海淤地质条件下钢管混凝土桩抗拔系数试验研究

Experimental Study on the Anti-Evulsion Coefficient of Concrete Filled Steel Pipe Piles under the Condition of Sea Sediment

通过连云港220kV云台变电所基础加固模拟试验,测得海淤地基中钢管混凝土桩的抗拔系数λ约为0.65,明显小于《建筑桩基技术规范》(JGJ94-94)中一般粘性土地基条件下的λ值,并对钢管混凝土的焊接连接接头进行了抗拉试验研究,本文可为软土地基条件下钢管桩和钢管混凝土桩抗拔设计提供参考。

The anti-evulsion coefficient （ λ ） of concrete filled steel pipe pile under the condition of sea sediment is about 0.65, which was surveyed by the simulation experiment of Lianyungang-yuutai transformer substation＇s foundation which was reinforced by the pile. It is evidently less than theλof common viscous soil prescribed by the Technical Code for Building Pile Foundations （JGJ 94-94）. The anti-evulsion experiment of welded joint of the concrete filled steel pipe is also studied. This paper can offer references for the anti-evulsion design of steel pipe pile and the concrete filled steel pipe pile under the condition of mild soil foundations.