Deep Foundation Pit Support Technology Research And Engineering Applications

With China’s rapid economic development and urbanization process accelerated, deep excavation engineering importance and complexity with the increase of the excavation depth is also increasingly exposed. Due to the increasing complexity of functional requirements, the type of support system, the support structure is relatively simple form of support has been unable to meet the support needs of the ultra-deep foundation works mostly by the combination of different support support, give full play to the advantages of each support type, so that the economy, a reasonable selection. The development of any of the things always constantly cycle through the practice and theory of alternating process of continuous development of the final. Deep Foundation Pit project is no exception, as the deep foundation pit speed forward, the existing theoretical research on deep foundation needs to be to continue to deepen the deep foundation Selection design and computational theory deepening become a hot and difficult in the engineering sector. Reasonable relationship to accurately calculate Pit Supporting Structure own security is also related to the safety of the surrounding environment, the project cost and schedule. Therefore, the research and application of technology and construction technology of deep foundation pit support is necessary.This paper will Putian Wanda Plaza deep foundation pit support engineering background, in brief deep foundation pit support at home and abroad on the basis of introduce several key features common deep foundation pit support, technical principles and the soil pressure and related the supporting structure of the force calculation, at the same time introduced the construction technology and technical standards, analysis of its subject through the simulation of changes in the torque value of the effective stress and displacement of earth excavation works Middle-earth changes and the excavation process are charged retaining pile force, maximum displacement point to summarize the law of the deformation, and combined with engineering actual monitoring data based on analysis of the deformation of the entire excavation. Reach10%to15%a year, according to the National Statistics pit failure in soft soil area is about25%, and visible excavation engineering in terms of design and construction are faced with a more severe form, there are a considerable number of problems waiting for us to resolved actual engineering Pit Supporting instability analysis for the case, summed up the pit accident caused mainly due to inaccurate geological survey results, the incompleteness of the design considerations, the substandard quality of the construction unit, the pit in the basement or flooding management in place a variety of factors such as composition, is a long way to go in the visible deep foundation engineering topics.Above problems, after engineering rational design and specification construction should help to have a certain reference in the rational selection and control deformation.