Ri Woods

A computer design method for reinforced soil structures

Abstract A computer program for the analysis and design of reinforced soil structures is presented. The program is based on a modified limit equilibrium method in which the effect of reinforcement on both normal and shear stresses is recognized. Two-part wedge mechanisms have been chosen on account of their simplicity and their adaptability to the presence of reinforcing inclusions. Layouts of reinforcement to give desired safety margins may be designed rapidly and interactively, facilitated by the provision of clear graphical output. Extensive practical experience with the computer program has established it as an important design tool.

Investigation of the Accuracy of Numerical Modelling of Seepage through Variably Saturated Soils

A numerical model is presented for the solution of flow in variably saturated porous media (single-phase, isothermal fluid flow), assuming continuity of flow between unsaturated and saturated soil zones. It allows for continuous variation of the hydraulic properties as a function of the pressure head using real soil data taken from relevant literature [12] and takes into account hydraulic property hysteresis. Numerical results compared with experimental results found in the literature [12], show the significant impact of ignoring hysteresis in numerical analyses of seepage. Moreover, a linear type model for hysteresis is shown to produce satisfactory results, despite its simplicity.