Premium Direct Shear Apparatus 2kN Single Speed
VSLIC-S132
Copyright @2023 Vertex Group
Copyright @2023 Vertex Group
short info
The unit confirms to IS:2720. It has a hand operated horizontal loading system for shearing the specimen. Hangers are provided for creating normal stress. Set of weights to give a normal stress upto 3 kg/cm² through lever, comprising 4 of 0.05 kg/cm², 1 of 0.1 kg/cm², 1 of 0.2 kg/cm², 3 of 0.5 kg/cm² and 1 of 1 kg/cm². Complete as above but without dial gauges and proving ring.
Standard
IS 2720 (PART 13), BS1377, ASTM D3080
Model
VSLIC-S132
Origin
Indian
Make/ OEM
VERTEX
Warranty
This Warranty covers the defects resulting from defective parts, materials or manufacturing, if such defects are revealed during the period of 12 months since the date of purchase.
Picture
All pictures shown are for illustration purpose only. actual product may vary due to product enhancement.
The unit confirms to IS:2720. It has a hand operated horizontal loading system for shearing the specimen. Hangers are provided for creating normal stress.
It comprises :-
Shear box assembly, 60 mm square, complete with a U-bracket, guide pins and spacing screws, made of brass.
Gripper assembly consisting of two plain grid plates, two perforated grid plates, one base plate and one loading pad, all made of brass.
Two porous stones, each 6 mm thick, fitting the shear box.
Shear box housing of brass, complete with two ball roller strips.
Loading unit with normal loading of 8 kg/cm² on 60 mm square specimen.
Specimen cutter for a specimen size of 60 mm x 60 mm x 25 mm.
Set of weights to give a normal stress upto 3 kg/cm² through lever, comprising 4 of 0.05 kg/cm², 1 of 0.1 kg/cm², 1 of 0.2 kg/cm², 3 of 0.5 kg/cm² and 1 of 1 kg/cm². Complete as above but without dial gauges and proving ring.
Shear Box Housing:
Accommodates the direct shear box assembly.
Complete with two ball roller strips.
Specimen cutter: for cutting 60 x 60 x 25 mm.
Specimen form larger samples. Set of weights to give a normal stress of 3kg/sa.cm. Through larger as following :
The unit confirms to IS:2720. It has a hand operated horizontal loading system for shearing the specimen. Hangers are provided for creating normal stress.
It comprises :-
Shear box assembly, 60 mm square, complete with a U-bracket, guide pins and spacing screws, made of brass.
Gripper assembly consisting of two plain grid plates, two perforated grid plates, one base plate and one loading pad, all made of brass.
Two porous stones, each 6 mm thick, fitting the shear box.
Shear box housing of brass, complete with two ball roller strips.
Loading unit with normal loading of 8 kg/cm² on 60 mm square specimen.
Specimen cutter for a specimen size of 60 mm x 60 mm x 25 mm.
Set of weights to give a normal stress upto 3 kg/cm² through lever, comprising 4 of 0.05 kg/cm², 1 of 0.1 kg/cm², 1 of 0.2 kg/cm², 3 of 0.5 kg/cm² and 1 of 1 kg/cm². Complete as above but without dial gauges and proving ring.
FEATURES
The unit confirms to IS:2720. It has a hand operated horizontal loading system for shearing the specimen. Hangers are provided for creating normal stress.
It comprises :-
Shear box assembly, 60 mm square, complete with a U-bracket, guide pins and spacing screws, made of brass.
Gripper assembly consisting of two plain grid plates, two perforated grid plates, one base plate and one loading pad, all made of brass.
Two porous stones, each 6 mm thick, fitting the shear box.
Shear box housing of brass, complete with two ball roller strips.
Loading unit with normal loading of 8 kg/cm² on 60 mm square specimen.
Specimen cutter for a specimen size of 60 mm x 60 mm x 25 mm.
Set of weights to give a normal stress upto 3 kg/cm² through lever, comprising 4 of 0.05 kg/cm², 1 of 0.1 kg/cm², 1 of 0.2 kg/cm², 3 of 0.5 kg/cm² and 1 of 1 kg/cm². Complete as above but without dial gauges and proving ring.
PRODUCT VIDEO
WORKING PRINCIPALNew
Shear Strength of Soil by Direct Shear Test
Shear strength of a soil is its maximum resistance to shearing stresses. The shear strength is expressed as
Where C’ = Effective cohesion
= Effective stress = Effective angle of shearing resistance
Using direct shear test, one can find out the cohesion and angle of internal friction of soil which are useful in many engineering designs such as foundations, retaining walls, etc.
