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研究桩基的深度效应是为了得到较好的技术和经济指标。扩底桩一直被视为大直径桩进行研究,然而,由于有扩大头,扩底桩的受力变形性能、破坏状态与普通大直径桩既有相同点又存在较大差异,参照大直径桩方法研究扩底桩深度效应不适合。研究扩底桩的深度效应,应针对扩底桩的特点,考虑桩长对端阻力发挥的影响。本文采用数值方法分析桩长对扩底桩技术经济指标的影响,统计合肥地区95根扩底桩试验数据,分析统计结果,得到端阻力分配比例与桩长的关系,提出扩底桩临界设计桩长建议值,最后通过一组扩底桩试验数据验证该建议值的有效性。
Studying the depth effect of pile foundation is to get better technical and economic indexes. However, due to the expansion and expansion of the bottom of the pile of the force and deformation of the failure state and the common large diameter pile both the same point and there is a big difference, with reference to the large diameter pile Method to study the depth effect of expanded pile is not suitable. In order to study the depth effect of expanded pile, the influence of pile length on end resistance should be considered in view of the characteristics of expanded pile. In this paper, the numerical method is used to analyze the technical and economic indexes of pile with enlarged bottom piles. Statistics are made on the data of 95 pile-enlarged piles in Hefei area. The relationship between the distribution ratio of end resistances and pile length is analyzed. Long recommended value, and finally validates the validity of the proposed value through a series of test data of expanded pile.