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软土地基中,填土造成土层固结沉降,对建筑物产生很多不利影响。该文通过武汉市滨江大道整体抬高的建设方案,对堤防影响进行了分析,阐述了填土造成的土层固结沉降影响形成的原因及处理方法。 相似文献
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长江中下游航道治理中以软体排为主的护滩工程易造成滩面硬质化。为改善护滩工程区滩面生态环境,基于亲水植被的固土效应,结合新洲—九江河段航道整治二期工程,提出一种兼顾疏浚弃土利用与洲滩守护的生态航道建设技术。该技术利用疏浚弃土适当抬高洲滩滩面,并引入本土耐淹亲水植被,采用可降解、无污染的天然材料进行辅助固土防冲,确保先锋植被能够稳定发育至足够丰度,进而实现滩体稳定。 相似文献
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基于数据预处理的铁路客运量灰色预测模型 总被引:3,自引:0,他引:3
铁路是国家的基础设施,对铁路的客运量进行准确地预测具有重要的理论意义和实际应用价值。首先对传统预测方法进行了分析,指出它们在运量预测中的不足,进而提出应用灰预测进行运量预测的优势。结合滑动平均法对灰预测方法进行了改进,同时考虑初始条件的改变。在预测2006-2010年全社会客运总量的基础上,根据铁路客运在各种运输方式中所占的份额预测2006-2010年的铁路客运总量。 相似文献
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结合吴淞江特大桥连续箱梁悬臂浇注施工案例,有关挂篮设计原则和具体施工方案表明,挂篮设计是无定性的,只有结合桥梁结构自身的特点和施工能力,才能取得较好的效果. 相似文献
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This paper aims to evaluate the likely effects of the adoption of Longer Heavier Vehicles (LHVs) from the perspective of logistics service providers (LSPs). The research consists of six case studies and a survey of companies which were involved LHV trials in Germany. Wider introduction of LHVs is being increasingly demanded so that road freight transport can better serve and support modern supply chains whilst achieving the desired eco-efficiency advancements. Available literature on LHVs puts a particular emphasis on five factors that need to be included in the assessment of their impact: energy efficiency, CO2 emissions, costs, safety and infrastructure. The research provides an original and innovative empirical study refining and validating the current conceptual framework for assessing LHVs demonstrating it is a valuable tool and providing evidence that the vast majority of companies participating in our study, regardless of their size, were interested in the adoption of LHVs. However, it should be noted that a key limitation of the research is that by focusing on a single country case, the nature and scale of the findings may not reflect practice in other countries and sectors. There is also a need to examine the long-term sustainability of the improvements made. 相似文献
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The proliferation of hub-and-spoke operations in maritime container transportation has resulted in the widespread consolidation of traffic flows. Utilising liner shipping network configurations, this paper assesses the impact of freight traffic consolidation in the container port industry by exploring the spatial pattern of traffic flow movements and identifying the variety of roles that container ports play within this context. On the basis of the network concept, the spatial inequality of freight traffic consolidation is determined by the density and direction of all meaningful connections (i.e. significant flows) identified by applying Multiple Linkage Analysis (MLA) to an initial traffic flow matrix.The effectiveness of the chosen methodology is tested empirically using a sample comprising the 18 major container ports in East Asia, together with another 21 important container ports located on the East–West trading route. Based on this sample network, the spatial structure of traffic flow consolidation reveals the nature and structure of hub-and-spoke operations within a port system, the relative hub-dependence of ports, the variety of roles which individual ports play within the overall structure of inter-port interactions and the hierarchical configuration of the port industry structure. The paper concludes that MLA offers new insights into the distributional inequality of traffic flows, the spatial and economic interactions between ports and the extent to which hinterlands overlap. Furthermore, the analysis clearly shows that inter-port relationships can no longer be evaluated as isolated phenomena; any change in a specific port’s competitiveness will directly impact upon the structure of the whole maritime transportation system. Port authorities and terminal operators will need, therefore, to carefully analyse and disentangle specific inter-port relationships in order to provide the most appropriate basis for their decision making. 相似文献