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<p>Varved clays are sedimentary deposits specifically found in glaciated regions with distinct couplets having alternate layers of silt and clay. Through a series of direct shear tests, this study investigates the shear strength behavior reconstituted varved clay couplets samples under varying normal stresses, shearing displacement rates and moisture conditions with various percentages of optimum moisture content. The results reveal that shear strength parameters and the peak shear stresses at failure under different normal stresses are significantly affected by moisture conditions and displacement rates. With the decrease in displacement rate from 1.25 to 0.24&#xa0;mm/min, the shear strength parameters were found to increase by 1.2–2.8 times of their former value. Further, as the shearing rate increased to 0.024&#xa0;mm/min, the friction angle and cohesion increased by 2.5–8.0 times with respect to the values obtained from 0.24&#xa0;mm/min. It is illustrated that the increase in cohesion is more sensitive to the changes in displacement rate. For all displacement rates, the maximum angle of internal friction and cohesion in the reconstituted varve couplet is achieved at both drier and wetter moisture conditions, relative to the peak values of internal friction and cohesion in homogeneous soil samples. The importance of this study lies in assessing the response of glaciated varved soils under varying stress conditions caused by glacier accumulation and subjected to varying velocity of glacial movement. Such studies aid in reliable understanding various geotechnical issues in cold glaciated regions including slope stability design and infrastructure development projects including mitigation structures.</p>

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Impact of Displacement Rate on Direct Shear Strength Characteristics of Reconstituted Varved Couplets with Varying Moisture Content

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Deepali Anand,
  • Arindam Dey,
  • K. Ravi

摘要

Varved clays are sedimentary deposits specifically found in glaciated regions with distinct couplets having alternate layers of silt and clay. Through a series of direct shear tests, this study investigates the shear strength behavior reconstituted varved clay couplets samples under varying normal stresses, shearing displacement rates and moisture conditions with various percentages of optimum moisture content. The results reveal that shear strength parameters and the peak shear stresses at failure under different normal stresses are significantly affected by moisture conditions and displacement rates. With the decrease in displacement rate from 1.25 to 0.24 mm/min, the shear strength parameters were found to increase by 1.2–2.8 times of their former value. Further, as the shearing rate increased to 0.024 mm/min, the friction angle and cohesion increased by 2.5–8.0 times with respect to the values obtained from 0.24 mm/min. It is illustrated that the increase in cohesion is more sensitive to the changes in displacement rate. For all displacement rates, the maximum angle of internal friction and cohesion in the reconstituted varve couplet is achieved at both drier and wetter moisture conditions, relative to the peak values of internal friction and cohesion in homogeneous soil samples. The importance of this study lies in assessing the response of glaciated varved soils under varying stress conditions caused by glacier accumulation and subjected to varying velocity of glacial movement. Such studies aid in reliable understanding various geotechnical issues in cold glaciated regions including slope stability design and infrastructure development projects including mitigation structures.