柔性基础下复合地基有效桩长计算方法研究

Study on Effective Pile Length of Composite Foundation under Flexible Foundation

采用Boussinesq和Geddes解的联合求解方法,得到了考虑复合地基中桩顶和桩间土顶荷载时复合地基中任意深度处附加应力的分布情况;并根据柔性桩、桩间土和复合地基沉降关系,得到了带垫层柔性桩复合地基有效桩长计算方法.试验和计算结果对比表明:由于考虑了桩间土顶压力、桩身刺入量变形等因素对复合地基有效桩长的影响,有效桩长计算结果同现场实际情况比较吻合.

Based on the Geddes and Boussinesq stress solutions and thinking of loads on the surface of pile and soil,the distribution of additional stress in any place of composite foundation is found in paper. Furthermore,based on the dispacement relationship among pile,soil and composite foundation,a formula for calculat- ing effective length of flexible pile composite foundation with cushion has been got. Tcalculation results of this method are very consistent with those measured in the site.