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<p>The combined effects of confining pressure and water content on the high-rate behavior of compacted kaolin clay were investigated. The investigation was conducted in two consolidated undrained (CU) triaxial compression test series, the first of which explored the role of confining pressure for normally consolidated and overconsolidated clays having constant water contents, and the second explored the role of water content for normally consolidated clays under constant confinement. Confining pressures considered ranged between 35 and 280&#xa0;kPa, while water contents ranged between 28 and 36%. Both series considered a wide range of compression rates, ranging between 0.00762 and 762&#xa0;mm/s, corresponding to a strain rate range of 0.01–1000%/s. Both investigations revealed significant rate strengthening, rate stiffening, and a significant increase in strain at failure with increasing strain rate. Results of the confining pressure investigation indicate that rate effects are generally invariant to changes in confining pressure but show a slight dependence on consolidation pressure. The water content investigation indicated that rate effects are generally insensitive to variations in water content above the plastic limit. However, reduction in water content to below the plastic limit resulted in a dramatic (2–threefold) increase in strengthening and stiffening. The data collected from both investigations were used to calibrate both a semi-logarithmic and a power rate-hardening laws which are commonly employed in engineering practice. Calibration of these equations resulted in calibration coefficients for the semi-logarithmic and power rate-hardening laws (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\lambda\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>λ</mi> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\beta ,\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>β</mi> <mo>,</mo> </mrow> </math></EquationSource> </InlineEquation> respectively) ranging from 0.262–0.926 and 0.077–0.161, respectively.</p>

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Rheology of compacted kaolin clay under rapid loading

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Joseph Dinotte,
  • Abdelaziz Ads,
  • Mehdi Omidvar,
  • Stephen Bless,
  • Magued Iskander

摘要

The combined effects of confining pressure and water content on the high-rate behavior of compacted kaolin clay were investigated. The investigation was conducted in two consolidated undrained (CU) triaxial compression test series, the first of which explored the role of confining pressure for normally consolidated and overconsolidated clays having constant water contents, and the second explored the role of water content for normally consolidated clays under constant confinement. Confining pressures considered ranged between 35 and 280 kPa, while water contents ranged between 28 and 36%. Both series considered a wide range of compression rates, ranging between 0.00762 and 762 mm/s, corresponding to a strain rate range of 0.01–1000%/s. Both investigations revealed significant rate strengthening, rate stiffening, and a significant increase in strain at failure with increasing strain rate. Results of the confining pressure investigation indicate that rate effects are generally invariant to changes in confining pressure but show a slight dependence on consolidation pressure. The water content investigation indicated that rate effects are generally insensitive to variations in water content above the plastic limit. However, reduction in water content to below the plastic limit resulted in a dramatic (2–threefold) increase in strengthening and stiffening. The data collected from both investigations were used to calibrate both a semi-logarithmic and a power rate-hardening laws which are commonly employed in engineering practice. Calibration of these equations resulted in calibration coefficients for the semi-logarithmic and power rate-hardening laws ( \(\lambda\) λ and \(\beta ,\) β , respectively) ranging from 0.262–0.926 and 0.077–0.161, respectively.