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The standard penetration test is useful to measure
- a)Consistency of clays
- b)Shear strength of soft clays
- c)Shear strength of sands
- d)Shear strength of stiff clay
Correct answer is option 'C'. Can you explain this answer?
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The standard penetration test is useful to measurea)Consistency of cla...
Shear Strength of Sands
The Standard Penetration Test (SPT) is a commonly used in-situ test in geotechnical engineering to determine the relative density of granular soils, such as sands. The test involves driving a standard sampler into the ground using a standard weight and dropping mechanism. The number of blows required for the sampler to penetrate the soil a certain depth (usually 12-18 inches) is recorded and known as the Standard Penetration Resistance (N-value).
Importance of SPT in determining shear strength of sands
- The SPT N-value is directly related to the density and shear strength of the soil. In sands, the N-value is used to estimate the relative density of the soil, which in turn is correlated with the shear strength of the soil.
- By analyzing the SPT results, engineers can determine the potential bearing capacity, settlement characteristics, and overall stability of structures founded on sandy soils.
- The SPT data can also be used to design foundations, retaining walls, and other geotechnical structures in sandy soils.
Conclusion
In conclusion, the Standard Penetration Test is a valuable tool for determining the shear strength of sands. By analyzing the SPT N-values, engineers can make informed decisions about the design and construction of structures on sandy soils.
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The standard penetration test is useful to measurea)Consistency of cla...
Standard Penetration Test (SPT):
- It is specially used for cohesionless soils. It is used to determine the relative density and the angle of shearing resistance of cohesionless soils.
- It can also be used to determine the unconfined compressive strength of cohesive soils.
- The standard penetration number is equal to the number of blows required for 300 mm of penetration beyond a seating drive of 150 mm.
- If the number of blows for 150 mm drive exceeds 50, it is taken as refusal and the test is discontinued.
- Hence the standard penetration test is useful to measure the angle of shearing resistance of cohesionless soils, i.e Shear strength of sands.
Important Points
Some of the other methods for in-situ site exploration are
Some of the other methods for in-situ site exploration are
- Pressure Meter Test (PMT)
- Static Cone Penetration Test (SCPT)
- Vane Shear Test (VST)
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