The Research Of Stress And Deformation On Single Tension Pile

In this paper, based on the static-load tests of the tension piles on the province of Zhejiang such as Hang Zhou Qige Sewage Treatment Plant Project, etc, the calculations of ascending displacement, developing mechanism of the side friction and utmost bearing capacity of the tension piles are studied. And combined with the developing of the tension piles, the techniques of the construction are studied such as the squeezed branch with antipulling behavior. Failure modes of the tension piles are introduced first. Based on the failure modes, the utmost bearing capacity calculations of the engineering practice data, one method to calculating utmost single-pile bearing capacity is provided after simulating the uniform-section pile side friction. The failure modes of the single tension pile to mainly have three kinds of the following: (1)Follow the pile-the soil side interface shears to break; (2) The shear failure mode of the inverse cone similar to the pile height shear failure; (3)The compound shear failure. General, long piles especially, take place the first failure mode. Combine to measure the data actually, deduce the utmost bearing capacity and the calculation formula that correspond to transform. (1)According to the property of the silty soil, built up the transform mode of the pile -silty soil, deducing the utmost single-pile bearing capacity formula and the transform formula, and with experimented the result to carry on the comparison .Due to the regulation of the mode for shear transform , deduce the single tension pile solution of theory, and experiment the result with indoor model to carry on the comparison . (3)Learning the solves to the in general use theories, make it combined with the engineering, resolved the problem in it .Analyze the result enunciation, the calculation type that this text put forward has the good calculation accuracy. Be subjected to the stress and transformed mechanism ,carry on the analysis towards expanding the exploding bottom pile ,Explore a reason for the utmost bearing capacity and the correlative displacement , pull out main factor of the quantity ,To expanded the calculation that an extreme limit of bottom loads the dint to put forward the calculation method .The influence of the expanding bottom pile modality look quite a few and very complex .Along with the construction method, the foundation depth and the physics mechanics property but varieties of the soils, make sure the failure modality that the bottom pile in advance very difficult .When compute the stress of tension , it is proper to establish several more possible failure modality, choosing the conduct and actions that it resists the ability least as the most dangerous slip surface .A function of extension of single bottom pile is very obviously, can raise the utmost bearing capacity biggest .The utmost bearing capacity that it provide has the greatly percent of the total .The expanding bottom pile is not only improve the ultimate bearing resistance, but also improve the pile antipulling function .The usage of the expanding bottom tension pile , can lower the engineering investment effectively, and can raise the safety degree of the pile . The squeezed branch pile was always accepted to the press foundation. The research and application of the antipulling capability was little, it was often neglected its antipulling capability. Its shape and its special construction crafts not only raised the utmost bearing capacity to press, and but also raised it to lift. Combine the current local a present condition of construction, analyzed...