Standard penetration test during geotechnical survey
Geotechnical Investigation in General An important basis for the planning and construction of building and infrastructure projects comprising various types of structures as foundation, excavation pit, land reclamation, beach nourishment etc. For this purpose, the geotechnical investigation with its respective services shall be carried out. Their nature and extent depends on the type of the structure, the difficulty of the structure and the expected ground conditions. Disturbed samples can be derived from selected recovered cores of standard penetration tests SPT. For detailed guidance on the suitability of various soil sampling techniques in different types of soil, our geotechnical expert will provide professional advice.
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Standard Penetration Testing (SPT)
Standard Penetration Test
The standard penetration test SPT is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. This test is the most frequently used subsurface exploration drilling test performed worldwide. The test provides samples for identification purposes and provides a measure of penetration resistance which can be used for geotechnical design purposes. Many local and widely published international correlations which relate blow count, or N-value, to the engineering properties of soils are available for geotechnical engineering purposes. The test uses a thick-walled sample tube, with an outside diameter of This is driven into the ground at the bottom of a borehole by blows from a slide hammer with a mass of The sample tube is driven mm into the ground and then the number of blows needed for the tube to penetrate each mm 6 in up to a depth of mm 18 in is recorded.
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Standard penetration testing
The test is carried out within a borehole. The results can be used to determine the relative density, bearing capacity, and settlement of granular soil. The results can also be used to correlate the approximate strength of cohesive soil. In cohesive soil the test involves driving a 50mm diameter split-barrel spoon sample tube into the ground to recover a disturbed sample. In granular soil the split-barrel is replaced by a solid 60 degree cone.
The Standard Penetration Test SPT is one type of in-situ soil test and It is conducted to determine the geotechnical engineering properties of subsurface soils , especially for cohesionless soil. SPT Test is most widely used to check various parameters and properties of soil on the construction site. For any building foundation, design and construction soil testing are essential. The test is extremely useful for determining the bearing capacity, density, and angle of shearing resistance of any soil. It can be used to determine the properties of cohesive and cohesionless soil.
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