DIRECT SHEAR (MOTORISED SINGLE SPEED):

AS PER IS: 2720 (Part - Vlll), ASTM D- 3080.

Electrically operated to give a single constant rate of strain of 1.25 mm/min. Suitable for 230 V A.C.

Introduction:

• Information of Shear values plays an important role in the design of sub-structures in determining bearing capacity of soils, design of retaining walls, instability calculation of earth slopes etc.
• Various Shear Apparatus are available and Direct Shear Apparatus is one of them.
• In Direct Shear test specimen contained in a box is subjected to a constant normal load and increasing horizontal load is applied to the upper section of the specimen.
• Shear force and load are directly measured.
• For determination of the direct shear strength of soils on specimen size 60 mm x 60mm x 25 mm.
• Electrically operated to give a single constant rate of strain of 1.25 mm/min. Suitable for 230 V A.C.

General Description and Specifications:

• Loading Unit : with V strips on which shear box housing rests, load yoke with direct and lever system for applying normal load to the capacity of 8 kg/cm sq, fixture for proving ring, bracket for holding dial gauge, and electrically operated to give a single constant rate of strain of 1.25 mm/min. Suitable for 230 V A.C. Complicated counter balancing arrangement has been dispensed with and the unit is provided with pre-calibrated loading yoke.

• Shear Box Assembly for Square Specimen: Comprising Direct Shear box in two halves for a square specimen size 60 x 60 x 25 mm one pair of plain gripper plates, one pair of perforated gripper plates, one pair of porous stones, one top loading pad. Shear box housing: Accommodates the Direct Shear Box assembly.

• Shear Box Housing: Suitable to accommodates shear box assembly complete with two ball roller strips.

• Specimen Cutter: For cutting specimen size 60 x 60 x 25 mm obtained from field or from larger specimen.

• Set of Weights: To give normal stress of 3 kg/cm sq on specimen through lever as follows:
• 0.05 kg/cm² - 4 Nos.
• 0.1 kg/cm²   - 1 No.
• 0.2 kg/cm²   - 1 No.
• 0.5 kg/cm²   - 3 Nos.
• 1.0 kg/cm²   - 1 No.

• Proving Ring: High sensitivity compression Made of special alloy steel equipped proving Ring capacity 200 kg (2 KN) with dial gauge 0.01 mm x 25 mm.

Optional extras:

• Additional set of weights to give a normal stress of 5 kg/cm2.
• Soil Sampler for 60 mm x 60 mm specimen and test from pad of 50.
• Spares: Porous stone for 60 mm x 60 mm size sample available in pairs.