| The spatial effect of surrounding rock generated by tunnel construction will different because stratigraphic distribution, buried depth, construction method. Aimed at the stability of surrounding rock, the spatial effect in construction of shallow-buried tunnel passing through loess area was studied through application of site monitoring, mathematical statistics and theoretical analysis methods. Taking the shallow-buried tunnel located in Exhibition station in xi’an metro as example, this paper discussed the relationship between measured data and theoretical formula and revealed the rule of vertical displacement about overlying loess induced by tunnel excavation systematically. Some conclusions drawn from the study as follows:1. Ground traverse settlement trough caused by shallow buried and darkly excavation tunnel passing through loess area can be expressed by Gaussian equation. A parameter value suitable to loess area was suggested in Gaussian equation.2. The rule of the vertical displacement of soil layer and the scope of longitudinal effect caused by tunnel excavation was summed.Finally taking the practical engineering as model, three-dimensional numerical analysis of spatial effect in construction of shallow-buried tunnel passing through loess area was proceed by using ANSYS software. The vertical displacement of surrounding rock caused by tunnel exaction in whole section method and bench method were analyzed. It can provides reference for subsequent construction through the comparison and analysis of the upper two conditions. |
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