抗液化微型钢管群桩理论研究

Theoretical Study on Anti-Liquefaction Micro Steel Pipe Piles

随着电网建设快速发展,输电线路走廊日益狭窄,线路经常途经饱和砂土或饱和粉土地段,国内目前主要采取灌注桩穿过液化层,防止土体液化。通过分析地震液化机理和微型钢管群桩的受力特性,提出了输电线路途经地震液化场地时采用抗液化微型钢管群桩基础的方法,并通过实际工程与普通单桩进行对比分析,得出抗液化微型钢管群桩对土体有加固和提高抗液化剪应力的作用,并且具有较大的经济效益,极具推广价值。

With the rapid development of power grid construction,the transmission line corridors are increasingly narrow,and the lines pass through saturated sand or saturated powder.At present,the domestically adopted piles are mainly used to pass through the liquefaction layer to prevent soil liquefaction.By analyzing the mechanism of earthquake liquefaction and the stress mechanism of micro pile group,this paper concludes that anti liquefaction micro steel pipe pile can strengthen soil and improve anti liquefaction shear stress.It is proposed that anti liquefaction micro steel pipe group pile foundation should be adopted in the earthquake liquefaction site where the transmission line passes through.Through the comparison and analysis of actual engineering data and ordinary cast-in-place pile,the anti liquefaction micro steel pipe group pile is obtained.It has economic benefits and promotion value.