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<p>The present work is focused on investigating the influence of effective confining stress on the undrained strength behaviour of cement-rich clay mixes applicable to deep mixing techniques. In this paper, consolidated undrained triaxial tests are conducted to evaluate the peak deviator stress and secant modulus under varying effective confining stresses (50–200&#xa0;kPa), curing (7&#xa0;days and 28&#xa0;days), and cement-contents (10–50%). The test outcomes show that the peak deviator stress increase with the increase in effective confining stress; the influence of effective confining stress above 100&#xa0;kPa, however, became less substantial for higher cement-contents (e.g., 40% and 50%). This effect further diminish with the curing time. The effective friction angle found to increase with the cement-content up to 30%, while the values reduced on further addition of cement. In contrast, values of effective cohesion increase monotonically with an increase in cement-content from 10% to 50%. Scanning electron microscopy images confirm the progressive filling of inter-cluster pores caused by cementation; however, less fabric changes were seen for cement-contents higher than 30%. Linear relationships are observed between peak deviator stress and cement-content, and peak deviator stress and effective confining stress. Furthermore, equations are proposed using multiple linear regression for predicting the peak deviator stress by considering the appropriate combinations of influential parameters. This research provides insight towards understanding the relationships of peak deviator stress and secant modulus with effective confining stress, cement-content, and curing times of cement-rich clay mixes relevant to deep mixing techniques.</p>

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Effect of Confining Stress on Cement-Rich Clays Subjected to Undrained Shearing

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Murapaka Swamynaidu,
  • Akanksha Tyagi

摘要

The present work is focused on investigating the influence of effective confining stress on the undrained strength behaviour of cement-rich clay mixes applicable to deep mixing techniques. In this paper, consolidated undrained triaxial tests are conducted to evaluate the peak deviator stress and secant modulus under varying effective confining stresses (50–200 kPa), curing (7 days and 28 days), and cement-contents (10–50%). The test outcomes show that the peak deviator stress increase with the increase in effective confining stress; the influence of effective confining stress above 100 kPa, however, became less substantial for higher cement-contents (e.g., 40% and 50%). This effect further diminish with the curing time. The effective friction angle found to increase with the cement-content up to 30%, while the values reduced on further addition of cement. In contrast, values of effective cohesion increase monotonically with an increase in cement-content from 10% to 50%. Scanning electron microscopy images confirm the progressive filling of inter-cluster pores caused by cementation; however, less fabric changes were seen for cement-contents higher than 30%. Linear relationships are observed between peak deviator stress and cement-content, and peak deviator stress and effective confining stress. Furthermore, equations are proposed using multiple linear regression for predicting the peak deviator stress by considering the appropriate combinations of influential parameters. This research provides insight towards understanding the relationships of peak deviator stress and secant modulus with effective confining stress, cement-content, and curing times of cement-rich clay mixes relevant to deep mixing techniques.