地下水作用致隧道底鼓和双块式无砟轨道变形规律研究  

Research on Deformation Laws of Tunnel Heaving Floor and Ballastless Track with Double-block Sleeper Caused by Groundwater

作　　者：张彩亮 刘秀波 柯在田 张玉芳 马帅 ZHANG Cailiang;LIU Xiubo;KE Zaitian;ZHANG Yufang;MA Shuai(China Academy of Railway Sciences Corporation Limited,Beijing 10008l,China;Infrastructure Inspection Research Institute,CARS,Beijing 100081,China;Railway Engineering Research Institute,CARS,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司,北京100081 [2]中国铁道科学研究院集团有限公司基础设施检测研究所,北京100081 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道建筑》2024年第6期1-8,共8页Railway Engineering

基　　金：中国国家铁路集团有限公司科技研究开发计划(K2022T002)。

摘　　要：水压作用会导致隧道底鼓变形,变形传递至轨道会引起轨道几何状态不良。本文从轨道几何形位变化角度出发,对水压力作用导致隧道底鼓时引发的轨道几何状态劣化问题展开深入研究,提出了水压力的近似计算方法;基于荷载-结构法建立了隧道内双块式无砟轨道数值计算模型,分析了不同找平层水压作用下轨道的几何不平顺特征和变化规律。结果表明:隧道底鼓-无砟轨道几何不平顺现象是道床板与找平层接触状态变化、沿线路纵向与隧道横断面内的横向变形叠加作用的结果;水压作用除引起轨道高低几何状态劣化外,还可导致轨道轨向、水平变化及扭曲变形;受承压水头和水压分布长度影响,水压引起的内外轨的高低、轨向以及轨道水平变化曲线具有各自形态特征,而并非单一抛物线或正弦线。通过数值模拟,验证了隧底找平层底鼓变形的接触状态非线性力学行为,揭示了底鼓变形下轨道线路三角坑的形成机理。The effect of water pressure can cause deformation of the tunnel heaving floor,and the transmission of deformation to the track can cause poor geometric state of the track.This article conducted in-depth research on the deterioration of track geometry caused by water pressure induced tunnel heaving floor from the perspective of changes in track geometry,and proposed an approximate calculation method for water pressure.A numerical calculation model for the ballastless track with double-block sleeper in a tunnel was established based on the load-structure method,and the geometric irregularity characteristics and variation rules of the track under the action of water pressure in different leveling layers were analyzed.The results show that the geometric irregularities of the tunnel heaving floor-ballastless track are the superimposed effect result of changes in the contact state between the track bed slab and the leveling layer,as well as the lateral deformation along the longitudinal direction of the track and within the tunnel cross-section.The action of water pressure can not only cause deterioration of the high and low geometric states of the track,but also lead to changes in the direction,horizontal orientation,and twisting deformation of the track.Due to the influence of pressure head and water pressure distribution length,the height,orientation,and horizontal variation curves of the inner and outer rails caused by water pressure have their own morphological characteristics,rather than a single parabolic or sinusoidal line.Through numerical simulation,the nonlinear mechanical behavior of the contact state of the heaving floor deformation in the tunnel bottom leveling layer was verified,and the formation mechanism of the triangular pit on the track under the heaving floor deformation was revealed.

关 键 词：高速铁路 隧道 数值模拟 底鼓变形 双块式无砟轨道 水压作用 轨道几何状态 

分 类 号：U213.213[交通运输工程—道路与铁道工程] U457[建筑科学—桥梁与隧道工程]