Soil liquefaction : a critical state approach Soil Liquefaction has become widely cited. It is built on the principle that liquefaction can and must be understood from mechanics. This second edition is developed from this premise in three respects: with the inclusion of silts and sandy silts commonly encountered as mine tailings by an extensive treatment of cyclic mobility and the cyclic simple shear test and through coverage from the element scale seen in laboratory testing to the evaluation of boundary value problems of civil and mining engineering. As a mechanics based approach is necessarily numerical detailed derivations are provided for downloadable open code software (in both Excel VBA and C) including code verifications and validations. The how to use aspects have been expanded as a result of many conversations with other engineers and these now cover the derivation of soil properties from laboratory testing through to assessing the in situ state by processing the results of cone penetration testing.