风洞动力PLC监控系统的研制

结合 8 m× 6 m风洞动力系统的改造 ,充分利用动力系统的设备、部件 ,采用 PL C控制器 ,基于 S7-STEP7和 FIX32编程环境 ,开发研制出动力监控系统 ,从而实现了 8m× 6 m风洞动力系统的智能监控。文章系统地叙述了 8m× 6 m风洞动力监控系统的硬件结构 ,软件设计原理和方法 ,系统的功能以及达到的效果     

黄土隧道施工控制要点总结

结合郑西客运专线黄土隧道施工实例，总结了一般黄土隧道施工控制的要点，实践证明：仰拱距掌子面距离不大于30m，二衬距仰拱面距离不大于30m是保证黄土隧道施工安全的强有力措施。     

武广客运专线某隧道塌方处理技术探讨

通过武广客运专线某隧道塌方处理的工程实例，介绍大断面软弱围岩隧道塌方处理的施工技术和步骤，以供在类似的隧道塌方处理中借鉴应用。     

隧道初衬质量无损检测与反馈

根据规范，对初衬混凝土质量从厚度以及背后空洞两个方面的检测方法、合格标准以及检测结果的反馈流程进行了描述，并在某隧道施工现场得到应用，较好地控制了初衬的施工质量。     

Deterioration of concrete in railway tunnel suffering from sulfate attack

For the sake of understanding the deterioration behavior of concrete in actual railway tunnel structures subjected to aggressive sulfate medium in practice,detailed field investigations and tested analysis on sprayed concrete linings of approximately 40-year-old railway tunnels in environments containing sulfate ion were carried out,respectively.The results show that the deterioration of concretes in the investigated area is serious,which involves complicated physicochemical process between the sulfate salt...     

Temperature distribution within a ceiling jet propagating in an inclined flat-ceilinged tunnel with natural ventilation

In this study, we conducted detailed measurements of the temperature distribution within a steady fire-driven ceiling jet, formed in a tunnel with a rectangular cross-section. We then compared the measured temperature distributions with those for an unconfined smooth-ceiling jet flow, and estimated the relative errors between them. The results showed that the temperature distribution in a horizontal tunnel exhibits a greater bulge than that of a ceiling jet under an unconfined ceiling and varied from a bulging shape to an exponential shape as the tunnel inclination increased. We propose a new correlation for representing the temperature distribution, which takes the tunnel inclination into account, and which consists of an exponential function and a cubic function with a coordinated transformation.     

公路联体隧道中导洞塌方处理及预防

结合浙江诸永高速公路杨家联体隧道中导洞塌方施工，介绍了在联体隧道中导洞塌方处理时遇到的技术难题及其解决办法，并提出施工中应注意的问题及相应的预防措施，以期指导实践。     

尾矿库排洪主隧洞工程爆破实践

介绍了本溪南芬选矿厂第二尾矿库排洪主隧洞工程爆破施工情况,并对工程爆破实践经验进行了总结,认为爆破填塞质量、最小抵抗线控制、炸药单耗选取、关注细节是取得爆破成功的关键.     

谈羊角脑隧道突水、突泥治理措施

以羊角脑隧道为例，介绍了采取地质超前预报、加强监控量测、采用恰当的材料和方法进行封堵以及采取合理的支护和开挖措施等多措并举、多管齐下相结合的综合治理措施，是成功治理隧道突水、突泥灾害的关键。     

高压钠灯照明节电新系统

城市道路照明改由单相变压器供电,组成V/V0-V/V单相变压器-高强度气体放电灯节电照明系统,可以收到单相变压器节电、下半夜路灯自动降压节电的双重节电效果。