Target GATE & ESE 2022 (Geotechnical Engineering)

 Do You Know?

👉 In-Situ Shear modulus of soil can be calculated from Pressure-meter test.

👉 Soil Consistency                  N-Value

       Very Soft                               0-2                           

       Soft                                       3-4

      Firm                                       5-8

       Stiff                                      9-16

   Very Stiff                                 16-32

     Hard                                        >32

👉 Soil Description    Relative Density(%)    N-Value

      Very Loose               <15                                  <4

        Loose                     15-35                               4-10

Medium Dense              35-65                              10-30

   Dense                          65-85                             30-50

Very Dense                    >85                                    >50

👉  SPT: Suitable only for Cohesionless soil such as sandy soil

      DCPT: Dynamic cone penetration test is conducted by driving the cone by blows of a hammer. This is primarily used for cohesive soils but also applicable for medium to fine sand.

     SCPT: Static Cone penetration test is used for soil profiling. It also gives the value of end resistance and frictional resistance of sleeves.

👉Auger boring is most effective in soft soils which can stand unsupported and have some stickiness so that they do not fall back into hole during lifting operation.

👉Geophysical methods: They are non-destructive methods used in the construction industry for investigation of sub surface.

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