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近年来,国家非常重视农村基础设施建设,从中央到地方各级党委、政府出台了一系列优惠政策,各地呈现出农村公路建设热的良好势头,但是,随着农村公路建设如火如荼开展,还应该注意到一个很容易被忽视但却尤为重要的问题那就是农村公路建设中的环保问题。文章阐明了农村公路建设环保工作的重要性。并对其存在的问题进行了分析,提出了解决方法和措施 相似文献
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结合贵州省普通国省干线及农村公路承灾体风险普查工作,对其风险点发育分布特征进行深入分析,以完善公路承灾体风险点和基础设施属性数据库,查明全省国省干线及农村公路风险点数量、类型、风险等级及发育分布特征,为公路地质灾害风险管控及后续自然灾害综合风险评估与区划提供详实的基础资料。 相似文献
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农村公路勘测设计是农村公路建设的灵魂与基础,提高设计工作的创新意识,选择节约型优良设计方案,是降低农村公路建设成本的有效途径. 相似文献
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文章结合凤山县农村公路建设实际,分析了山区农村公路建设规划、勘察、设计、施工管理及投资方面存在的问题,提出了相应的改进意见和建议。 相似文献
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文章基于河池农村公路建设现状,总结了河池农村公路建设的有效经验,阐述了河池农村公路建设模式的优点、作用,为今后的农村公路建设与管理提供借鉴。 相似文献
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绿色公路技术创新是当前农村公路建设中的一个重要课题。随着环境保护和可持续发展意识的提升,探索绿色公路技术创新成为推动农村公路可持续发展的关键。通过采用可再生材料、智能交通管理系统、生态护坡和植被修复、雨水收集系统以及太阳能设施等创新技术,农村公路可以实现资源节约、环境友好和能源可持续利用。这些绿色公路技术创新不仅可以提高农村公路的效益和可持续性,还可以促进农村地区的经济发展和生态保护。因此,积极探索和应用绿色公路技术创新对于推动农村公路建设的可持续发展具有重要意义。 相似文献
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农村公路包含县道、乡道和村道,在公路网中数量最多,分布最广,是保障和改善农村民生的基础性、先导性条件,农村公路建设是交通强国建设的重要内容。本文以济宁邹城市为例,结合城市经济社会方面的发展基础分析,全面总结农村公路发展现状及现阶段的相关发展与工作经验,认真梳理目前仍存在的问题与不足,自上而下科学地研判全国、山东省、济宁市层面经济社会与农村公路的发展要求与发展形势,包括交通强国建设、乡村振兴等战略,从路网延伸通达、改造提升、养护管理,特色品牌打造等层面,分别制定全市农村公路体系的优化对策与方案。 相似文献
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本文深入分析了农村公路交通建设的现状,针对新农村公路交通现状和建设中存在的诸多问题,提出了加强新农村公路建设的建议和对策,逐步实现农村公路建设、养护和运输市场管理的制度化,保证农村公路建设的可持续发展。 相似文献
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Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD). An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip. It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links. 相似文献
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This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress. 相似文献
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本文阐述了混合动力列车的技术特点及其相应优势与劣势,同时介绍了其在国内外的研究动向,并对其应用前景进行了展望。尽管该类新型铁道车辆的续航能力、电池寿命以及成本等相关问题目前仍有待改善,但以其对城市环境的美化作用与优越的舒适驾乘性能,以及高效节能、绿色环保的显著优势,依然不失为一类充满前景的新型轨道交通运输方式。 相似文献
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In India pedestrians usually cross the road at mid-block crosswalks due to ease of access to their destination or the development of adjacent land use types such as shopping, business areas, school and residential areas. The behaviour of pedestrian will change with respect to different land use type and this change in behaviour of pedestrian further reflects change in perceived level of service (LOS). So, it is important to evaluate the quality of service of such crossing facilities with respect to different land-use type under mixed traffic conditions. In this framework, pedestrian perceived LOS were collected with respect to different land-use type such as shopping, residential and business areas. The ordered probit (OP) model was developed by using NLOGIT software package, with number of vehicles encountered, road crossing difficulty as well as safety considered as primary factors along with pedestrian individual factors (gender and age), land-use type and roadway geometry. From the model results, it has been concluded that perceived safety, crossing difficulty, land-use condition, number of vehicles encountered, median width and number of lanes have significant effect on pedestrian perceived LOS at unprotected (un-signalized) mid-block crosswalks in mixed traffic scenario. The inferences of these results highlights the importance of land use planning in designing a new set of pedestrian access facilities for unprotected mid-block crosswalks under mixed traffic conditions. Also the study results would be useful for evaluating pedestrian accessibility taking into account different land-use type and planning required degree of segregation with vehicular movement at unprotected mid-block crosswalk locations. 相似文献
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明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。 相似文献
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采用随机场模型能够有效地模拟围岩参数的空间变异性。文章将局部平均随机场理论、有限差分法和Monte-Carlo模拟结合在一起,得到了Monte-Carlo随机有限差分法,基于该方法编制了可考虑围岩空间变异性的隧道结构可靠度计算程序;并将围岩密度、弹性模量和内摩擦角等参数视为三维正态随机场,研究了围岩的竖向与水平向相关距离的变化对隧道结构可靠度的影响。计算结果表明,围岩空间变异性会显著影响隧道结构的可靠度,为了获得更为经济合理的支护方案,在支护设计时考虑围岩参数的空间变异性很有必要;围岩竖向或水平向相关距离的增大均会引起隧道结构失效概率的增加,但影响程度不同;隧道结构失效概率对围岩竖向空间变异性更加敏感,故在工程勘察费用较少时,可考虑将勘察费用更多地投入到竖向相关距离的勘测,水平向相关距离可参考已有经验数据取值。 相似文献