Mohr Circles are a powerful and widely used technique for representing stresses and strains in soil and rock, and for converting test data into design parameters, but they have many other uses in solving geotechnical problems. Mohr Circles, Stress Paths and Geotechnics gives a unified presentation of the theory and application of the techniques, and is the only book to examine the behaviour of both soil and rock in a fundamental and comprehensive manner. The second edition of this well established book has been comprehensively updated in line with recent developments. After presenting the fundamentals of stress and strain, and their graphical representation, the book includes chapters on failure states in soils and rocks, observed and elastic paths, and the use of discontinuities. New sections include shear bands and small strain behaviour, as well as the use of elastic shear modular stress calculations and discontinuities in plasticity calculations. Expanded coverage is also given to dilitancy of soils and roughness of rock joints. Mohr Circles, Stress Paths and Geotechnics will be invaluable for geotechnical engineers in teaching, research and practice.