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Soft and sensitive soils whose shear strength is less than 15 KN/m2, the results are dependent on operator's skill. Even pushing the sample tubes in soil may cause some disturbance. Experience shows that carefully controlled compression test results can be related to figures obtained by pushing a small vane in the soil and rotating it at a controlled rate and measuring the force, required for maximum resistance. Vane Shear Test can be conducted in a laboratory or in the field.
Laboratory Vane Shear (Motorised)
In Situ Vane Shear Test
The apparatus is designed for conducting in situ vane shear test from bottom of a bore hole in saturated cohesive deposits for determining their in place shearing resistance. Specifications: The equipment consists of a torque applicator assembly mounted on a base. A gear wheel, which is marked in degrees, holds a torque ring and is geared to a crank. The torque ring is a split ring and deforms as torque is applied and the deformation is indicated by a dial guage. A calibration Chart to convert dial gauge readings to torque force in kg.cm. is supplied. A pointer is provided for registering the rotation of the vane. A detachbale stand is provided to anchor the instrument. An attachment to security hold the string of rods is provided. The equipment comprises of the following: Torque applicator assembly capacity 2000Kg. cm. with split proving ring and dial gauge 0.002mm X 5mm complete with stand. Vane (with vane rod) 37.5mm dia X 75mm high 1 No. Vane (with vane rod) 50mm dia X 100mm high 1 No. Torque rod (Square Cross section) 0.6mtr. Long 1 No. Rods, quicks coupling type, 1mtr. long 25 Nos. Rods, quicks coupling type, 1/2mtr. long 10 Nos. Dummy rod, corresponding to 37.5mm dia vane 1 No. Dummy rod, corresponding to 50mm dia vane 1 No.