山区高速铁路隧道内电气化过轨研究

接触网专业在山区高速铁路隧道内分区所、AT所设置的情况下需要设置大量的过轨管。本文结合云桂铁路隧道内分区所、AT所的设置方案．探讨隧道接触网过轨管的布置。     

Determination of non-methane hydrocarbon emission factors from vehicles in a Tunnel in Seoul in May 2000

Measurements of non-methane hydrocarbons (NMHC) were performed at the entrance and exit of the Sangdo tunnel to estimate emission factors (EF) of NMHC from vehicles in May 2000. About 50 species were analyzed by a combined GC/FID and GC/MS system. Ethylene was the most abundant compound, followed by n-butane and acetylene, respectively. Based on the measurement data, the real world vehicular EF in Seoul was estimated. The highest EF value was 89.8 mg (veh-mile)^-1 for n-butane, followed by ethylene and toluene.     

基于Linux平台的校园VPN应用

本文针对校外教工访问校园网资源的需要,构建了基于Linux的VPN系统,并在此基础上运用流行的网络语言PHP和数据库系统MYSQL设计了VPN用户的管理系统,运用Iptbales表对用户的访问进行有效的控制。构建于公共网络之上的校园虚拟专用网既可以实现安全、快捷传递信息的需求,又可以为学校节省大量的开支。     

地质雷达在某公路隧道地质超前预报中的应用

本文介绍了地质雷达的基本工作原理,并以某高速公路隧道建设为例,简述地质雷达在隧道地质超前预报过程中的应用,说明地质雷达在隧道短期地质超前预报中的实用性、有效性和安全性,能提供更准确的地质信息和科学依据,更好地指导施工。     

IPv6过渡技术研究

随着当前互联网的飞速发展,当前使用的基于IPv4网络协议下的地址数显得越来越匮乏,因此IETF提出用IPv6协议取代IPv4协议。IPv6具有诸如海量地址、组播、邻居发现、自动配置等许多新特性。然而,怎样实现IPv4向IPv6的平滑过渡,以及怎样在现有IPv4网络上进行IPv6组网仍然是目前有待解决的问题。本文对目前常用的三种过渡技术双协议栈、隧道和地址翻译机制进行分析比较。     

海底隧道智能照明调光控制的效果分析

本文以厦门翔安海底隧道右线隧道YK6+559~YK12+610为例,介绍了智能照明调光控制连续光带,并结合实际照明效果和测试分析加以验证,得出智能照明调光控制方案的可行性,保证良好的隧道照明效果。     

Resilience analysis of shield tunnel lining under extreme surcharge: Characterization and field application

A resilient system should have the ability to mitigate the disruption caused by unfavorable environment and to rapidly recover to an acceptable performance level. In this paper, a detailed model to assess resilience of shield tunnel is presented. The performance robustness under disruption and the subsequent recovery rapidity are emphasized in this model. The tunnel horizontal convergence is selected as the performance indicator. The resilience index (Re) is defined by the ratio of the integral of the performance transition function over the integral of the normal performance function. The rationality and applicability of the model is validated by a real case of extreme surcharge on Shanghai metro tunnel. In this case, the performance transition and the normal performance degradation are characterized by the measured data. 70–80% of the normal performance is disrupted due to the surcharge, but only 1% is recovered by unloading of the surcharge in 9 days and 12.4% is recovered after 4 years by the soil grouting in 38 days. It results in a resilience index (Re) between 0.28 and 0.45. The lesson learned from the case indicates that the high vulnerability of lining convergence due to the severe surcharge and the long time duration between recovery measures could result in weak resilient abilities for shield tunnels. The value of resilience index Re could be significantly increased by 73% on average if the recovery duration were shortened.     

Extending the Q system's prediction of support in tunnels employing fuzzy logic and extra parameters

Rock mass classifications predict support measures according to expert rules by rating rock mass and taking into account the span of the opening. A similar procedure is adopted, in this work, and computerized using statistics and fuzzy logic. Fuzzy expert systems are trained with data of previously constructed underground openings. Using subtractive clustering the systems have the intelligence to pick up the relations between input and output and define the rules that represent the system's behavior automatically. These systems are found to predict support to be used more successfully than the Q system. With the introduction of extra input variables, which are important in numerical analysis, such as depth and intact rock strength, an extended fuzzy system is developed. This system is suggested for preliminary use as it is able to predict support even better.     

软弱破碎矿岩巷道支护技术研究

通过对四川泸沽铁矿大顶山矿区软弱破碎地段巷道变形失稳机理的分析，对该矿的矿岩进行分类，采用分级支护等措施，对该矿井巷支护技术进行了优化，大大提高了成巷率，为矿山生产创造良好条件。     

西曲矿盘区巷道布置方案研究

通过对原有盘区巷道布置研究分析，提出适应西曲矿现有争件的最佳方案，以降低成本、提高效率，推动新技术应用和矿井发展。