Direct Shear

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Direct Shear Specification

Core Components
Shear Box Assembly, Loading Frame, Proving Ring, Dial Gauges

Measurement Range
Up to 2 kN

Frequency
50 Hz

Accuracy
100 %

Automation Grade
Semi-Automatic

Capacity
Normal Capacity: 2 kN (200 kgf)

Model No
DSS/200/ANL

Feature
Highly Efficient

Voltage
220 V AC

Power Source
Electric (Motorized)

Temperature Range
Ambient

Equipment Materials
Mild Steel/SS/Brass Components

Type
Direct Shear Apparatus

Usage
Laboratory

Display Type
Analog Dial Gauge

Dimension (L*W*H)
500 mm x 450 mm x 600 mm

Weight
Approx. 65 kg

About Direct Shear

Direct Shear Motorized Twelve Speed

The apparatus comprises of the following.

Loading Unit

Supplied with load yoke with direct and lever system for applying load. Normal stress capacity 8 kg/sq. cm. Load is applied either directly or through a counter balanced detachable lever. Provision is made for the load to be applied either through a steel ball recessed in the loading pad or direct through a boss on the pre calibrated loading yoke. The loading unit is provided with V strips and roller strips for frictionless movement of shear box housing.

Shear Box Assembly

Comprising direct shear box in two halves for a square specimen size 60 x 60 x 25mm one pair of plain gripper plates, One pair of perforated gripper plates, one pair of porous stones, one top of loading pad.

Shear Box Housing

Accommodates the direct shear box assembly. Complete with two ball roller strips. Specimen cutter : for cutting 60 x 60 x 25mm. Specimen form larger samples. Set of weights to give a normal stress of 3kg/sa.cm. Through larger as following : -

To give kg/cm. 0.05,Qty. 4 nos.To give kg/cm. 0.1,Qty. 1 no.To give kg/cm. 0.2,Qty. 1 no.To give kg/cm. 0.5,Qty. 3 nos.To give kg/cm. 1.0,Qty. 1 no. Complete set as above but without proving ring. Net weight 140 kg.

Essential Aceessories

High sensitivity compression proving ring. Cap 200kg. One consolidation dial gauge 0.01mm x 25mm and one strain dial gauge 0.01mm x 25mm

Optional Extras

2 Additional set of weights to give a normal stress of 5 kg/cm . Soil sampler for 60mm x 60mm specimen and test forms pad of 50. SPARES : Porous stone for 60mm x 60mm size sample available in pairs. Unit is electrically operated to give the following 12 rates or strains. 1.25, 0.625, 0.25, 0.125, 0.05, 0.025, 0.01, 0.005, 0.002, 0.001, 0.004 and 0.0002 mm/min. The apparatus is suitable for operation on 230 Volts Single Phase A.C. Supply.

Highly Efficient Laboratory Soil Testing

Designed for academic and industrial labs, the Direct Shear Apparatus provides reliable soil shear strength data. Its semi-automatic motor drive allows controlled and variable strain rates up to 1.25 mm/min, improving test consistency and reproducibility. The large horizontal displacement range and mechanical screw jack loading ensure versatility for various soil types and loads. Each accessory facilitates streamlined sample preparation and testing.

Precision and Compliance Guaranteed

This apparatus meets IS: 2720 (Part XIII) standards, ensuring test results align with recognized protocols. Analog dial-gauge displays deliver accurate and immediate measurements, while a standard 2 kN proving ring measures force with exactness. Chrome-plated and powder-coated parts minimize wear, maintaining calibration and performance over extensive use.

FAQs of Direct Shear :

Q: How is the Direct Shear Apparatus used to determine the shear strength of a soil sample?

A: The apparatus evaluates a soil samples shear strength by placing it within the shear box, then applying a controlled horizontal load using a motorized mechanism. The rate of strain, adjustable to 1.25 mm/min, enables precise displacement until failure, as measured by the analog dial gauge and proving ring.

Q: What accessories are included with the Direct Shear Apparatus?

A: Included are a set of weights, porous stones, grid plates, base plate, and a loading pad. These accessories ensure comprehensive sample preparation and proper load distribution during testing, enhancing the accuracy of each measurement.

Q: When should this equipment be used in soil testing?

A: It should be used when accurate assessment of soil shear strength is required, commonly for geotechnical investigations, foundation design, slope stability studies, and pavement construction analyses in laboratory settings.

Q: Where can the Direct Shear Apparatus be installed for operation?

A: The equipment is intended for laboratory use, requiring a stable workbench and access to a 220 V AC electrical outlet. Its dimensions (500 mm x 450 mm x 600 mm) and compact footprint suit most geotechnical labs.

Q: What is the process of conducting a test with this shear box system?

A: First, prepare the soil sample and assemble it in the shear box. Attach all accessories, set the required load and strain rate on the motor drive, and initiate the test. The mechanical screw jack applies force while dial gauges record displacement, with data collected until the sample shears.

Q: What benefits does motorized semi-automatic operation provide?

A: Motorized operation allows precise control over strain rates and loading, improving repeatability and reducing operator errors. Semi-automation streamlines the testing process and enables consistent data acquisition across multiple samples.

Q: How does the apparatus comply with relevant standards and ensure accuracy?

A: The Direct Shear Apparatus is designed according to IS: 2720 (Part XIII) standards, ensuring high-quality test results that meet industry benchmarks. The 100% accuracy is supported by its analog measurement system and robust materials, verified under ambient laboratory conditions.

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