两种桩型受荷性能对比现场试验研究

通过对具有相同直径和长度的PHC预应力管桩和混凝土钻孔灌注桩的单桩竖向抗压静载荷试验及单桩水平静载荷试验,分析两种桩型在竖向受荷和水平受荷下情况下的桩顶变形以及承载能力。研究结果表明,两种不同桩型的竖向受荷性能差别不大,PHC管桩的竖向承载力要略大于灌注桩;PHC管桩的水平向承载力与灌注桩几乎相同,但水平向位移要略小于灌注桩的位移,由此计算得到的地基水平向抗力比例系数m也就略大于灌注桩的m值。

COMPARISON OF BEARING PERFORMANCE OF TWO TYPES OF PILES BY FIELD LOAD TESTS

Through single pile vertical resistant to vertical static load experiment and single pile horizontal static load experiment on PHC pre-pressed pipe pile and bored pile with the same diameter and length, this paper analyzed pile head deformation and bearing performance of the two kinds of piles under the circumstances of vertical load and horizontal load. The results indicate that, the vertical load bearing performance differs little between the two piles. PHC pre-pressed pipe pile has a little more vertical bearing capacity than bored pile, while it has nearly the same horizontal bearing capacity with bored pile, with a little less horizontal deformation. Hence the level resistance coefficient ratio of foundation m calculated from PHC pre-pressed pipe pile is a little higher than bored pile.