列车运行引起周边环境振动的监测与分析

利用振动传感器和测试仪器在某铁路线旁的小区对列车运行经过时引起的三个方向振动速度以及振动频率进行实测。通过对监测数据分析发现,其振动衰减规律的分析结果与通过监测列车运行引起振动加速度的分析结果是一致的。同时参考《爆破安全规程》中的相关安全允许振动速度标准以及运用"振动感觉与振动持续时间关系"的相关理论,确定了评价列车运行引起建筑物振动的安全允许振动速度,为评价轨道交通系统运行对邻近建筑物振动危害提供了一个新思路;最后,指出小幅度长久持续的振动对建筑物的破坏是不能被忽视的,需要进一步研究并采取合理措施来控制和减弱其危害。     

兰州黄河高阶地复杂地质大断面隧道监控量测

兰州地区黄河阶地是国内最为典型的河流阶地,地质条件复杂。本文结合兰新第二双线兰州枢纽引入工程孔家营隧道施工,选择典型断面(阶地黄土地层、阶地黄土圆砾土地层、阶地圆砾土软岩地层、阶地黄土圆砾土软岩地层)对该隧道施工进行全面、系统监控量测,对比分析了各种地质条件下的大断面隧道的应力变形特征。结果表明,不同地层组合隧道围岩稳定性具有较大的差别,尤其是隧道拱顶存在圆砾土时其稳定性最差;阶地隧道存在较明显的偏压现象,二衬可以很好地控制偏压对隧道稳定性的影响。     

地铁列车DC 110V电路接地设计

对地铁列车DC 110V信号线接收电路的抗干扰设计进行了分析,并对几种DC 110V负线接地方法进行了研究,指出了各种接地方法的优缺点,推荐了一种较好的负线接地方法,并提出了DC 110 V屏蔽电缆屏蔽层的接地设计方法.     

山区软岩大跨大断面四线铁路车站隧道二衬施工技术研究

对大跨大断面隧道,特别是在浅埋且围岩地质条件较差的情况下,为保证隧道衬砌施工过程中的安全,尽可能采用整体衬砌。以位于贵昆线六盘水至沾益段增建二线工程上的乌蒙山二号隧道出口四线车站隧道为例,结合现场实际施工,对山区软岩大跨大断面四线隧道整体二次衬砌进行了研究,所得成果可为今后类似工程提供参考。     

地铁屏蔽门绝缘安装相关问题探讨

论述屏蔽门在城市轨道交通系统中的重要作用,指出需要高度重视屏蔽门的接地和绝缘系统的可靠性。通过分析目前城市轨道交通站台屏蔽门系统的绝缘结构,阐述其在施工、运营中存在的问题,提出相应的处理建议和措施,包括确定合理的绝缘指标、尽量避免外界干扰、加强施工质量控制等。     

谈铁路混凝土梁桥面防水

论述了桥面水对混凝土桥梁的危害,论证了设置桥面防水系统的重要性,提出了桥面系构造必须注意的要点,并介绍部分桥梁防水层的施工方法。     

Research on the Design of Career Development Channel for Employees in Large State-owned Construction EnterprisesEI北大核心

Research purposes: From the factors and the principles the enterprise employees' career development design should consider, this paper studied and further discussed channel setting, the division of hierarchy and width, positions or proportional control of all levels, qualification criteria of all levels to determine, career development path management, to solve the problems of the large state-owned construction enterprise, such as narrow development channel, less promotion platform, and insufficient continuous motivation of professionals, technical operators, and general management personnel, resulting in employees no passion, no fighting will, not dedicated, difficult to bring in talents and high attrition rates of talents. Research conclusions:(1) The design of employees' career development should consider four aspects: attractiveness, operability, practicality and pertinence. (2) The design of employees' career development should follow the principles of systematic, overall and long-term development. (3) The design of career development channel should be mainly considered from the aspects of post setting, channel hierarchy and width division, and job qualification criteria. (4) The research results can provide a reference for the design and research of career development channels for employees in state-owned construction enterprises. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

A New Technique of High-performance and Fast Tensioning Prestressed Anchorage CableEI北大核心

Research purposes: The large-span transition section tunnel of the Badaling Great Wall station on the Beijing-Zhangjiakou high-speed railway with the maximum excavation width of 32.7 m, and the largest excavation area of 494.4 m 2 , is the world's biggest traffic tunnel in the world with the largest excavation width and excavation area, which has difficult construction and high security risks. The initial support system of tunnel is mainly realized by prestressed bolt, prestressed cable and shotcrete. After test, anchor cable tension using the traditional anchor cable construction technology can't meet the design requirements, at the same time, it takes about 30 days to achieve prestressed tensioning. Therefore, we need to study the high-performance fast tensioning prestressed anchor cable technology, to effectively control surrounding rock deformation, to ensure the safety of construction, improve construction efficiency. Research conclusions:(1) The traditional anchor cable construction technology is adopted. The anchor cable tension value is mainly controlled by the grip force between the anchor rope and grouting body and the cohesive force between grouting body and surrounding rock. (2) The grip force between the anchor rope and the grouting body can be increased by about 2 times by increasing the "barb"; The cohesive force between the grouting body and the surrounding rock can be increased by 1.5 times by 6 ~ 7 MPa high-pressure grouting process. (3) The modified sulphoaluminate cement slurry can reach more than 30 MPa within 1 day of the slurry strength, so as to realize fast anchor cable tension within 1 day after grouting completion. (4)The research results can be used for reference in similar prestressed anchorage cable construction projects. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

CTCS-3级列控系统CSD数据传输处理过程及延时性能分析

阐述了列控CSD数据传输在CTCS-3级列控系统中的应用与意义,介绍了CSD传输延时的定义以及铁路应用的指标要求,描述了CSD数据传输处理过程,分析了CSD延时的产生原因与分布情况,针对传输系统保护倒换、R接口不同的串口通信速率,以及不同的空口用户速率、用户数据帧长度给出了实测数据。     

红神铁路格丑沟特大桥拱桥空间稳定性分析

以格丑沟特大桥136m钢管混凝土拱桥为研究对象,采用MIDAS有限元分析程序,建立空间有限元计算模型,得出常见的失稳屈曲模态;分析横撑样式及布置位置对拱桥稳定性的影响,为该桥的设计、施工、监控及维护提供参考。