地质雷达在固结灌浆检测中的应用

以即将并网发电的乡城水电站引水隧洞固结灌浆工程为研究对象。采用以地质雷达为主,声波检测和钻孔压水检测为辅的多种检测手段对多种围岩条件下的引水隧洞固结灌浆工程进行质量检测。通过对雷达检测数据的处理,归纳出缺陷段和密实段固结灌浆雷达检测特征图像,并通过钻孔压水试验和声波检测试验对雷达图像加以验证。结果表明:声波检测结果与地质雷达图像有着一定的联系。而钻孔压水试验得到的透水率与雷达图像没有明显的联系。在综合考虑了检测结果后,初步提出地质雷达检测固结灌浆的质量标准:检测抽样段长度应不少于总长度的5%;衬砌背后无空洞现象;不密实段长度占检测段长度比率小于15%,且位置分布不集中。凡符合上述要求,灌浆质量可评为合格。     

科卡科多水电站引水隧洞灌浆加固方法

科卡科多水电站引水隧洞以火山岩和侵入岩为主,岩石性脆且易破碎。2014年1月TBM掘进过程中受多条断层破碎带的影响而发生卡机故障,为了使TBM脱困,施工方对断层破碎带内的围岩进行了灌浆加固处理,开挖辅助作业洞,选择GU超细水泥浆和YDS-40高渗透环氧化学材料进行复合灌浆,灌浆结束后通过钻芯检查进行质量评价,通过灌浆加固围岩,使TBM顺利脱困,掘进工作得以继续进行。     

Global asymptotical synchronisation in linearly coupled networks of RCL-shunted Josephson junctions

This article presents the synchronisation criteria for a class of dynamical networks with each node being resistively-capacitively-inductively-shunted (RCL-shunted) Josephson junction, which guarantee the synchronised states to be global asymptotically stable. These conditions are established in terms of linear matrix inequalities (LMIs), readily solvable by available numerical software. In addition, an interesting conclusion is reached that the stability of synchronisation in the coupled whole 3N-dimensional networks can be converted into that of 3-dimensional space.     

基于LWAPP的WLAN工作机制分析

随着传统WLAN建网、维护问题的不断出现,一种全新的基于LWAPP (Lightweight Access Point Protocol,轻型接入点协议)的WLAN应运而生.指出了传统的WLAN存在的问题,介绍了基于LWAPP的WLAN的架构,阐述了LWAPP数据和控制信息的隧道传输模式,分析了轻型接入点和无线局域网控...     

复杂地质条件下暗挖隧道施工地下水治理技术

通过分析某暗挖隧道的工程地质及水文地质概况,经比选采取水平旋喷+深孔注浆+水平井的综合堵排治水措施,详细阐述了治水措施的技术要点,取得了良好的效果。     

Air quality work at Guelph: GAViM and a traffic tunnel study

The Guelph Aerosol and Visibility Monitoring (GAViM) program presently runs three monitoring sites: two rural sites compatible with the IMPROVE protocol and one urban site mostly for special comparison studies. Fine aerosol is analyzed by the Laser Integrated Plate Method (LIPM), Proton Elastic Scattering Analysis (PESA), Proton Induced X-ray Emission (PIXE) and gravimetric analysis. Air quality data from the presently running sites and from two rural sites operated in the past are available through the WWW. The Guelph Scanning Proton Laboratory also participates in other aerosol programs: PIXE was employed to determine the composition of the ambient aerosol in a Vancouver traffic tunnel, to identify the main emission sources and to make estimates of vehicle emission factors. The PIXE facility was also modified for analysis of size-fractionated samples from the PIXE International Cascade Impactor (PCI) sampler. Significant improvement in detection limits for light elements due to the two-detector PIXE system used in Guelph, was justified particularly because of low air particulate loadings in case of PCI.     

柔性金属掩护支架的巷道布置与参数分析

针对某些急倾斜松软破碎结构煤层在采用柔性金属掩护支架回采过程中存在的具体问题 ,指出必须改变巷道布置和回采工艺 ,才能达到安全生产和提高工效之目的     

河源洞浅埋偏压小净距隧道进洞施工技术

通过河源洞隧道实例,对小净距浅埋偏压隧道洞外加固措施、进洞顺序选择、施工工序安排、监控量测等关键的技术措施进行了探讨和总结,从而为类似隧道的施工积累经验。     

新琼隧道二次衬砌裂缝处治分析

泉三高速公路新琼隧道,左洞二衬混凝土出现裂缝,为确保行车安全,采取返工、加固进行处理。针对隧道二衬裂缝、处治等情况,作了一些分析,仅供连拱隧道的施工及病害处理等作为参考。