Leading Supplier, exporter and Trader of Geotechnical Machine such as Soil Drilling Rig - Hydraulic Type, Standard Penetration Test Set, Core Drilling Rig - Calax Type, Dynamic Cone Penetration Test Set, Piezometer and Soil Bearing Capacity Test Equipment from Navi Mumbai.
The Standard Penetration Test, or SPT, is the most widely used in-situ test, in throughout the world, as an indicator of the density and compressibility of granular soils. It is also commonly used to check the consistency of stiff or stony cohesive soils and weak rocks. Estimation of the liquefaction potential of saturated granular soils for earthquake design is often based on these tests. Available design methods for both shallow and deep foundations rely heavily on SPT results.
• The test consists of driving a standard 50-mm outside diameter thick-walled sampler into soil at the bottom of a borehole, using repeated blows of a 63.5-kg hammer falling through 760 mm. The SPT N value is the number of blows required to achieve a penetration of 300 mm, after an initial seating drive of 150 mm.
• One of the advantages of the test is that it is carried out in routine exploration boreholes of varying diameters, so that (in contrast with other in-situ tests, such as the Cone Penetration Test) there is no need to bring special equipment to site.
Standard penetration test (SPT)
Evolution of SPT
Test methods and standards
Influence of ground conditions on penetration resistance
SPT energy measurement and corrections for SPT
Use of SPT results
• Soil classification
• Determination of geotechnical parameters
• Direct design uses
THE TOOL CONSISTS OF THREE COMPONENTS:
An inner stem connected at its an anvil ('drive-head' or 'striker plate') which screws directly to the drill rods. Current British anvils are large, weighing up to 20 kg.
A 140-lb cylindrical weight which has a small central hole allowing it to slide freely over the inner stem.
An outer tube assembly with pawls at its base. These pawls pick up the 140-lb weight and release it when the weight has been lifted 30-in above the upper surface of the striker plate.
The equipment consist of: