地基加固成桩对邻近高速铁路变形影响研究  

A Study on Impact of Foundation Reinforcement Piles on Deformation of Adjacent High-speed Railways

作　　者：梁金平 LIANG Jinping(Lunan High Speed Railway Co.,Ltd.,Jinan 250101,China)

机构地区：[1]鲁南高速铁路有限公司,济南250101

出　　处：《高速铁路技术》2023年第5期13-17,87,共6页High Speed Railway Technology

摘　　要：为评估新建线路地基加固成桩过程对邻近既有线路基的扰动影响,通过开展现场试验,研究了预应力管桩成桩过程对临近区域土体的变形分布与发展规律的影响,以及不同成桩距离对临近区域土体位移的扰动影响规律。结果表明:(1)试验预应力管桩成桩区(Ⅵ区)距离试验区边界1 m、5 m、8 m处测点地表最大横向水平位移依次为14.2 mm、12.3 mm、10.1 mm,最大纵向水平位移依次为10.1 mm、2.8 mm、2.6 mm,表明随着距离的增加,地表水平位移量减小;(2)预应力管桩成桩区(Ⅵ区)距离试验区边界1 m、5 m、8 m处地表隆起依次为1.7 mm、1.6 mm、0.7 mm,表明距离试验区边界越远,隆起位移越低;(3)试验预应力管桩成桩区(Ⅵ区)地表横向水平位移最大值约为14.8 mm,在地表以下5 m、15 m、25 m处横向水平位移约为12.0 mm、9.7 mm、3.9 mm,表明深层水平位移随深度递减。In order to evaluate the disturbance effects of the foundation reinforcement pile construction process for a new railway line on the adjacent existing railway subgrade,field tests were conducted to study the deformation distribution and development characteristics of the nearby soil caused by the prestressed pipe pile construction.The study focused on the impact of different pile distances on the disturbance of soil displacement in the adjacent area.The results show that:(1)The maximum lateral horizontal displacement of the ground surface at the measurement points located 1 m,5 m,and 8 m from the boundary of the test area in the prestressed pipe pile construction zone(Ⅵzone)is 14.2 mm,12.3 mm,and 10.1 mm,respectively.The maximum longitudinal horizontal displacement is 10.1 mm,2.8 mm,and 2.6 mm,respectively,and the increase in distance leads to a decrease in horizontal displacement.(2)The ground surface uplift at distances of 1 m,5 m,and 8 m from the boundary of the test area in the prestressed pipe pile construction zone(Ⅵ zone)is 1.7 mm,1.6 mm,and 0.7 mm,respectively,and the uplift displacement decreases with increasing distance.(3)The maximum lateral horizontal displacement of the ground surface in the prestressed pipe pile construction zone(Ⅵ zone)is about 14.8 mm,and the lateral horizontal displacement at depths of 5 m,15 m,and 25 m below the ground surface is approximately 12.0 mm,9.7 mm,and 3.9 mm,respectively.The deep horizontal displacement decreases with depth.

关 键 词：高速铁路 预应力管桩 水平位移 地表隆起 深层位移 

分 类 号：U213.1[交通运输工程—道路与铁道工程]