Study On The Reliability Of The Auger Bored Cast-with-pressure Concrete Pile

Auger bored cast-with-pressure concrete pile has been widely used in wuhan and acquired great social and benefits for rccent decade, which has many advantages such as high single pile bearing capacity, great construction efficiency, large economical benefits and environment preserved. A lot of practical examples show that the technique of this kind of pile has greatly developed. However the design theory has fallen behind the engineering practice. Because the limit bearing capacity of this kind of pile is sensitive to the technique, which is impossible to consider as a certain mode. This paper uses the JC method of reliability theory to evaluate reliability index of limit bearing capacity of auger bored cast-with-pressure concrete pile and how to ascertain the partial factor in design, which makes significance of security more and more definite and objective.This paper studies on the evaluation mode of limit bearing capacity and the limit state equation of augcr bored cast-with-pressure concrete pile. The statistic properties of basic variables in the limit state equation are deduced by mixed using static load test static sounding and experienced formula. By using the JC method of reliability theory, the influence of parameters to the reliability index are analyzed by means of an engineering project. The results acquired in this paper have meaning for designing auger bored cast-with-pressure concrete pile in practice.In order to direct structure design directly, the partial factors of auger bored cast-with-pressure concrete pile are studied in the end. The limit state equation is simplified. Two methods to define partial factors are expounded under two cases; reliable and unreliable. The influence factors such as target reliability index load distribution ratio and live load effects to partial factors are discussed. So we can according the conclusion to design auger bored cast-with-pressure concrete pile.