铁路隧道底鼓风险等级划分方法及控制措施研究

Study on Risk Level Classification Method and Control Measures for Railway Tunnel Floor Heave

高速铁路隧道仰拱底鼓问题会严重影响无砟轨道列车的运行速度及安全。为准确定量评价铁路隧道底鼓的风险程度,通过对国内多座铁路隧道底鼓变形的调研分析,结合未确知测度理论与改进层次分析法,对设计与运营阶段铁路隧道底鼓风险等级划分以及控制措施进行研究。考虑地质环境、隧道结构特征及底鼓特征等因素,在隧道设计阶段确定包含5个一级指标和11个二级指标的底鼓风险等级划分体系,在隧道运营阶段确定了包含6个一级指标和15个二级指标的底鼓风险等级划分体系;根据铁路隧道底鼓病害风险程度,铁路隧道底鼓风险等级分为Ⅰ、Ⅱ、Ⅲ和Ⅳ级,基于隧道底鼓风险等级以及各指标对底鼓的影响规律,建立了铁路隧道底鼓风险等级评价方法及流程;针对设计和运营阶段铁路隧道底鼓风险等级,建立了相应的底鼓控制综合措施。

In recent years,the invert floor heave problem in high-speed railway tunnels has become prominent,which has seriously affected the running speed and safety of trains on the ballastless track.In order to accurately and quantitatively evaluate the risk level of railway tunnel floor heave,a study is conducted on the classification of risk levels and control measures for railway tunnel floor heave during the design and operation stages through investigation and analysis of floor heave deformation of some railway tunnels in China and in combination with the unascertained measure theory and the improved analytic hierarchy process.The research results indicate that,considering these factors such as geological environment,tunnel structural characteristics and floor heave characteristics,a risk level classification indicator system of floor heave including 5 Level I indicators and 11 Level II indicators is determined in the tunnel design stage;another risk level classification indicator system of floor heave including 6 Level I indicators and 15 Level II indicators is determined in the tunnel operation stage;According to the risk degree of railway tunnel floor heave defects,the risk levels of railway tunnel floor heave are divided into Level I,II,III and IV.The risk level evaluation method and process of railway tunnel floor heave are established based on the risk level of tunnel floor heave and the influence law of each indicator on floor heave;corresponding integrated control measures are prepared for the floor heave risk levels of railway tunnels during the design and operation stages.