Lab Services: Soil testing
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Test Method Title
Standard Test Method for Torsional Ring Shear Test to Determine Drained Residual Shear Strength of Cohesive Soils
Shear stress, residual shear stress
Description of Test
This test method consists of placing the specimen in the annular specimen container, applying a predetermined normal stress through the top loading platen, providing for wetting and draining of the specimen (optional); consolidating the specimen under the normal stress; decreasing the normal stress to yield an overconsolidated specimen; preshearing the specimen by rotating the specimen container against the top loading platen for one revolution; applying a constant rate of shear deformation; and measuring the shearing force and displacement until a constant minimum resistance is reached.
Preferred Test Sample Size
Bulk samples: 1000 grams; undisturbed samples: 2.87" diameter x 3" of Shelby tube
Number of Test Specimens
Test Specimen Size
annular specimen; inside diameter ~2", outside diameter ~3.25"
consolidated; drained test conditions; Mohr-Coulomb strength envelope; reconstituted specimens; residual shear strength; ring-shear test