Study On Deformation Behavior Of TRD Enclosure Structure For Deep Foundation Pit

Since the last century,our country's construction of a large number of high-level and high-rise buildings,large underground structure of the subway station and many facilities,buildings in the city is more and more intense,resulting in the foundation pit engineering constantly towards deeper,more and more near buildings in the direction of development,always ahead of theory practice,this makes the various problems in deep foundation pit engineering then gradually emerge.As a new supporting method of underground structure,TRD construction method has been applied in more and more important foundation pit projects due to its advantages of uniform wall thickness,good homogeneity and good water-stopping effect.Taking a deep foundation pit project as the background,this paper studies the deformation characteristics of TRD construction method retaining structure by using theoretical analysis,construction site monitoring and finite element software simulation.The main work contents and conclusions are as follows:1.This paper introduces the characteristics of deep foundation pit engineering and TRD construction method,as well as the current research status of TRD construction method.2.The monitoring data of the monitoring scheme of this deep foundation pit project are analyzed.The surrounding settlement of the foundation pit,the horizontal displacement of the TRD retaining structure,the axial force of the internal support and the variation of the groundwater level outside the foundation pit are obtained.The trend chart of the change with the depth of the foundation pit excavation is drawn,which reflects the deformation characteristics of the TRD retaining structure.The results show that the retaining and water stopping effect of TRD retaining structure is very good,which has the value of popularization and application,and can provide reference for similar deep foundation pit projects in the future.3.The finite element numerical simulation software Midas GTS NX each construction stage of the deep foundation pit engineering,simulated and analyzed and the simulation results compared with the monitoring data,simulation results slightly greater than the monitoring value,shows that the application effect of TRD method of retaining structure is very good,it has high strength and stiffness,goodreliability in the practical engineering application.4.On the basis of the above work,the use of the inserted steel method for further simulation analysis and the simulation results and the previous simulation results contrast analysis,find the true method of inserting steel simulation results of small,further confirmed that the concrete retaining wall in the section stiffness of soil-cement mixing wall contribution,for the steel to the design and construction of soil-cement mixing wall provides a certain reference.