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科学合理地确定各种桩基的设计承载力值一直是工程和学术界研究的重点。通过调整安全系数的取值,以获得安全有效的承载力设计值,将大大简化扩底桩的设计工作。通过对某工程2根“扩底桩”基础试验资料的分析,研究“扩底桩”受力过程中端阻力、侧摩阻力的发挥情况。研究表明:“扩底桩”桩长越大,侧摩阻力占总承载力比例越大,端阻力占总承载力比例越小。结合合肥地区95根“扩底桩”试验数据的分析统计结果,建议在合肥地区设计“扩底桩”基础时,可根据桩长的不同取不同的安全系数,并给出相应的安全系数设计建议值。
Scientifically and rationally determining the design bearing capacity of various pile foundations has always been the focus of engineering and academic research. By adjusting the value of the safety factor to obtain a safe and effective design value of the bearing capacity, the design of the expanded pile will be greatly simplified. Through the analysis of 2 foundation test data of a project, this paper studied the application of end resistance and side friction in the process of “bottoming pile”. The results show that the larger the pile length is, the greater the ratio of side friction to total load is and the smaller the ratio of end resistance to total load is. Based on the statistical analysis of the 95 “” underpinning pile test data in Hefei, it is suggested that different safety factors should be taken according to the length of the pile when designing the foundation of " The recommended safety factor design value.