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.

• 为了能直接指导设计，最后对长螺旋钻孔压灌混凝土桩的分项系数进行研究，简化了上述极限状态方程，提出完全可靠性分析和不完全可靠性分析下分项系数的确定方法， 探讨了目标可靠指标、荷载效应比、活载效应对各分项系数的影响，使该桩型在设计时分项系数的取值有据可依。