Design And Optimization On Foundation Pit Supporting Of Changchun Buynow

Foundation pit support is the hot and difficult problem in geotechnical engineering nowadays. Construction appeared since people began to build, from the ancient to the present. The deep foundation pit engineering is the old foundation engineering, and it is also the geotechnical integrated each subject. As social productive force developing constantly and the height of buildings increasing, it need foundation deeper more and more to adapt to the building requires, and the difficulty of structure supporting is increasing, so there is a new content and challenge for the ancient subject. There has been such contradiction that haunts us in current foundation pit engineering design, the security and the economy. Because of lack of reliable design theory and better supporting method at present, it is often to make the supporting and design conservative for the safety in actual project. Therefore it has to increase investment and result unnecessary waste. On the other hand, sometimes it reduces the stability of foundation pit, deformation control and safety aspects of the design requirements in order to pursue economic, thereby causing the engineering accident, and resulting in greater economic losses. The way to solve this problem reasonably is to study the optimization design of deep foundation pit engineering.The content analyzes the history and research status of foundation pit engineering firstly, and describes characteristics and applicable scope of various supporting forms. Then it makes analyses and compares with the each support forms probably used on economy and technology, aiming at practical condition of Changchun Buynow pit engineering. It selects the anchor pile and composite soil nailing wall supporting method, designs and calculates respectively, then makes checking using Lizheng deep foundation pit software, finally makes finite element numerical simulation of excavation process with the structure that is employed. It starts the careful research on the theory and method of the excavation process of foundation pit, analyses the forming the initial stress field and the displacement field of the foundation pit, and puts forward considering the excavation unit, node, the support, and numerical simulation method that fits excavation. Combined with practical engineering detection, using GTS finite element program has carried on the analysis, contrast to the actual result. To determine the parameters and the accuracy of numerical simulation, for me the province after the deep foundation pit support design and construction to provide a practical basis.