基于正交试验设计的车站基坑开挖对邻近既有铁路的影响分析

Impact Analysis of Station Foundation Pit Excavation on Adjacent Existing Railway Based on Orthogonal Experimental Design

以既有线的轨道水平作为控制标准,依托大庆西站基坑工程,在已有的相关测试数据的基础上,研究了选取不同基坑支护参数时,基坑开挖对基坑旁既有线轨道水平的影响。运用有限元软件对基坑支护形式等影响因素进行正交优化分析,根据极差和方差分析方法,确定了临近既有线轨道水平的影响因素的重要性顺序。分析结果表明:临近既有线轨道水平的影响因素的重要性顺序依次为桩长、锚固段长、锚索刚度、预应力大小、桩直径、锚杆倾角,桩间距。

Taking the track level of existing railway as the control standard,based on Daqing West Station foundation pit engineering,on the basis of the existing related test data,the influence of foundation pit excavation on track level of existing railway was studied when different foundation pit supporting parameters were selected. The finite element software was used to perform an orthogonal optimization analysis on influence factors of foundation pit supporting form. The range and variance analysis method were used to confirm the order of importance of factors affecting the track level of the existing railway. The analysis results showed that important factors affecting the track level of the existing railway were listed as followed： pile length,anchoring segment length,anchor cable stiffness,prestress,pile diameter,anchor inclination and pile spacing.