临港新片区中运量 T2 线工程总体设计

作为国内首条应用氢能源动力的中运量公共交通线路,需要从客流、道路、运营、线网和车辆五方面综合考量确保其成功实施。首先,通过对公交客流的梳理,确定临港中运量的线路走向及车站布置。其次,经过对现状道路条件的分析,提出车道断面布置方案和交叉口节点优化方案;根据建设进度及运营要求,提出切实可行的运营组织方案。再次,对常规公交线网进行优化,进一步提升专用道的使用效率。最后,使用新型数字轨道胶轮电车,构建了临港多模式公共交通准点出行网络。     

An experimental study of wave-in-deck loading and its dependence on the properties of the topside structure

This paper concerns the largest and arguably the most threatening wave loading component experienced by a broad range of offshore structures. It arises when an incident wave crest exceeds the elevation of the underside of the deck structure, leading to direct wave-in-deck (WID) loading. The extent of this loading may be limited to the partial submergence of some of the lowermost deck beams, or could involve the large-scale inundation of the entire deck area. Either way, very large loads can arise which must be taken into account when assessing the reliability of the structure. In an earlier contribution Ma and Swan (2020) provided an extensive laboratory study exploring the variation of these loads with the properties of the incident wave. The present paper describes a second stage of this experimental study in which the variation of the WID loads with the properties of the topside structure is addressed. Specifically, it considers the porosity, position and orientation of the topside relative to the incident wave conditions, and seeks to explore both the variations in the maximum load and the loading time–history resulting from these changes.Given the highly transitory nature of a WID loading event, coupled with the fact that the problem is governed by flow conditions at, or very close to, the instantaneous water surface, the loading process is driven by an exchange of momentum from the wave crest to the topside structure. A recently developed WID load model, based on exactly these arguments (Ma and Swan 2020), is used alongside the laboratory data to provide a break-down of the load into its component parts. This provides an enhanced physical understanding of the resulting load time–history. The first part of the study is based upon an idealised generic topside structure, allowing a systematic variation in key parameters, particularly porosity. The second part addresses a realistic topside structure demonstrating the practical relevance of earlier work. Taken together, the analysis clearly establishes the importance of the topside porosity, clarifies the spatial effects associated with the evolution of a large ocean wave beneath the plan area of a structure and explains the unexpected occurrence of impact-type loading on topside structures having a high porosity. Most importantly, the paper highlights those properties of a topside structure which must be incorporated if the WID loads are to be accurately predicted.     

淮安水利枢纽通航渡槽船舶航行三维数模分析

淮安水利枢纽二期工程需要增建渡槽,与一期渡槽形成长距离通航渡槽后可能对通航条件造成影响.针对这一问题,建立了三维数学模型,选择最不利船型组合情况下的两种工况,模拟分析二期渡槽建设前后的渡槽通航条件,即上下行船舶对开工况、是否布置消能格栅工况.得出结论:1)在不布置消能格栅的情况下二期渡槽建成后波高增加约20％,在增加消...     

长江口横沙东滩滩涂整治利用和展望

分析长江口、横沙东滩历史和近期演变以及利用情况。近期长江口河势总体稳定,在采取人工促淤等措施下,滩涂资源动态平衡。分析横沙东滩滩涂整治利用工程建设前后的滩涂变化,工程周边滩涂淤涨,有助于改善局部区域的自然环境。近期横沙浅滩-5 m滩涂资源有减少趋势,建议结合疏浚土利用以及保持滩涂湿地动态平衡的需求及早整治,有控制性地、分期适当圈围。     

区域性交通影响评价阈值的确定方法

新改扩建项目交通影响评价协调了交通需求与交通供给之间的关系,但单体建设项目的交通影响评价方法对于协调城市中某一区域的交通往往带来诸多利益主体平衡的困难,导致交通影响评价的效果不理想.为此,在城市快速发展时期,需要建立侧重于较大范围的区域性交通影响评价方法.针对区域性交通影响评价中范围阈值的确定,提出了标准区域类比法,研究了标准区域的确定方法和阈值确定的过程,并结合北京某区域实际,进行了区域确定方法的案例研究.     

东湖绿道工程设计特点综述

东湖绿道是目前国内最长的5A级城市核心区环湖绿道,它的建成产生了良好的社会效益,被联合国人居署评为"改善中国城市公共空间示范项目",成为武汉打造宜居城市的闪亮名片。结合东湖绿道设计过程中遇到的重点和难点,详述问题的解决过程,总结绿道工程的设计特点和设计理念,为城市绿道设计提供一些方法和经验。     

盾构空推拼管片过矿山法隧道渗漏水控制

文章通过深圳地铁2号线2222标侨-香区间盾构空推拼管片过矿山法隧道段的施工,从空推拼管片渗漏水机理分析入手,分析其渗漏水的控制难点,有针对性地提出了解决办法。在施工实践中,本标段的渗漏水点、堵漏次数均得到有效地控制,收到了良好的效果。     

地铁车站主体结构渗漏水控制

在深圳地铁2号线侨香站施工中,采取基坑结构渗漏水处理、全包柔性防水层防水、混凝土主体结构施工控制、施工缝和变形缝渗漏水处理等相应措施对地铁车站结构渗漏水进行了控制和防护,取得了良好的防水效果。     

基于时间指标的P＆R换乘需求预测研究

城市外围停车换乘需求预测是停车换乘系统规划设计的重要组成部分,也是规划设计的基础和依据。以距离为指标划定P＆R设施吸引范围在山区城市有一定的局限性,文章基于山区地形、居民分布、路网等因素考虑,提出了基于时间指标划分吸引范围的方法,并且通过依据交通方式选择影响因素的相关研究,建立了换乘轻轨、公共汽车、继续使用小汽车的多项logit选择模型。     

西部山区高速公路景观规划方法探讨

文章在分析西部山区高速公路景观建设现状的基础上,对景观规划的基本原则和主要内容进行了阐述,提出将西部高速公路景观划分为城市风光、地域文化风光、田园风光及自然生态风光等四个区段,并结合实例对各区段景观规划特点进行了探讨。