The Door Type Sheet Pile Retaining Structure Stress Analysis

Deep cut slope is more easily to encounter in the process of engineering construction, especially in complex surrounding environment, narrow and other unfavorable terrain of Deep cut slope, the ordinary retaining structures is difficult to meet the requirements for supporting. At this point, usually need to develop a new type of retaining structures supporting and reinforcing the slope. In this paper, according to the project of special topography and engineering characteristics, puts forward the door type sheet pile retaining structure of Deep cut slope. The structure set lateral crossbars lateral and Longitudinal crown beam at the top of the anchor pile on both sides, so that the piles are connected as a whole. It breaks through the freedom cantilever of traditional pile walls should not be greater than 15 m, but also avoids the impact of the use of Bolt(Cable) for existing buildings, but also meets the structural lightweight, mechanization, prefabricated assembly, energy saving and environmental protection requirements.The door type sheet pile retaining structure of deep cut slope is used for the first time in the field of engineering in China. There is no ready-made norms and experience for their theoretical reference. It requires in-depth analysis and research for providing a theoretical evidence for engineering design. and construction, and promoting this new structure to apply to the deep cutting slope.The main research contents and results are as follows:â‘ According to the characteristics of the project, first of all, analysis the calculating model and the calculating method of the deep pit retaining structure and long cantilever pile, mainly discusses the calculation principle, calculation process and application of static equilibrium method, equivalent beam method elastic foundation beam method.â‘¡Based on the calculation theory of deep pit retaining structures and anchor piles, propose two kinds of calculation model of the single fulcrum pile board structure and portal frame structure of the whole space for the door type sheet pile retaining structure of deep cut slope, and puts forward the equivalent beam method and "the type of portal structurecalculation method". By calculating the stability of the structure about the overall stability, stability against overturning and basal heave stability and other aspects, the results show that the whole stability to meet the requirements.â‘¢By using the equivalent beam method and "monolithic gate structure" calculation method to calculate the door type sheet pile retaining structure of deep cut slope, the calculation results show that the latter method calculate the stress is more uniform, and has better entirety.â‘£By using FLAC software to analyze the door type sheet pile retaining structure of deep cut slope, analyze four cases(with or without crossbars, crossbars position and whether the use of CFG pile composite foundation)to reflect the effects of crossbars and CFG pile composite foundation for overall structural stability, and thus determine the appropriate program.Based on the calculation theory of deep pit retaining structures and anchor piles, discusses the door type sheet pile retaining structure calculation theory, and established the advantage "the type of portal structurecalculation method" by calculating an engineering example; The results of the numerical analysis reflect the changes of stress field and displacement field in the process of excavation, further reveal the added crossbars and its position selection and CFG pile composite foundation paly an important role on the whole structure; through the analysis of the structure of the theory, can promote the application of the structure in deep cut slope.