Study On Deformation Control And Environmental Effect Of Metro Pit Using Semi-reverse Construction Method

Because the subway stations are usually loaded in city center of politics, economy, culture and traffic. Around the stations, buildings are crowded, traffic is busy, pipelines underground are densely covered. Surrounding environment is very sensitive to soil deformation in metro pit excavation. Now the construction of metro pit excavation is more and more difficult, deformation control of the metro pit is more and more strict, traditional open cut method becomes incapable. Semi-reverse construction method which can control deformation better has been used more and more widely in metro pit. So evaluation of semi-reverse construction method s merit, demerit and application foreground in metro pit construction becomes a new subject which must be settled as soon as possible. This subject has very important practical significance and guiding role.In the research background of metro pit project in shanghai, this paper studied the characteristic of semi-reverse construction method by judging its design theory and construction technics. Then this paper studied the semi-reverse construction method s characteristic in deformation control and pit project protection by the method of finite element numerical simulation and analyse of monitoring data. Last this paper studied the semi-reverse construction method s trait in surrounding environment protection.From the research in this paper, I learned that the semi-reverse construction method has a powerful ability in pit deformation control and environment protection. This paper also prepared the semi-reverse construction method to all- reverse construction method and traditional open cut method, and the gave a useful judgment of semi-reverse construction method. This judgment will give an argumentation to extension of semi-reverse construction method and offer a consultant to similar research work. Finally, the scheme of the further study is described.