Static Pressure The PHC Pile Composite Foundation Deformation Calculation Study

As a main type of rigid-pile-composite foundation, pre-stressed concrete pipe pile foundation has been widely used in many kinds of projects because of its advantages of ease construction, high quality, high adaptability and good behavior of anti-seismic. There is wide developing foreground for pre-stressed concrete pipe pile foundation. In some littorals provinces, such as Guangdong, Fujian province, pipe pile is at the major status on the design selection of pile types.At present, the technique of pre-stressed pipe pile foundation by ways of Pressed-in installation is developing at a high speed. However, there are still a few problems in the aspects of studying and application because of short applied time, especially the calculation theories for settlement of pipe piles composite foundation are not mature enough. Many accidents were caused by large settlement of buildings. A set of code has not yet been made in Zhengzhou. The calculation methods for settlement of pipe piles composite foundation only can learn from general composite foundation theories. Deformation calculation methods of PHC pile composite foundation should be studied. The main methods, contents and results in this paper are as follows.(1) The deformation carried from the experiments of the compound foundation of The PHC tube pile is a moment one, but the method in the mode, a layer method, up and down stab etc, existing and rigid pile compound foundation all with end transform for compute the object, measure value with theory result exist important difference. The method by experiment on the spot to study to build up the model of compound foundation deformation computation is unreasonable.(2) The spot following monitor of the compound foundation is to the exact choice of building up deformation computation model.(3) Because of immoderation between the pile and soil of compound foundation, following the erection to exist a deformation bad, then a soil of a crest should the dint compare with an a soil for face of each soil layer should be different. Think to take the same mold quantity exaltation coefficient in the different soil layer to not agree with the actual engineering, so cause deviation in the norm method calculation result.(4) Putting forward" the revised method of mold quantity exaltation coefficient" is the compute model of a compound foundation of PHC tube pile: on the basis of keeping the current norm formula about the deformation computation, put forward to endowing with the particular mold exaltation coefficient, according to the loading characteristic value of each soil layer, can make the calculation result even near to the value actually on the spot.(5) Use the software of ANSYS to carry on the emulation of a compound foundation of PHC tube pile, the imitation result relatively nears to actual circumstance, further verify the rationality of the deformation computation of PHC pipe pile by the revised method of mold quantity exaltation coefficient.