Realistic prediction of the behaviour of soil masses can only be achieved when the model considers the interaction of the soil skeleton and the pore fluid. This book presents the basis of this computational approach, applied to earthquake engineering. This book presents a simple computer code with 1-D geometry but 2-D movement to aid the understanding of the theory. This book is essentially for those academics and researchers who have limited experience of programming but who use computer modelling for their research into geomechanics, soil movement and earthquake engineering. Several different models are presented here together with a graphic post-processor to facilitate the development of new and modified constitutive models. Practical considerations in the application of the computer codes are given together with a detailed explanation of the numerical code developed. Features include: * A workable computer code capable of analysing several types of problem and giving a clear explanation of 1-D geometry. * Clear and comprehensive explanations of complex modelling of soil behaviour. * Detailed step-by-step analysing procedure explained by analysts with 15 years of experience. Earthquake and geomechanical engineers as well as academic researchers in earthquake engineering and postgraduate students in civil engineering departments will find this an invaluable resource.