178 TIME-DEPENDENT AND NON-LINEAR PROBLEMS
actual boundary of the excavated volume is represented by imposing
fictitious forces on its boundary in order to enforce the zero applied
tractions there. The analysis is then capable of determining the
stresses and displacements in the surrounding medium after the
excavation has taken place. There is good agreement between the
numerical and analytic solutions, for the stresses and induced
displacements around thin slits in a triaxial stress field as well as for a
circular tunnel between soft horizontal seams.
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