| Based on the theory of composite foundation improved by Dry Jet Mixing and probability limit design method, established the sestem reliability model of composite foundation improved by Dry Jet Mixing, and considered correlation of composite foundation improved by Dry Jet Mixing subsystem main failure mode, proceed sestem reliability analysis by narrow bound method, and get the follow research result.(1) Procede the probability statistics about load testing data of mass composite foundation improved by Dry Jet Mixing in Handan, get regularities of distribution of base random variable about point reliability analysis. Againsted the characteristics of multivarizte and non-linearity of the limit status equation, used error transfer theory in reliability index solution, simplified solution code of reliability index. Precede reliability index solution on bearing capacity subsystem and settlement subsystem of composite foundation improved by Dry Jet Mixing, and precede sensitivity analysis with random variable.(2) Established reliability solution calculation model of composite foundation improved by Dry Jet Mixing, looked for main failure mode of system, and analyzied correlation among every failure mode, calculated correlation coefficient among every failure mode, applied narrow bound method to calculate general failure probability of composite foundation improved by Dry Jet Mixing.(3) Combining case history with point reliability solution, applied narrow bound method to calculate general failure probability of composite foundation improved by Dry Jet Mixing, appraised system reliability, precede sensitivity analysis with correlation coefficient of main failure modes in system reliability solution.Previous analysis is more impotant in security appraise of composite foundation improved by Dry Jet Mixing and optimum design based on reliability. |
