Study On Selection Of Soldier Pile Structure On Deep Foundation Pit

With the increase of high-rise buildings, subway projects, municipal projects and the development of underground space scale, foundation works as well as excavation accidents have increased for nearly 10 years. Selection of supporting structure to excavations is an important reason for the accidents, but because of complexity of the foundation project, study of it is not systematical enough. In the paper the main content is as follows:Based on the analysis of the causes of the accident pit, discussed the basic safety requirements of excavation and safety levels set under the support structure of the status quo,the paper is selected Chongqing common pile supporting structure of the type studied by using silt homogeneous geological model systematic comparison method to determine the structure of selection.The paper discussed the pile supporting structure construction, and summed up the machinery of bored piles and bored piles, bolt and top beam and waist beam characteristics, scope of application, construction technology and construction attention.Through the analysis and discussion the calculation way is detemermined in the paper.Meanwhile,the method of the techno-economic valuation isdetemermined with the features of the cost on excavation.Aimed at cantilever pile and pile-anchor,using method of beam on elastic foundation,through multiple combinations of pile spacing, diameter, embedded-depth at different levels excavation depth, the imact is discussed on the greatest displacement, maximum bending moment, the largest shear forces of search options,and in different excavation bolt locations impact on maximum horizontal displacement, the greatest moment of medial and lateral bending moment, the biggest shear bolt shaft and the impact of search options.Then techno-economic is performed to find the economic plan and give suggestion to the project.Finally, the transcript summary, the next step in research work envisaged.