Reliability Analysis on Vertical Bearing Capacity of Bored Pile Determined by CPT Test

摘要

Based on the random field theory and reliability theory, the statistical methods used in the research on the probabilistic features of parameters,P_s,f_i,P_(sb) had been studied. In addition, the problems with the correlation distance, pile cross section dimensions and the range of pile tip resistance, which would be used in the reliability analysis, were discussed in this paper. The reliability analyses were made on seventeen (17) construction sites based on forty-six (46) CPT test curves in Shanghai area, China. The reliability indices were obtained and the probabilistic characteristics of reliability indices were derived accordingly.The study shows that: (1) generally, the reliability index of large pile in diameter is greater than that of small pile for either prefabricated pile or cast-in-place pile, and the coefficient of variation of reliability index of prefabricated pile is less than that of cast-in-place pile; and (2) For bored piles, the variation coefficient of reliability index is less for big pile in diameter (or dimensions) than that for small pile in diameter (or dimensions)....