The in-situ test specifically designed to determine the undrained shear strength of soft, saturated clays is the Field Vane Shear Test, often referred to simply as the Vane Shear Test. Undrained shear strength, denoted as 'cu', represents the maximum shear stress a soil can withstand before failure without any change in its water content or pore water pressure, a critical condition for saturated clays under rapid loading. "In-situ" means the test is performed directly in the ground at the si....
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