Surrounding Rock Pressure Analysis of Underground Station with Extra-large Section and Small Spacing

Abstract

The design and construction of underground station with extra-large section and small spacing is one of the difficult issues of concern of the civil engineering sector. Since the time is short, the theoretical research of underground station with extra-large section and small spacing is far behind the engineering practice. There has not been a unified understanding of the distribution rule of the station surrounding rock pressure, only with the means of numerical simulation study. In this paper, a small distance station of Chongqing rail transit is taken as the background, using the large finite element software MIDAS/GTS, a two-dimensional numerical model is established for analysis and calculation. Through respectively changing the different buried depth and spacing, the influence of the surrounding rock pressure from buried deep and spacing is studied and the basis is provided for the design and parameter optimization of the station lining structure.