桩基础的静荷载试验最大加载值的确定

Determination of dead load test maximum load value of pile foundation

做单桩竖向抗压承载力静荷载试验时,在地基土对桩产生负侧阻和地震区存在液化土层且地震时液化土对桩的侧阻力减小的情况下,按常规做法确定单桩竖向抗压最大加载值得出的桩承载力特征值,其安全系数不满足规范要求,且在这种情况下按规范得出的单桩承载力特征值安全系数不够。经过分析,提出了解决上述问题的方法。

When carrying on dead load test for the compressive bearing capacity of a pile,under the routine condition that foundation soil produces negative skin friction on the side of piles,a stratum of liquefaction exists in seismic area,and the skin friction of the stratum of liquefaction to piles was reduced in earthquake,the safety factor of vertical bearing capacity characteristic value of single pile calculated as per the above practice to determine vertical maximum value of compressive loading on single pile can' t meet the requirement of the technical code.And under the circumstance,the safety factor of vertical bearing capacity characteristic value of single pile obtained as per technical code is not enough.Based on the analyses,the method to solve these preblems was proposed.