【作者】 马坤；

【导师】 宋波；

【作者基本信息】 北京科技大学 ， 土木工程， 2012， 硕士

【摘要】 本文依托国家高技术研究发展计划“高速铁路基础设施服役状态检测技术”项目，在归纳总结国内外各种隧道结构近接工程的基础上，根据工程实际研究了高铁隧道近接工程的影响机制及监测方法。采用数值计算、理论分析和经验类比方法，对高铁隧道近接开挖中的静力、动力问题进行了研究。本文的主要工作内容包括以下几个方面：（1）高速列车行驶引起的振动诱发附近结构物的响应，高铁隧道在动荷载作用下，将引起不均匀变形。采用高速列车-轨道动力相互作用模型，得到了列车振动荷载及加速度时程曲线。（2）分别采用5m、10m、15m三种近接距离的FLAC3D模型，进行了不同近接距离下不同深度的静力开挖，得到了不同类型近接开挖对高铁隧道变形的影响机制。（3）基于显式动力分析方法，将高速列车振动加速度时程输入到近接开挖静力计算模型中，分析了列车振动和近接开挖对高铁隧道的影响，得到了列车振动下隧道附加位移的变化规律。（4）以数值计算典型截面位移为依据，利用隧道沉降经验公式，得到了隧道位移包络曲线，作为高铁隧道近接工程全截面变形推测及监测点设置的依据。（5）通过高铁隧道近接工程的变形及应力计算结果分析，合理设置传感器监测点，建立高铁隧道近接工程监测系统，作为高速铁路基础设施服役状态检测系统的组成部分。更多还原

【Abstract】 This paper depends on the "monitoring technology of high-speed railinfrastructure in the service state" project, which belongs to National HighTechnology Research and Development Program (863). Based on summarizedvarious kinds of close-spaced engineerings of tunnel structure domestic andoverseas, the impact mechanism and monitoring method of high-speed railwaytunnel are studied in a project case. The static and dynamic influence onhigh-speed railway tunnel with close-spaced excavation are carried out by usingmethods of numerical calculation, theoretical analysis and analog．The following main researches were gained:(1)The vibrations of high-speed train induced response in the structurearound, high-speed rail tunnel under the dynamic load will emerge non-uniformdeformation. The train vibration load and acceleration time-history curve aregained through the train-track dynamic interaction model.(2)Three kinds of close-spaced distance5m,10m,15m were used inFLAC3D model, the models are static excavated with different depth. High-speedrailway tunnel deformation mechanism in different types of close-spacedexcavation has been presented.(3)The high-speed train acceleration time-history is applied in staticexcavation model based on explicit dynamic analysis.High-speed rail tunnelinfluenced by the train vibration and close-spaced excavation has been analyzed,and the variation of tunnel displacement under additional vibration has been got.(4)According to the typical cross-section displacement in numericalcalculation, the tunnel numerical calculation displacement envelope curve isobtained by settlement curve empirical formula.The curve regards as the basis offull cross-section deformation speculation and set of monitoring points.(5)The monitoring points in the tunnel reasonably set up through high-speedrail tunnel deformation and stress analysis under close-spaced engineering.The tunnel monitoring system has been established and served as acomponent of high-speed rail infrastructure monitoring system in the state.更多还原