  This paper develops a complete analytical solution for the drained (or dry)
cylindrical cavity expansion in non-associated Mohr-Coulomb soil, by using the
graphical approach and Lagrangian formulation of the cavity boundary value
problem (through tracing the responses of a single soil particle at the cavity
wall). The novelty of the new solution lies not only in the relaxation of the
strict intermediacy assumption for the vertical stress as usually adopted in
the previous analyses, but in the comprehensive consideration of arbitrary
values of K_0, the coefficient of earth pressure at rest, as well. The essence
of the so-called graphical method, i.e., the unique geometrical analysis and
tracking of the deviatoric stress trajectory, is fulfilled by leveraging the
deformation requirement that during drained expansion the progressive
development of the radial and tangential strains must maintain to be
compressive and tensile, respectively. With the incorporation of the radial
equilibrium condition, the problem is formulated to solve a single first-order
differential equation for the internal cavity pressure with respect to a
pivotal auxiliary variable, for all the distinct scenarios of K_0 being
covered. Some selected results are presented for the calculated cavity
expansion curve and limit cavity pressure through an example analysis.
