Ground behaviour and settlements analysis on tunnelling of shallow-buried metro in Tashkent city

Abstract

This paper proposed a calculation method that reflects the process of deformations of the soil mass and subsidence of the ground's surface around the shallow subway tunnels and their study, taking into account the engineering and geological conditions of the construction site on the third line of Tashkent metro. The vertical ground displacements of soil mass and zone of destruction (instability) around the hole of the running tunnel of the metro located at different depths were determined. As a result of the numerical calculations performed, the settlements of the ground's surface were determined during tunneling by the shield method. It was found that the maximum value of the trough of the ground's surface decreases with an increase in the depth of the tunnel. This is because with deep tunneling, settlements are largely determined by the decrease in the vertical pressure of the soil on the tunnel due to the formation of a limited disturbed zone around the tunnel hole.