摘要
采用现场钻探、调查等方法对高速铁路黄土隧道运营前洞口段轨道板上拱现象进行分析,研究轨道板上拱机理,并给出相应处理方案.分析结果表明:中心水沟渗漏导致地基土含水率增大是轨道板上拱的主要原因;隧底湿陷性新黄土受水浸泡软化,仰拱填充层开裂,明洞段受其两侧暗洞段与路基桩板纵向挤压作用产生隆起;受水浸泡后,寒季冻涨作用使轨道板上拱.整治前隧道进口洞门段轨道板上拱最大值为12.9 mm,采用旋喷桩对隧道仰拱底予以加固并采取隧道疏排水措施后上拱现象消失,说明该措施可有效控制轨道板上拱变形.
By on-site drilling,investigation and other methods,the phenomenon of track slab upwarp at the loess tunnel portal section of a high speed railway before operation was analyzed,the upwarp mechanism of track slab was studied and a related treatment scheme was proposed.The analysis results show that the increase in the moisture content of the foundation soil caused by central gutter leakage is the main reason for track slab upwarp.The new collapsible loess at the tunnel bottom is softened by water immersion,the filling layer of the invert is cracked,and the open-cutting section is arched by the longitudinal compression of the under-cutting section and the pile foundation of the roadbed.The frost heaving in cold season also makes track slab arch up after soaking in water.Before remediation,the maximum value of track slab upwarp at the tunnel entrance portal section is 12.9 mm.However,the upwarp phenomenon disappeared after using the jet grouting pile to reinforce the tunnel invert bottom and taking the tunnel drainage measures,which indicates that the measure can effectively control the upwarp deformation of track slab.
作者
王云杰
WANG Yunjie(Datong-Xi'an Passenger Dedicated Line Co.Ltd.,Taiyuan 030032,China)
出处
《铁道建筑》
北大核心
2020年第5期102-106,共5页
Railway Engineering
关键词
高速铁路
黄土隧道
隧道洞口
轨道上拱
上拱机理
处理方案
high speed railway
loess tunnel
tunnel portal
track upwarp
upwarp mechanism
treatment scheme
作者简介
王云杰(1967-),男,高级工程师。E-mail:wcloudj12@163.com。
