Research On Deformation Of Layered Soils Overlying And Foundation Of Adjacent Buildings Caused By Shield Tunnel

With the ever-increasing urban population, urban traffic congestion has become a major factor restricting the economic development of the city. To alleviate the problem of urban traffic inconvenience, country pay more attention to developing City subway project. Currently, the shield tunneling technology has become the preferred for excavating city metro tunnel. However, due to the shield tunneling process will produce overburden disturbances and cause surface uplift or subsidence. When the shield tunnel through the building of the city from the bottom, this disturbance will make the upper building produce uneven foundation settlement, which will cause the building inclined. Therefore, the study of shield tunneling effect on surface subsidence and the mutual influence when shield tunnel through from the bottom of the building has a very important practical significance.This article is based Engineering College Station to Liaoning University Station Interval shield tunneling as engineering background.For these problems to carry out related research. Taking the distance between the tunnel and the building in to consideration, numerical simulation analysis is applied to simulate the mutual interaction between tunnel and the building over the tunnel. First, changing the eccentricity ratio between the tunnel and the building, some conclusions have been made:with the increase of eccentricity ratio eO, building foundation settlement distribute from symmetrical distribution along the centerline into a one-way tilt and building foundation overall tilts to the side of the tunnel and it is the most unfavorable case when the tunnel eccentric is l.Then Analysis the tilt rate and the differential settlement value when the tunnel eccentric is 1, results show that its allowable values are all met.Displacement characteristics on the surface are summarized by field data. Vertical deformation monitoring point first increases, then decreases, and finally stabilized. Monitoring section presents roughly the shape of a settling tank. Then calculate and analyze the formation interval shield loss rate as roughly 1.2%.