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Procedure for the evaluation of soil liquefaction resistance (all soils) -Robertson (2010) <br />Calculation of soil resistance against liquefaction is performed according to the Robertson & Wride (1998) procedure. This <br />procedure used in the software, slightly differs from the one originally published in NCEER-97-0022 (Proceedings of the NCEER <br />Workshop on Evaluation of Liquefaction Resistance of Soils). The revised procedure is presented below in the form of a <br />nowcharti: <br />CPT <br />qI, 4, avo, 0';, p. = I atm <br />all same units as p. <br />Initial stress exponent: n = 1.0; Calculate (k Fr, [c <br />n = 0.381(4)+ 0.052--0.15lp.. <br />n 5 1.0 <br />Iterate until change in 4 An S 0.01 <br />. <br />.C <br />c.=lt <br />.L p.I•C F, <br />f. <br />• 100 <br />4 =b.47-togg* y +(22+log/:1):r <br />< 2.50 <llc < 2.70 h (4 2 2.70 1 <br />-Cj <br />If Ic s 1.64, Kc = 1.0 • <br />When 1.64 < Ic S 2.60 <br />Ke = 5.58I2 - 0.403 44 - 21.63 42 + 33.75Ic - 17.88) K <br />If 1.64 <4< 2.36 AND Fr < 0.594 set Kc = 1.0 <br />e =6*1 04(47.-70 <br />Qtn.cs = Kc •Q= , <br />1 <br />CRR <br />7-5 =93I- 1 + 0.08 <br />1000]CRR;, = 0,053QMK. 4- <br />50 5 Q„, 5 160 <br />1 P. K. Robertson, 2009. nPerformance based earthquake design using the CFT-, Keynote lecture, International Conference on <br />Performance-based Design in Earthquake Geotechnical Engineering - from case history to practice, IS-Tokyo, June 2009 <br />Cliq v.1.5.1.16 - CFT Uquefaction Assessment Software 50