This test can be performed in three different drainage conditions namely unconsolidated-undrained, consolidated-undrained and consolidated-drained conditions. In general, cohesionless soils are tested for direct shear in consolidated drained condition.
Apparatus Required for Direct Shear Test
Apparatus required for conduction direct shear test are
Shear box
Shear box container
Base plate with cross groves on its top
Porous stones (2 Nos)
Plain Grid plates (2Nos)
Perforated grid plates (2Nos)
Loading pad with steel ball
Digital weighing machine
Loading frame with loading yoke
Proving ring
Dial gauges (2 Nos)
Weights
Tampering Rod
Spatula
Rammer
Sampler
Fig 1: Direct Shear Test Apparatus
Test Procedure of Direct Shear Test
Test Procedure of Direct shear test contains following steps:
Collect the soil specimen which is either undisturbed or remolded. The sample should be taken using sampler and Rammer. If cohesionless soil is taking then sampler and rammer are not required.
The inner dimensions of sampler should be 60 mm x 60 mm in plan which are also the inner dimensions of shear box. The Thickness of box is about 50 mm while the thickness of sample should be 25mm.Fig 2: Shear Box,Porous Stones, Grid Plates, Loading pad
Now attach the two halves of the shear box with locking pins and place the base plate at the bottom.
Above the bottom plate, Place the porous stone and above it place the grid plate. Plain grid plates are used for undrained conditions while perforated grid plates are used for drained conditions.
Now we have baseplate, porous stone and grid plate in the shear box. Weigh the box at this stage and note down.
After that place the soil specimen above the grid plate. Undisturbed sample is directly transferred to shear box. If sandy soil is using, place it layers wise and tamper the each layer to get the required density.
Note down the weight of shear box with soil specimen.
Above the soil specimen, place the upper grid plate, porous stone and loading pad one above the other.Fig 3: Different Layers Positions in Shear Box
Now the whole box is placed in a container and mounted on the loading frame.
Proving ring is arranged in such a way that it should contact the upper half of the shear box.
Loading yoke is placed on the steel ball of loading pad of shear box.
Two dial gauges are fitted one to the container for measuring shear displacement and other one is to the loading yoke for measuring vertical displacement.
Now locking pins are removed from the shear box and spacing screws are placed in their respective positions of the box.Fig 4: Applying Load on Specimen
The upper half of the box is raised slightly with the help of spacing screws. The spacing is decided depending upon the maximum size of particle.
Now apply the normal stress which is generally 25 kN/m2. Also apply the shear load at a constant rate of strain.
Now the box starts reacting to loads applied and for every 30 seconds note down the readings of proving ring and dial gauges.
If the proving ring reaches maximum and suddenly drops it, means the specimen is failed. Note down the maximum value which is nothing but failure stress.
For some soils, failure point is taken at 20% of shear strain.
Finally remove the box and measure the water content of the specimen.
Repeat the same procedure for different normal stresses of 50, 100, 150,200,250,300,400 kN/m2
Observations and Calculations for Direct Shear Test
Calculations are to be done using the observations taken from the test as follows:
Size of the box =
Area of the box =
Thickness of specimen =
Mass of specimen =
Volume of specimen =
Bulk Density of soil =
Dry density of soil =
Void ratio =
Mass of box + base plate + porous stone + grid plate =
Mass of box + base plate + porous stone + grid plate + Soil specimen =
Calculate the shear stress using below tabulated observations:
S.No
Elapsed time
Horizontal dial gauge reading
Horizontal displacement
Vertical dial gauge reading
Vertical displacement
Proving ring reading
Shear force
Shear stress
Now determine the shear stress at failure for different normal stress values:
Test no.
Normal stress(kN/m2)
Shear Stress at Failure (kN/m2)
Shear Displacement at Failure
Initial Water Content
Final Water Content
Now plot a graph between normal stress and shear stress by taking normal stress on abscissa and shear stress at failure on ordinate. The graph looks like as shown below.
Fig 5: Graph plotted between Normal Stress and Shear stress
From the graph cohesion intercept (c’) and angle of shearing resistance () can be known and shear strength (s) can be calculated from the formula.
Result of Direct Shear Test
Shear strength of the given soil sample is = ______________ kN/m2.
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