil showed a negative shear rate effect, but Madithorai soil showed a positive shear rate effect, attributed to differences in clay content, degree of aggregation, and degree of lateralization. Additionally, the impact of shear rate variation on landslide mobility was analyzed computationally employing the integrated Landslide Simulation model (LS-Rapid). The findings indicated that in the Achanakkal landslide, the runout distance increased from -30&#xa0;m to + 110&#xa0;m, whereas in the Madithorai landslide, it decreased from + 30&#xa0;m to -20&#xa0;m with an increasing shear rate. The findings demonstrate that the degree of lateralization is crucial in the tropical residual soils of the Madithorai and Achanakkal landslide sites, significantly affecting shear rate and landslide motion. This work demonstrates that combining numerical simulation with changes in shear rate can effectively predict landslide runout and aid in risk assessment.</p>

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Experimental and numerical study of shear rate effects on residual shear strength and landslide mobility

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Bhavithra Soundararajan,
  • Senthilkumar Vadivel

摘要

The present study examines the impact of shear rate variation on the residual strength of tropical soil and its effect on landslide mobility. The Achanakkal and Madithorai sites were chosen for this study due to their impact from rainfall-induced landslides in November 2009 in the Nilgiris district, Tamil Nadu, India. The field and laboratory examinations, involving mineralogical and microstructural tests, were performed on the soils obtained from both landslide sites. A sequence of ring shear tests was performed at shear rates of 0.01, 0.1, and 1 mm/min to examine the effects of slow to moderate shear rates on the residual strength. The findings indicated that Achanakkal soil showed a negative shear rate effect, but Madithorai soil showed a positive shear rate effect, attributed to differences in clay content, degree of aggregation, and degree of lateralization. Additionally, the impact of shear rate variation on landslide mobility was analyzed computationally employing the integrated Landslide Simulation model (LS-Rapid). The findings indicated that in the Achanakkal landslide, the runout distance increased from -30 m to + 110 m, whereas in the Madithorai landslide, it decreased from + 30 m to -20 m with an increasing shear rate. The findings demonstrate that the degree of lateralization is crucial in the tropical residual soils of the Madithorai and Achanakkal landslide sites, significantly affecting shear rate and landslide motion. This work demonstrates that combining numerical simulation with changes in shear rate can effectively predict landslide runout and aid in risk assessment.