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中文摘要：
以国内习惯采用的s-lg t失效准则为基准,给出了不同失效准则下单桩承载力的目标可靠度和安全系数的计算方法.算例分析表明：利用不同的失效准则确定出的目标可靠度和安全系数不同,且相差较大,但是桩基安全性并没有发生变化,只是采用的衡量标准不同.桩基设计时,首先要确定所采用的失效准则,利用不同的失效准则得出的设计参数是不同的.
英文摘要：
A bias factor defined with respect to s-lgt criterion usually used in China was introduced. The calculation formula of target reliability index of bearing capacity of single pile and factor of safety were presented using bias factor. The results through the case study indicate that the target reliability Indices and factors of safety are various with different failure criterion, and the difference is relatively larger, but the safety of pile group foundation is not variable due to different criteria used to judge. Therefore, before designing pile foundation, the failure criteria should be chosen firstly, and various design parameters can be obtained according to different failure criterion.
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