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51.
为解决复杂环境下基坑开挖时下方地铁隧道正常运营的难题,依托郑州某市政管廊上跨地铁区间隧道项目,采用三维数值模拟计算及施工监测数据分析的方法。得出如下结论: 1)通过选取合理的基坑围护方案,可减小基坑围护结构施工对地铁区间隧道的扰动影响; 2)对于工程地质情况较好的地区通过细化上跨基坑开挖方式,采用基底加固+抽条施工的方案可保证地铁区间隧道的正常运营。 相似文献
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山区高等级公路选线的几点认识 总被引:1,自引:0,他引:1
根据山岭区的特点提出了对山岭区高等级公路选线的几点认识,总结了在山区高等级公路选线过程中应注重的几个问题。 相似文献
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山西平遥至榆社高速公路穿越自然保护区路段的生态环境影响评价 总被引:2,自引:2,他引:2
结合山西平遥至榆社高速公路的环境影响评价工作,通过对拟穿越超山自然保护区路段生态环境现状的调查,论述了公路建设可能对生态环境造成的影响,并提出了相应的措施和建议。 相似文献
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Kelly J. Clifton Carolina V. Burnier Gulsah Akar 《Transportation Research Part D: Transport and Environment》2009,14(6):425-436
This paper examines the impact of personal and environmental characteristics on severity of injuries sustained in pedestrian–vehicle crashes using a generalized ordered probit model. The data covers 2000–2004 of pedestrian–vehicle crashes taken from police incident reports for Baltimore City and supplemented with local land use, urban form and transportation information specific to the individual crash locations. The results on personal and behavioral variables confirm previous findings. Women pedestrians involved in crashes tend to be injured less frequently than their male counterparts; children have an increased likelihood of sustaining injuries and older persons are more likely to be fatally injured. Pedestrians who cross against the traffic signal, are not in a crosswalk and are involved in a crash after dark are associated with greater injury risk. Of the built environment policy variables of interest, transit access and greater pedestrian connectivity, such as central city areas, are significant and negatively associated with injury severity. These results suggest that the environmental conditions should be given more scrutiny and be an important consideration when evaluating and planning for pedestrian safety. 相似文献
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Zhibin Li Wei WangPan Liu David R. Ragland 《Transportation Research Part D: Transport and Environment》2012,17(3):256-261
This study investigates the impacts of physical environments on bicyclists’ perceptions of comfort on separated and on-street bicycle facilities. Based on a field investigation conducted in Nanjing, China, we find that physical environmental factors significantly influencing bicyclists’ perception of comfort on the two types of facility. Cyclists’ comfort is mainly influenced by the road geometry and surrounding conditions on physically separated paths while they pay attention to the effective riding space and traffic situations on on-street bicycle lanes. 相似文献
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Municipalities play an important role in the planning and development of communities that support active transportation (AT), which refers to human-powered modes of travel, such as walking and cycling. Municipal-level stakeholders involved in land-use and transportation infrastructure planning consider multiple social, environmental and economic considerations to inform decision-making and investments in AT. Evidence around the fiscal benefits of AT investment for local governments has not been systematically identified. This scoping review sought to explore the existing evidence regarding investments in AT and opportunities for savings on municipal expenditures and revenue generation. In total, 7060 records were located and screened; of which 162 full-text articles were reviewed. Ultimately, 23 articles met our inclusion criteria and were included in this review. The available evidence focuses on potential economic benefits of AT in the areas of tax revenues, property values, consumer spending and employment, all of which are relevant sources of revenue generation in municipal operating budgets. An evidence gap was identified regarding AT infrastructure investments and benefits corresponding to municipal expenditures (e.g. maintenance cost savings). Notably, a large portion of literature was published after 2009, suggesting that municipal-level evidence on the fiscal benefits of AT investments may just be emerging. 相似文献
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Historic vehicles (HVs) are the heritage of road transport that have surprisingly received little attention in the academic literature. This study presents an overview of the literature on HVs, focusing on the three topics that dominate the policy debate on transport: environmental, safety and congestion impacts. We observed that polluting emissions of HVs are per kilometre much higher (often a factor 5 or more) than those of moderns vehicles. The annual average mileage per vehicle per year of HVs is much lower than other vehicles. The lower active and passive safety levels of HVs are compensated by the way these vehicles are driven, resulting in the risk factors per kilometre being roughly equal or lower than other vehicles. The contribution of HVs to congestion is negligible. However, the transport policy discourse is divided on the topic of HVs. More comprehensive and effective laws and regulation are needed to protect this aspect of the heritage of road transport whilst concurrently avoiding or limiting the problems caused by them. 相似文献
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