Abstract
In order to determine the optimum executive conditions of the primary lining constructed in a time dependent soft rock tunnel, a theoretical method has been proposed. In this method, earth pressure, displacements and axial stresses of supports and shotcrete are calculated, and in which such factors are taken into account as (1) viscoelastic behavior of the ground, (2) advancing velocity of the tunnel face, (3) time dependency of the modulus of elasticity and the strength of the shotcrete, (4) elastoplastic behavior of the lining, (5) executive conditions of the lining.
By appling the method to the highly time dependent ground, good applicability of the method has been shown through the comparison of analytical and field measurement results on earth pressure.
Some considerations on reasonable executive conditions of the primary lining are given by performing parametric study.
