现浇薄壁管桩水平受力特性试验研究

Behaviors of PCC pile under lateral loading lest

现浇薄壁管桩(Cast-in-place Concrete Thin-wall Pipe Pile,简称 PCC 桩)作为一种新型桩基础,已在很多地基处理工程中得到应用,但有关其水平承载性的研究还很少。通过现场试验,对水平荷载下PCC桩的水平承载性、泥面处桩荷载.位移关系、桩周土压力变化以及桩侧地基水平抗力系数的比例系数 m 与位移关系等特性进行初步分析,同时对单向多循环加载和慢速维持荷载两种加载方式对桩受力特性的影响进行比较。试验表明,PCC 桩有较好的水平承载性,在水平荷载下.PCC 桩的受力主要集中在桩的上部:与慢速维持荷载法相比,单向多循环法对桩的水平承载性以及桩土作用的非线性影响较大。

As a new kind of pipe pile,the cast-in-place concrete thin-wall pipe pile,referred to as PCC pile,with a large diameter,has been used in many engineerings to improve the soft ground;but the bearing capacity under lateral load hasn't been studied well. Through the in situ test,the authors analyze the horizontal bearing capacity,the pile displacement and the soil pressure around the pile under lateral load.In addition,the effect of the repetitious loading pattern on the pile-soil interaction is also given.All tests show that the PCC pile can be provided with preferable horizontal beating capacity;and the force act on the PCC pile mainly fast on the upper part;at last,the analysis also shows that the one-way cyclic loading has much effects on pile lateral capacity and the nonlinearity of pile soil interaction.