Abstract：
The relationship between the soil void ratio and the volumetric strain was derived based on a threephase system and the division of the disturbed areas due to tunnel construction, and volumetric strains of different disturbance areas were calculated by the finite-element method. Using the relationship between the soil mass mechanical parameter and void ratio as a reference, variations of mechanical parameters of disturbed soils before and after tunnel excavation were calculated, and the differences of influence on strata disturbance with or without considering the variation of soil mass mechanical parameters were studied. Compared with the calculation results under the assumption that the soil mechanical parameters are constant during tunnel excavation, the practical case analysis indicates the maximum ground settlement increases by 8.1% and the plastic area increases by 55.6% when considering the variation of soil mechanical parameters.
2017, Vol. 54 