Describe about the correct N values classifications in Seismic-Induced Liquefaction.
Describe about the correct N values classifications in Seismic-Induced Liquefaction.
The type of soil mainly constituting the foundation are categorized into three types, namely
a) Type I - Rock or Hard Soil
b) Type II - Medium Soil
c) Type III - Soft Soil
For different types of soil foundation, the values of N differ as follows:
a) Type I - Rock or Hard Soil:
Well graded gravel and sand gravel and sand gravel mixtures with or without clay binder, and clayey sands poorly graded or sand clay mixtures (GB, CW, SB, SW, and SC) having N above 30, where N is the standard
penetration value.
b) Type II - Medium Soil:
All soils with N between 10 and 30, and poorly graded sands or gravelly sands with little or no fines (SP) with N>15 .
c) Type III - Soft Soil:
All soils other than SP with N<10.
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