Describe the application of SPT and direct shear tests in estimating the bearing capacity of soil

Applications of  STP in estimating the bearing capacity of soil:

• Soil samples that are collected can be used for identifying the type of soil.
• SPT data can be used to establish the compressibility and relative strength index of the soil.
• Penetrate to dense layers, gravel, and tilt.
• With SPT-N values, the method can reflect actual soil behavior during earthquakes, that cannot be simulated in a lab.
• It is used especially for cohesionless soils.
• The relative density and the angle of cohesionless soils can be determined by using STP.
• The unconfined compressive strength of cohesive soil can be determined by using STP.

Applications of  direct shear in estimating the bearing capacity of soil:

• The drainage is quick and pore pressure dissipates fast as the thickness of the sample is small.
• Less amount too time is taken by Consolidated- undrained and drained tests.
• A direct shear test is ideal for drained tests on cohesionless soils.
• To measure shear strength properties of soil material or discontinuities in rock masses or soil.