上拔与水平力组合作用下单桩静载试验

通过现场单桩水平静载荷试验及上拔与水平力组合作用下单桩静载试验,分析了水平荷载作用下不同桩身抗弯刚度灌注桩的变形特性和承载特性,探讨了有、无上拔荷载作用两种情况下单桩水平承载力及变形之间的差异。结果表明:桩身抗弯刚度的大小是影响单桩水平承载力及水平位移、桩顶转角的一个重要因素;当水平荷载较小时,与水平荷载同时作用的上拔荷载对桩的水平位移及桩顶转角无较大影响;而当水平荷载较大时,上拔荷载的主要影响在于降低桩周土体的强度,使得土体的水平位移增大。

Static lateral loading tests of single pile combined uplift load with lateral load

Based on the full-scale in-situ tests with static lateral load and on the static lateral loading tests of single pile combined uplift load with lateral load, the deformation and bearing capacity behaviors of the drilling bored concrete piles which have different bending rigidity are analyzed, and the difference of the lateral bearing capacity and lateral displacement of single pile loaded laterally with uplift loads or without the uplift loads are discussed. The results indicate that the bending rigidity is the key factor which affects the lateral bearing capacity, the lateral displacement and the turning angle of single pile, and that the uplift load combined with lateral load has less effect on the displacement and turning angle when the lateral load is lower, while the main affect of the uplift load is reducing the strength of soil and increasing the lateral displacement when the lateral load is higher.