Monitoring Of Deep Foundation PIT Engineering Of Qingdao Subway

This thesis take the mechanism and factors that lead to land deformation as the study carrier of deep pit construction and with observation of surface, building, envelope, and the pit water level and so on during excavation and construction of Licun transfer of Qingdao subway, we proposed that monitoring measurement is the indispensable mean to ensure the safety of construction and the success of project through the summarize of the envelope structure deformation, land subsidence and the feature of land deformation of pit bottom.We get conclusion from the analysis of monitoring data of deep pit from No.1pavilion and5th import and export that, the displacement value and displacement range of the horizontal displacement of the direction perpendicular to pit increase gradually and the deformation will exceed the value at the end of the previous condition rapidly and the site of the maximum displacement value will gradually down with the excavation depth of pit grow during the process from the excavation of pit to the completion of the entire support.The largest settlement of pit is not far from pit and the settlement will decrease with the increase of the distance from pit to settlement and the settlement will close to zero at a certain distance.The bottom heave will decreases gradually and the maximum value will closer to the pit location point gradually to the surrounding radiation with the follow-up of excavation and support, also the maximum springback will in the bottom of the pit of middle region with the minimum springback around the pit, with is called the space effect during the excavation of pit.For the limit of time of this project and construction technology and the factor of time also have a larger impact of the construction monitoring, so we use FLAC3D do simulation and prediction first and then monitoring and analysis...