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In this paper we propose a new method for computing the effect of tunnel excavation on the piezometric head field by taking into account the excavation advance rate. This method makes possible the computation of the hydraulic head in only one step, with considerable saving of computational effort. The seepage flow equations, usually formulated in a fixed coordinate system, are here reformulated within a frame of reference that advances together with the tunnel heading. The advance rate appears as an additional parameter in the equations. The transformed equations are solved by the finiteelement method. Numerical examples are employed to illustrate the usefulness of the method proposed.
Index Terms:rock; TunnelingGroup
Further Information:Date published: 1993