SPT – Standard Penetration Test

What is SPT or Standard Penetration Test?

  • ‘SPT or Standard Penetration Test a’ test in situ. In those cases, the problem is difficult to get sampled, in these cases, this test is very useful. With its help, the relative density of impermeable soils, the ability of shear resistance to be determined. With the help of this cohesive clay coarseness, the compressed stretch.

 What is the standard penalty number?

  • Standard Penetration Test or spt, when samples are collected, 450 millimeters of Hammer hits weighed 63-65 kg. The first 150 millimeters are not caught. For the next 300 millimeters, the number of hits is called the number of penetrations.

How to Test Penetration?

  • SPT
    Fig 1: Standard Penetration Test
  • This test was done in the deep depth of the borehole, After opening the drilling device at a specific depth, the Spillite Spoon Separator is reached to the bottom of the borehole at the edge of the sample pipes. After touching the bottom of the borehole of the sample, a drop of Hammer 750 mm from 63-65 kg in the upper end of the pipe is dropped 30 times in a minute. How many times do Hammer’s hits to reach 150 mm of Simpler either it is calculated. Thus, the number of hits for the next 150 mm and the next 150 mm depth was calculated. The hits for the first 150 mm are omitted and the number of hits for the next 300 mm depth is called the number of penetrations. If the hit number is more than 50 for a depth of 150 mm, then it is not acceptable and the exam is applicable. The position of the water level on the soil level, the size of the granularity, the stressed condition, the confirmation pressure, etc. affect the penitentiary resistance ‘N’. Therefore, the registration number of ‘NR‘ is required to be corrected. It is seen in the light of experience that generally two types of corrections are needed.STP1.Dilatancy correction

2.Overburden Correction

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