Stochastic Finite Element Analysis Of Reliability Of Rammed Cement-Soil Pile Composite Foundation

The rammed cement-soil pile composite foundation is a new developing method ofprocessing-foundation in recent several years. Because of the characteristics of largebearing capacity, slight foundation deformation, low cost ,short period and pollution-free,it is applied to the practice of hundreds of projects extensively in North China area toobtain the remarkable economic efficiency. Very many researchers study its design, theconstruction, the bearing capacity, the deformation, and so on. But few researchers studyits reliability. At first, the spatial variability and the correlation of physical and mechanicalparameters of soil and rock are regarded as random fields, the pile-soil model is built andsolved by ANSYS finite element method. Then the model of random fields of parametersof soil and rock are simulated with Monte-Carlo method and the stochastic finite elementanalysis of the rammed cement-soil pile is realized by Monte-Carlo stochastic finiteelement method. Finally the limiting state equation of single pile's vertical bearingcapacity is established,a relevant reliability calculation procedure is programmed andmore accurate failure probability and reliable index are solved. At last, the paper cites asample and calculates and analyzes its reliability, and roughly verifies that the reliabilityindex was 2.6, which is corresponded to the limit state of bearing capacity of the rammedcement-soil pile composite foundation in Technical Rules for Composite Foundation ofCement-soil Piles DB13(J)142003.