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<p>This study investigates the strength and dilatancy of tropical lateritic soil across a broad range of suction. Unsaturated tests on lateritic soil were conducted using the axis-translation and vapour-equilibrium techniques, with suction levels ranging from 0.05 to 149.5&#xa0;MPa. The results indicate that increasing suction changes the stress–strain curve from strain hardening to strain softening. Under constant confining stress, shear strength exhibits an increasing trend with increasing suction. The test results show a nonlinear increase in shear strength up to a maximum or critical suction, beyond which shear strength decreases. With increasing suction, the soil exhibited more brittle behaviour and greater dilatancy due to aggregate breakdown. An increase in confinement inhibits the dilation across the entire suction range, with maximum dilatancy observed at lower confining stresses. These results highlight the fundamental mechanical behaviour of unsaturated lateritic soil over a wide suction range, with notable increases in strength, stiffness, and dilatancy.</p>

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Unsaturated Strength and Dilatancy Behaviour of Tropical Lateritic Soil Over a Broad Range of Suction

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Bhavithra Soundararajan,
  • Senthilkumar Vadivel

摘要

This study investigates the strength and dilatancy of tropical lateritic soil across a broad range of suction. Unsaturated tests on lateritic soil were conducted using the axis-translation and vapour-equilibrium techniques, with suction levels ranging from 0.05 to 149.5 MPa. The results indicate that increasing suction changes the stress–strain curve from strain hardening to strain softening. Under constant confining stress, shear strength exhibits an increasing trend with increasing suction. The test results show a nonlinear increase in shear strength up to a maximum or critical suction, beyond which shear strength decreases. With increasing suction, the soil exhibited more brittle behaviour and greater dilatancy due to aggregate breakdown. An increase in confinement inhibits the dilation across the entire suction range, with maximum dilatancy observed at lower confining stresses. These results highlight the fundamental mechanical behaviour of unsaturated lateritic soil over a wide suction range, with notable increases in strength, stiffness, and dilatancy.