The Support Design And Construction Research On The Deep Foundation Pit Of Qingdao International Trade Center

In recent years, the rapid development of urban construction requirements of the underground space development, the formation of a number of underground structure, such as underground shopping malls, car parks, subway stations, underground storage, underground civil defense fortifications and a variety of civil and industrial facilities. The underground structure are related to excavation, the excavation has also been considerable development. With a variety of deep foundation under complex conditions of large numbers, in the classical theory of soil mechanics can not meet the requirements of excavation, finite element theory and systems engineering gradually applied to the foundation in soft science, the engineering must have targeted the theoretical analysis, model tests, field monitoring, and many other aspects of intensive study in order to ensure the smooth implementation of the excavation. In this paper, deep foundation pit of Qingdao World Trade Center as an example, deep foundation pit design for the study, by field monitoring and numerical simulation supporting structure with complex dynamic construction of deep foundation pit-depth analysis of some of the conclusions drawn engineering practice for the future to provide a theoretical basis.Main contents of this paper the dynamic construction of deep foundation pit and deep foundation pit dynamic numerical simulation of construction process. Research methods including finite element theory and long-term monitoring site in two parts, and ultimately compared and analyzed the dynamic in the deep foundation pit excavation in the process of displacement, excavation within the rock mass and envelope stress, the stress characteristics of pile Analysis and stability characteristics of the dynamic changes of foundation, and based on this analysis of the construction process optimization. This paper obtained in the course of construction of the foundation stability factor to 2 or more, better stability; construction pit before the stage of the displacement is mainly affected by soil excavation greatly influenced by the stress change around the house foundation base greater depth of excavation pit; different support structure have different advantages, rational use of steel pipe pile and anchor support ways to effectively control the foundation displacement. In the composite pile foundation anchor pull anchor and general co-existence of the excavation process, the earth excavation requires a comprehensive program to consider the synchronization of multiple support and foundation for the stability in the safety of the construction process, the overall need to do to the excavation, support sequentially.