砂质高边坡路堑工程双排桩支护结构数值分析

针对川藏铁路某风积砂高边坡路堑工程中“双排桩+植筋挡土板”支挡结构的设计，运用理论分析和数值计算方法，对双排桩设计方法、结构形式、桩间距等主要问题进行了研究。结果表明:单位宽度设桩数量不变时，矩形布桩在结构受力、抵抗变形、桩-土作用方面均优于梅花形布桩；桩间距取2~4倍桩径时，桩间土拱效应显著，桩间土加固效果好；连接钢筋最大轴力位于两端，应采取加强措施。

Numerical Analysis of Double-row Pile Support Structure of Sandy High Slope Cutting Project

In view of the design of the retaining structure of “double-row pile+planting reinforcement retaining plate” in the cutting project of a high slope of aeolian sand in Sichuan—Tibet Railway, the design method, structure form and pile spacing of double-row pile are studied by theoretical analysis and numerical calculation. The results show that when the number of piles per unit width is fixed, the rectangular pile is superior to the plum shaped pile in terms of structural stress, deformation resistance and pile-soil action. When the spacing between piles is taken as 2D~4D, the soil arch effect between piles is significant and the reinforcement effect between piles is good. The maximum axial force of the connecting bar is at both ends, which should be adopted strengthening measures.