广西地区高速公路沥青路面病害及防治措施

以广西南宁至友谊关、百色至罗村口高速公路为例,调查并分析了广西地区高速公路沥青路面常见病害。介绍了南友高速、百罗高速公路沥青路面目前的养护方法及技术,并对进一步完善广西地区高速公路沥青路面预防性养护工作提出了建议。     

JWLZ动车组轮重检测装置在动车检修基地的应用

针对动车组同轴左右车轮载荷需平衡在一定阈值之内这种需求,本文提出一种简捷有效的机车车辆轮重检测方法,并逐步对其应用背景、结构组成、使用方法和关键技术进行一一阐述,同时介绍了其目前的应用情况及效果,并对其进行功能扩展和应用展望.     

挖方路段路基水分迁移特性测试与分析

针对公路因开挖而出现的路基水分失衡现象,在张家口—涿州高速公路工程选取试验段埋设温度和电阻传感器,测试不同挖方深度路段(深挖、浅挖和填挖过渡段)路基在开挖渗沟前后不同深度处的电阻率;通过室内试验建立电阻率和含水率之间的关系,分析了挖方路段路基水分迁移特性.分析表明:随着挖方深度的增加,深秋与初春的含水率差值△W不断增大,即在挖方边坡水分补给和温度共同作用下,水分迁移的强度随着挖方深度的增加越来越强烈;渗沟和一定深度的换填有助于抑制挖方路段水分迁移作用,改善路基工作状态;对比填挖过渡段和深挖方路段季节性水分迁移,夏季降水对2处路段影响显著,所测土基含水率较之其他季节明显增大,季节性因素对深挖方路段水分迁移强于填挖过渡段.     

斜拉桥拉索弯曲应力及其控制对策探讨

根据斜拉索的受力特点,导出斜拉索轴向力变化时其端部弯曲应力的计算公式,通过实例分析证明,斜拉索弯曲应力不容忽视,并对国内外常用的几种斜拉索弯曲应力控制措施进行介绍。     

深圳海园一路隧道设计技术分析

随着我国城市经济的快速增长及人口的高度集中,城市隧道及地下工程的修建日益增多。鉴于城市隧道不同于山区一般隧道,该文在简单介绍城市隧道研究现状后,采用特征曲线法对隧道围岩加固机理进行了分析,以期在工程实践中能够准确、有针对性地采取措施提高隧道围岩自稳能力,保证结构安全和正常使用。结合工程实例,分析了深圳海园一路隧道的设计理念及设计方法、耐久性措施,可为以后相关工程提供技术参考。     

短期作业机械设备成本控制措施探析

机械化施工是提高公路工程现场作业质量水平的方法.以实际工程为案例,分析公路短期作业的特点及影响设备成本的几个要素,探讨短期作业机械设备成本控制的措施.     

既有路堑边坡整治措施探讨

结合老山隧道工程地质资料,从岩土体特征、排防水计算、坡面防护抗冲刷能力及边坡稳定性等方面,综合分析边坡失稳的成因,并提出合理边坡整治措施.     

道路桥梁施工管理中存在的问题及优化措施

鉴于道路桥梁施工在我国基础建设中的重要性,探讨了道路桥梁施工中出现的问题、管理方面的隐患以及相关优化措施,以促进道路桥梁施工管理工作.     

Overseas trade vis-a-vis overseas shipping: Growth and performance in India (1999–2009)

Maritime trade has been and even continues to account for about a lion's share of India's total cargo volumes. Despite the growth of multimodal transport (by land, water and air), shipping still continues to be the major mode of transport in the bulk carriage of country's overseas trade. In view of this vital role of shipping, in the first four decades of independence, under the initiative of planned development and active government support, India's shipping and port sector saw dramatic growth in their performance to build adequate national fleet, in keeping up with the transport of overseas cargo. However, the onset of economic liberalization in 1991 has given rise to many new dimensions in the development of the shipping and port sector of the country with a significant redefinition of shipping and port services, in response to the new global trend patterns. For instance, it has also established the new era of containerization in the mode of cargo delivery from the dominance of the era of bulk and break-bulk trade during the decade of sixties and seventies. Moreover, as global competition increases, in response to this emerging trade patterns within this country, India's volume of traffic growth also increases manifold. So, India's shipping and port sectors need, significantly, to build up and furnish their capacity by increasing the frequency of this mode of transport i.e. the growth of the national overseas fleet to meet this surging demand. This paper, therefore, have focused on this role of shipping in such rising overseas trade, with a view to examine the shipping performance (the growth of overseas fleet) in response to the growing overseas trade at all ports of India during the period (1999–2000 to 2008–2009), in terms of both a mathematical model and a graphical representation. Finally, it concludes that the absolute overseas trade, being highly import dependent, have led to a more or less stagnant performance in overseas shipping, owing to the lack of the adequate growth of absolute overseas exports during this period.     

公路边坡防护与生态保护分析

良好的生态环境是人和社会可持续发展的根本要求。党和政府高度重视生态环境问题,将生态文明建设列入我国的一项基本国策。在十八大报告中,在科学发展观和构建和谐社会的思想中,均将生态文明建设放在突出位置,摆到与经济建设、政治建设、文化建设、社会建设同等重要位置。公路边坡防护与生态保护的实施,对改善公路环境、防止水土流失、保持生态平衡,保障行车安全,延长公路使用寿命具有重要作用。文章从公路边坡类型、植物护坡原理、设计原则及技术措施等方面对公路边坡的防护及生态保护方面进行了论述,并结合实践案例进行具体分析。