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依托中国2010年上海世界博览会B片区地下空间工程,进行11组旋挖扩底抗拔桩静载荷试验,并测试桩身轴力。选取持力层分别为黏性土和砂土的1#试桩和11#试桩来探讨扩底抗拔桩的受力机理。试验得出,最大加载量下扩底抗拔桩桩身变形量占桩顶变形比例可达80%,并采用数值分析拟合试桩曲线,分析不同持力层的扩底段受力特点,发现扩底抗拔长桩对桩周土体应力的影响范围为径向1倍扩底段长度、纵向沿桩端向上2倍扩底段长度。
Relying on the project of the underground space in Area B of Shanghai World Expo 2010, 11 sets of static load tests of the screw-up and bottom-up pile are carried out and the axial force of the pile body is tested. The 1 # test pile and 11 # test piles with cohesion soil and sand soil were selected to study the mechanism of stress on the enlarged bottom piles. The results show that the deformation ratio of the enlarged bottom uplift pile accounts for up to 80% of the pile deformation under the maximum loading, and the curve of the pile - testing curve is fitted by numerical analysis to analyze the force characteristics of the extended bottom section of different bearing strata. It is found that the influence range of the enlarged bottom pull-out long pile on the soil around the pile is that the length of the extended bottom section is 1 time of the radial direction and the length of the extended bottom section is 2 times of the vertical extension along the pile end.