复合荷载作用下静钻根植桩承载特性试验研究

Experimental Research on Bearing Properties of Static Bored Precast Concrete Pile Under Composite Load

竖向荷载和水平荷载的相互作用对桩的承载力的影响较为复杂,在桩基础设计中通常不考虑二者的共同作用,分别确定桩的竖向和水平承载力,不能完全反映桩的真实受力状况。通过现场试验,对预先施加竖向荷载的静钻根植桩再施加往复循环水平荷载,并结合单向多循环水平静载试验及竖向抗压静载试验,研究复合荷载作用下该桩的水平承载特性,结果表明预先施加的竖向荷载有利于提高静钻根植桩的水平承载力,当竖向荷载接近最佳竖向荷载时水平承载力的提升效果明显。

The interaction between vertical load and horizontal load makes a complex impact on the bearing capacity of pile foundation, which has been ignored by designers to ascertain the vertical and horizontal bearing capacity. In order to confirm the impact of composite load on the horizontal bearing capacity of static bored precast concrete pile , in- situ test is conducted, with reciprocating circular horizontal load applied on the side of pile top while vertical load applied on the pile top. Comparison is made between the composite load test and the horizontal load test without vertical load, and it indicates that the pre- applied vertical load makes an increase on the horizontal bearing capacity of static bored precast concrete pile, especially when the ratio of vertical load to the ultimate bearing capacity is the optimum ratio.