Analysis of the effect of mud-water balance shield on soil through water-rich sand layer

Based on the background of the shield crossing the Wei River section of phase III project of Xi’an Metro Line 1, this paper makes a numerical simulation of the shield crossing the Wei River, adopts the digging parameters roughly the same as its actual construction parameters, and analyzes the law of soil displacement during its crossing by comparing the displacement nephogram and drawing the relevant curve. The conclusions are: in the process of shield excavation, the deformation of the whole soil presents a form of collapse along the tunnel axis, and the displacement of the soil presents a process of first enlargement and then smooth change.