Deformation analyses of excavated-underground metro station at different depths in soil-rock combined strata

摘要

Qingdao is located in a coastal area with thin soil strata; thus, the typical geological structures with soil in the upper part and rock in the lower part are often encountered, that is, the so-called "soil-rock combined strata". In this paper, the excavatedunderground Fushansuo Station of Qingdao Metro M3 Line was based to carry out numerical calculations for different depths and construction methods to analyze the deformation of surrounding rock and distribution of plastic zone, and as a result, the optimum burial depth was determined and a kind of design method was proposed for determining the burial depth of excavated-underground metro stations in these areas with soil-rock combined strata. The research results have been used in directing practical design and calculations and hence contributed to the accumulation of theories and experience in construction of excavated-underground metro stations in Qingdao area.