长治县陶清河水库应急专项除险加固工程

以陶清河水库工程为例,介绍了水库的地理位置、区域环境等,针对工程现场检查发现的输水洞渗水严重的问题,对其原因进行了剖析,确立了解决方案,并阐述了具体的施工技术,指出及时排除输水洞存在的各种病险,对提高大坝的安全性、耐久性具有重要意义。     

使用Cisco路由器模拟测试IPv6隧道技术

IPv4向IPv6的迁移更好的解决了网络容量及网络性能。本文重点论述在Cisco路由器上如何模拟手动隧道及自动隧道两种传输方式,并就其工作原理和实现过程进行了较为详细的分析和概括。同时,对IPv6技术做了一定的预测。     

On the applicability of the laminar flow index when selecting surgical lighting

In modern operating rooms ultraclean air is supplied through the ceiling to prevent bacteria from entering an operating wound and cause infections. Operating lamps can disturb this flow of clean air. In this paper the accuracy of some aspects of the Laminar Flow Index of operating lamps was tested. The disturbance of the airflow was determined for different shapes and sizes of operating lamps in an isothermal situation. To accomplish this, an experimental study and a simulation study of a small room with an operating lamp were performed. The infection risk was found to be proportional to the projected surface area of the lamp. Although different lamp shapes resulted in a distinctly different flow pattern in the room, this did not affect the infection risk in a significant way. Operating lamps with a projected area smaller than 0.1 m² do not disturb the airflow at all in this particular setup.     

Improved analytical model for circumferential behavior of jointed shield tunnels considering the longitudinal differential settlement

Differential settlements of the shield tunnel along the longitudinal direction can significantly affect the circumferential behavior of segmental lining, degrading both the structure safety and serviceability. In this paper, the authors introduce both the shearing effect and flattening effect on the tunnel cross section, which was caused by the longitudinal differential settlement, into an existing analytical model of jointed shield tunnels. An example is then presented to illustrate the variation of the circumferential behavior of segmental lining, including both the structure safety and serviceability, along the longitudinal position. Finally, a series of parametric studies are performed to investigate how factors such as tunnel longitudinal settlement, property of surrounding ground, and the design parameters of segmental lining affect the circumferential behavior of the segmental lining.     

Upgrading the Arlberg tunnel to current safety standards

Austrian road tunnels within the Trans-European Road Network (TERN) must fulfil the requirements of the Directive 2004/54/EC (European Commission, 2004) not later than April 2019. This regulation has to be applied to all tunnels in the TERN with a length of more than 500 m, whether they are in operation, under construction or at design stage, and aims at ensuring a minimum level of safety for road users. One of the main features of this directive is the requirement for providing an egress possibility to a safe environment every 500 m throughout the whole tunnel.The Arlberg road tunnel has a length of some 15.5 km and is in operation for more than 35 years. It is a single tube tunnel operated with bi-directional traffic, but carries a quite low traffic volume. Hence, the construction of a second tube is not really cost effective. Currently the tunnel is equipped with a transversal ventilation system with remotely controlled smoke extraction dampers providing smoke extraction every 100 m. The maximum distance between egress possibilities to a save environment is some 1500 m. Due to the high costs of a construction of a second tube or a parallel running escape gallery, a novel solution was found. The existing fresh air duct will be used as safe escape way between the existing egress possibilities. This solution has big impacts on the ventilation system and on the requirements for thermal structure protection of the new egress ways, i.e. the fresh air duct. In order to overcome this problem, massive changes in the ventilation design have to be performed, accompanied by the installation of a high-pressure water-mist system for structure protection.     

天恒山大断面浅埋土质隧道"两台阶五步"施工技术

当前土质隧道的设计、施工方法很不成熟,导致在建土质隧道施工灾害频发.以在建的天恒山土质隧道为工程背景,针对严寒地区大断面浅埋土质隧道的特点,在改进并革新"三台阶七步"施工法基础上提出了适用于浅埋土质隧道的"两台阶五步"施工法,安全、经济、快速地穿越了天恒山软可塑状态的亚粘土地层.论文详细介绍了"两台阶五步"施工法的技术...     

突出矿井煤巷快速综掘

针对突出矿井半煤巷使用综掘机一直是国内煤炭行业的一大难题。总结了在突出矿井,且巷道支护又是架棚巷道的情况下,使用掘进机成效显著,提高了掘进进尺,缓解了采掘接替紧张的矛盾。针对现场实际,又对掘进机的个别部件进行了改进,提高工效,提出了突出矿井使用掘进机一些亟待解决的问题。     

消防系统供电设计探讨

本文通过对于《民用建筑电气设计规范》（JGJ16-2008）中有关消防系统供电章节部分条文的探讨和阐述，明确了部分消防供电系统的内容及方式，供设计人员在进行消防供电系统设计时参考和借鉴。     

层状岩体中地下工程复合衬砌模型试验研究

本文结合重庆市菜袁公路Ⅱ号隧道设计方案,对层状岩体中深埋隧道围岩及二次衬砌的受力状态、时间效应及破坏机理,进行了模型试验研究.试验结果表明,复合衬砌的破坏亦属剪切破坏;喷锚支护改善围岩的力学性能,提高抵抗变形的能力;二次村砌能起到支护结构的作用.     

广义的韦伯-费昔勒定律

本文提出广义的韦伯-费昔勒定律,证明这个定理能够用于评定建筑物的光照、建筑声学和建筑热环境。房间清晰函数、光照清晰函数和热舒适函数可以从这个定理导出。这些函数的计算结果和由世界上著名的研究者得到的实验曲线相吻合,可以设想这是一个普适的定理。