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Liquefaction Equations- Based on 20081driss & Boulanger EERI MNO-12: <br />SPT Correction factor for Energy ratio, CE ,Hammer Energy % / 60,example:70%/60 = 1.17 <br />Doughnut hammer CSB = 0.5-1.0 <br />CE _ ERnj Safety hammer CE = 0.7-1.2 <br />�" _ 60 Automatic triphammer CE = 0.5-1.3 <br />SPT Correction factor for Borehole Diameter, CB = If DIA. < 4.53 inch, =1.0, else = 1.15 <br />Borehole diameter of 65-115 mm CB e 1.0 <br />Borehole diameter of 150 mm CB = 1.05 <br />Borehole diameter of 200 mm CB = 1.15 <br />SPT Correction factor for Rod Length, CR= <br />Rod length < 1 in CR 0.75 <br />Rod length 3-4, in CB = 0.80 <br />Rod length 4-6 lei CR = 0.85 <br />Rod length -10 In CR = 0,95 <br />Rod len tli 10-30 ni CR = 1 00 <br />SPT Correction factor for Sampler, CS = <br />CS= 1.1 for <br />100 <br />Cs = 1.3 for <br />Corrected SPT, N60 =; <br />(NI )60 g 10 <br />for 1.0 < (Nl )(, j < 30 <br />(NI )60 �> 30 <br />Total Vertical Stress, Wit' = Gamma Sci x Depth E = Pore water Pressure <br />LiquefactionSPT Equations Page 1 of 4 <br />