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In tunneling through squeezing ground, deformations and rock pressure are commonly estimated under the assumption of plain strain conditions. However, when the length of the fault zone is small with respect to tunnel diameter, shear stresses are mobilized at the interface between sound rock and squeezing ground. Due to this so-called "wall-effect", ground movements as well as rock pressures in short fault zones are considerably smaller than the ones predicted by plain-strain analyses. In this paper, the effect of the length of a fault zone on the excavation-induced deformations is analyzed by means of axisymmetric elasto-plastic finite-element computations. The results of a comprehensive parametric study are presented in the form of dimensionless ground respone curves which cover the entire relevant range of parameter values.
Authors:Kovári, Kalman and Anagnostou, Georgios
Index Terms:rock; TunnelingGroup
Further Information:Date published: 1995