ABSTRACT
ABSTRACT: There is no clear and practical code to guide the design of large-span shallow-buried highway tunnel, for the main reason of this it is difficult to determine the surrounding rock mass parameters. In this paper, based on the elastic-plastic theory and the displacement of the field loading tests, the calculation model of the displacement back analysis was set up. The theory of the finite element inversion computation was used and the four basic rock mass parameters were calculated by the finite element inversion theory. Then the four basic rock mass parameters were used in the finite element computation model to calculate the vault settlement of the each step of the excavation. The results of calculation agree with the measured values, which show that the identified surrounding rock mass parameters are credible.
