Author(s)

A. Ghassemi and A.H.-D. Cheng

Abstract

The presence of a fluid in rocks can engender a coupling between the solid and fluid deformations. Biot theory of poroelasticity provides the correct coupling between the hydraulic and mechanical effects. In this paper two types of problems are investigated using a poroelastic boundary element formulation in the Laplace transform domain. The excavation induced pore pressure and stresses are treated first. Comparison of results for circular and elliptical boreholes shows that excavation geometry significantly mod- ifies the stress concentration. In addition, by studying the interaction be- tween two neighboring boreholes it is found that drilling the second hole in the direction of maximum stress is less likely to c

Keywords