Research For Ground Surface Settlement Due To Tunnel Construction In Kunming Metro Line3

the subway tunnel is an important structure of a city rail transit system, especiallythe subway tunnel under construction in the construction process, because of the influence ofdifferent disturbance, produced on the rock and soil around, leading to the surface subsidence,due to surface generate subway tunnel construction settlement will affect the construction withinthe scope of the existing pipelines, and the surrounding buildings. The surface subsidence isto some degree inevitable interference surrounding buildings, and the existing pipeline safe use,serious damage to people’s life and property safety. As far as possible in order to take measuresto deal with the negative effect caused by the subway tunnel construction brought about on theearth’s surface settlement of metro tunnel, needs to study the settlement mechanism of subwaytunnel construction method, according to the number of surface subsidence data collected, throughthe schemes to determine the best construction process, the preparation of a practical andeffective measures to ensure the safety of subway tunnel surrounding. Buildings and undergroundpipeline facilities during the construction of the.This paper relies on me to participate in the construction of the engineering example (sectionof East Kunming Metro Line3), according to the measured data of ground surface in subway tunnelconstruction technology of several different sections through the settlement, settlement dataclassification, analysis of ground surface settlement index of shallow tunneling method and shieldmethod construction cause study. In this paper, using mathematical statistics method for nonlinearregression, polynomial regression, piecewise function regression analysis. The ground subsidencedata research and analysis, draw the shallow underground excavation method and shield method ofground settlement analysis data, and puts forward the technical measures to deal with the groundsurface settlement. The conclusions of this paper can be the construction of subway tunnelconstruction for future similar conditions of domestic have to provide some theoretical data forreference.The main conclusions of this paper are as follows:The eastern section of the subway tunnel in Kunming Metro Line3to1shallow tunneling process,using the step method of construction process, the step of ground settlement induced by excavationof quantitative percentage accounted for by the total surface subsidence in about55%;The eastern section of the subway tunnel in Kunming Metro Line3to2shallow tunneling process,the thickness of the overlying soil tunnel is bigger, the ground settlement is smaller, thethickness of covering soil settlement with tunnel has an inverse proportion relationship;3using the settlement caused by shield method construction and settlement rate, largersubsidence stage by stage occurs before the construction work of the settlement and the shieldmachine tail void in shield machine, control the two stage settlement is most necessary.