吴家湾特大桥连续梁0#块施工技术

铜九铁路吴家湾特大桥连续梁0#块施工过程中,根据现场实际,利用承台首先支立钢管混凝土临时支墩,再通过墩身预埋件安装支架体系其它构件,并在钢管混凝土临时支墩顶部预埋螺纹钢伸入梁体,实现梁体与临时墩的临时固结,完后进行混凝土浇筑。施工实践表明,采用此方法施工0#块,节省时间与资金,支架受力明确并安全与稳定,且减少了对既有高速公路运营影响。对类似工程有借鉴意义。     

深圳地铁调车振动原因分析及对策

分析了深圳地铁GK_(0C) 102号调车机车出现振动异常的机理,提出了相应的改进建议,最终使该机车消除了异常振动。     

桩基施工在特殊地质情况下的处理方案

在桥梁桩基施工中,会遇到多层孤石或溶洞等复杂的地质情况,给施工带来难度,该文针对上述两种地质情况,详细介绍了有效的处理方法。     

基于0-1整数线性规划的军事空运装载优化算法

为了高效地制定军事空运装载方案,在分析空运物资和载机货舱特点的基础上,构建了6种待装物资类型模式和6种承载空间物资布局模式,将三维空运装载问题转化为二维装载问题,建立了军事空运装载问题的数学模型.通过构建空间布局转化模式,将空间布局约束转换成0-1整数线性约束,实现了对0-1整数线性规划空运装载问题的求解.仿真结果表明:该算法运算时间不超过1 s,装载方案平均载重率达38.8%,平均有效空间利用率达59.7%.     

Parameterisation of clastic sediments including benthic structures

The sediment transport processes in the south-western Baltic Sea are predicted by means of a numerical model in the project DYNAS. There are two sediment parameters that influence the results of modelling remarkably: critical shear stress velocity and bottom roughness. This paper presents the way how to parameterise these factors and extrapolate them into the investigation area. The critical shear stress velocity is parameterised basing on grain size data, combining approximations after Hjulström [Hjulström, F., 1935: Studies in the morphological activity of rivers as illustrated by the river Fyris. Geological Institution of University of Uppsala: Bulletin (25): 221–528.], Shields [Shields, A., 1936: Anwendung der Ähnlichkeits-Mechanik und der Turbulenzforschung auf die Geschiebebewegung. Mitteilungen der Preussischen Versuchsanstalt für Wasserbau und Schiffahrt (26): 26 pp.] and Bohling [Bohling, B., 2003: Untersuchungen zur Mobilität natürlicher und anthropogener Sedimente in der Mecklenburger Bucht. unpublished doctoral thesis, Mathematisch-Naturwissenschaftliche Fakultät, Ernst-Moritz-Arndt-Universität Greifswald/Germany, 156 pp.]. The roughness length, in the case of absence of macro zoo-benthos and their structures, is parameterised basing on grain size too employing Soulsby [Soulsby, R.L., 1997: Dynamics of Marine Sands: a Manual for Practical Applications. London, Thomas Telford Publications. 249 pp.], Nielsen [Nielsen, P., 1983: Analytical determination of nearshore wave height variation due to refraction shoaling and friction. Coastal Engineering 7, 233–251.] and Yalin [Yalin, M.S., 1977: Mechanics of Sediment Transport. Pergamon Press, New York. 298 pp.]. No equivalent simple parameterisations for biologically caused bed roughness exist. Here, findings of Friedrichs [Friedrichs, M., 2004: Flow-induced effects of macro zoo-benthic structures on the near-bed sediment transport. Dissertation, Universität Rostock, 80 S.] and estimations by the DYNAS biologists group were combined in order to derive roughness lengths from abundance measurements of four previously selected key species which represent the originators of the dominating benthic structures at the sea floor in the south-western Baltic Sea. Critical shear stress velocity and bed roughness are known at few sample sites only. They were extrapolated into the larger investigation area using a proxy-target concept. The mean near bottom milieu (bathymetry, median grain size, salinity, oxygen) which was derived using results from numerical modelling serves as the proxy. Since the milieu parameters are measured at the sampling sites for which the target parameters have been determined, a combined hierarchical and supervised classification was employed to transfer the local knowledge into the unknown investigation area.     

连续梁桥0^#块施工支架方案优化设计

文章针对南充嘉陵江特大桥连续梁0#块支架前期设计方案存在的问题,提出了连续梁0#块施工支架优化方案,并通过技术性与经济性对比分析,验证了优化设计方案的合理性。     

深圳湾大桥海上悬臂拼装连续梁施工技术

结合连接深圳香港的深圳湾大桥非通航孔海上悬臂拼装连续箱梁工程实践,介绍节段预制、运输,墩旁支架、边跨支架设置,预制0#块吊装、对位等采取的施工技术,以期为类似工程施工提供有益借鉴。     

我国城市轨道交通故障车停车线布局设置的模型与算法

故障车停车线的布局设置对城市轨道交通线路工程的造价和建成后的运营均有重要影响. 本文从建设和运营两方面对城市轨道交通故障车停车线的布局设置方案的优化进行了研究,介绍了城市轨道交通中故障车停车线设置研究的现状,从城市轨道交通系统运营角度分析了故障车处理及救援的基本流程;参考地铁设计规范及运营要求,建立了以考虑故障救援效果和工程造价二者为优化目标的故障线布局设置多目标0-1规划模型;并结合模型实际背景设计了隐枚举求解方法;运用某条城市轨道交通线路的设计数据对模型和求解算法进行了验证. 结果表明,该方法能够快速、合理地得出故障车停车线的布局设置方案.     

A Novel Model of F0 Contours Prediction for Continuous Speech

F0 （fundamental frequency） contour was studied under different prosodic environment in continuous speech and a novel model of F0 contours prediction was proposed. It describes syllabic F0 contour with two points, one curve and duration. The curve represents two optimal points of controlling parameters. The duration represents the syllabic duration. The prosodic characters of controlling parameters were analyzed by CART （Class and Regression Tree）. A set of controlling parameters was analyzed, which reflects the linguistic environment and prosodic structure. Then it sets up the model of F0 contours prediction with the two optimal controlling parameters and F0 templates. The end pitch value of previous syllable as special prosodic parameters was used to keep the continuity of fore-and-aft syllable. It focuses on looking out the main prosodic clues hiding in F0 contours and applying it to simplify the model for prediction. The results of synthesis experiment show that the performance of the prediction method is appreciated.