Research On Deformation Law Of Deep Foundation Pit Engineering

It is an important subject to conduct the research of the Deformation Law of Deep Foundation Pit of Subway Station in the construction of Subway Foundation Pit.It has significant guiding principle in the subsequent construction.The author analyzed the site monitoring data based on foundation pits of 10 subway stations which are in first-stage of Deep Foundation Pit of Subway Station Project of Shijiazhuang subway line 1.At same time he studied the deformation law of Surrounding Protection Structure.With the help of the Finite Element,and take the common function of pile shaft and supports into account,the author simulated the supporting environment of the pits.Finally,he got the ensuing results:1)In this paper,the author will give an elaborate description of the research status,which based on the Deformation Law of Deep Foundation Pit of Subway Station and the application of Numerical Simulation;Meanwhile,give a simple introduction about the damage mode of Deep Foundation Pit of Subway Station and its deformation mechanism.2)Combined the site monitoring data with the stations of those 10 stations,the author analyzed the deformation law of the horizontal displacement of retaining pile body,based on his analysis of the function of pile top displacement and ground settlement and axial force foundation pit excavation support.3)The author chosen the deep foundation pits of the 10 stations on Shijiazhuang subway line 1 as his research objects,calculated the final data of horizontal displacements of these retaining pile bodies,and analyzed the data of displacements which changed with their depth.The results show that:the horizontal displacement value of retaining pile,which range from 0.1H%~0.6H%,is less than 12 mm,the maximum horizontal displacement are located at 0.4H~0.6H.Furthermore,he conducts a statistical analysis of the final settling volume based on the site monitoring data of 147 surface observing sites that located at 16 foundation pits.The results show that:the maximum settlement is located at distances of about 10 to 15 m from the wall,and is less than 10 mm.4)With the help of the Finite Element,the author simulated the construction processes of Xiwang Station.Due to the basically similar data of the site monitoring and the result of simulation,thus the parameters of model selection was close to the actual data can be proved.