Abstract
Supposing that a circular tunnel without lining is driven at a deep point in the visco-elastic ground whose surface is horizontal and deformation characteristics of the ground material are expressed by Voigt model, the radial displacement around this tunnel which changes with time passing can be calculated theoretically. In order to check this theoretical displacement by experiments on a tunnel model, this theoretical displacement is calculated, introducing the method of measuring the visco-elastic coefficients of ground material and utilizing these coefficients. This theoretical displacement is compared with the measured displacement obtained by experiments on tae tunnel model.
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