An air cleaner for road tunnels

1. Introduction With the development of transportation, more and more road tunnels, especially the long tunnels, such as Erlangshan Tunnel (4176 m, China), Arlberg Tunnel (13972 m, Austria), Kan-etsu Tunnel (11055 m, South tube, Japan) and Laerdal Tunnel (24510m, Norway) have been built on the highway lines [1]. In a road tunnel, the exhaust gases given off by automobile engines, such as smoke, carbon monoxide (CO), oxynitride (NOx), hydrocarbon, etc., and dust produced by the passing a…     

浅谈混凝土配合比设计应注意的问题

本文对混凝土配合比设计中值得注意的几个问题进行分析，并提出相应的防治措施。     

采用压密注浆技术处理公路软土路基沉降

对马鞍山湖西南路软土路基进行了稳定性分析及沉降计算 ,对不满足规范要求的路基 ,最后采用压密注浆技术进行工程处理。     

浅谈混凝土配合比设计应注意的问题

本文对混凝土配合比设计中值得注意的几个问题进行分析,并提出相应的防治措施。     

潘东公司B4煤层防突技术实践

为保证强突出煤层的安全施工,必须采取措施对其进行消突,潘东公司在西二采区-350~-430 m B4煤层下山的施工过程中,采取以巷帮钻场长钻孔抽放和迎头短孔排放相结合的综合防突措施,并运用防突预测图提前对巷道前方存在的可能引起突出的相关要素进行预测,提前采取强化消突措施,同时辅以规范、严格的现场管理,实现了强突煤层的安全施工;实践证明瓦斯抽放和钻孔排放是防治煤与瓦斯突出行之有效的措施。     

水泥混凝土路面修复与加铺的质量控制

以厦门市仙岳路西段高架桥地面旧水泥混凝土路面改造工程为例,阐述了旧水泥混凝土路面的病害类型和处治方法、玻璃纤维格栅的应用、沥青混凝土加铺层类型的选用及SMA混合料配合比设计和施工.工程实践证明,上述各施工工艺和质量控制,能有效地减少反射裂缝产生,提高旧水泥混凝土路面沥青加铺层的路用性能.     

越江公路隧道浅埋段地温长期演化的数值预测(英文)

在考虑并行隧道耦合传热的前提下,预测越江公路隧道江岸浅埋段地温的长期演化,使用有限差分法进行数值模拟,通过现场观测与数值迭代方式确定边界条件与初值.模拟结果表明:最终的计算稳定传热时间为68年,但传热在20年内即基本完成;隧道周围的初始恒温土层最终被转变为年变温土层;隧道外侧5 m及两孔之间出现了一个显著变温区,其最大温升值为7.14℃,最大年度温升的峰谷值为10℃;隧道周围10 m以下土层的温度变化仅由隧道传热所控制;两孔之间土层的最终稳定温度要高于其他位置的最终稳定温度,证实了耦合传热效应的存在.此外,还提出了一组单变量函数的回归模型,用以估计隧道周围不同位置土层的年度温度波动量.该研究将有助于深入探究隧道浅埋段所穿越江滩区域工程地质条件的长期演化趋势.     

浅谈永定县城市道路绿化和行道树种的选择

永定县城行道树存在着树种较为单一,部分树种表现欠佳问题。通过借鉴国内外行道树种选择的成功经验,结合当地的实际情况,阐述了本地树种作为行道树的独特作用,并对可推广的本地树种作了介绍。     

Role of wind tunnels in aircraft design

Aircraft of various types are necessary for meeting the defence and air transport requirements of any country. Till recently a large fraction of the Indian aircraft requirements have been met by imports or licensed production. However there is a trend towards design and manufacture of aircraft within the country. Among the recent design projects are the Light Combat Aircraft (LCA), Light Transport Aircraft (LTA), Advanced Light Helicopter(ALH), Hindustan Jet Trainer (HJT-16), Light Trainer (HANSA) and the unmanned air vehicles — Lakshya and Nishant.     

中国特色城镇化道路的理论问题探讨

走中国特色的城镇化道路,既要求加快人口城镇化和区域城镇化的步伐,又要求在经济意义上实现农村地域的城镇化。中国在计划经济体制下的城市化道路应该抛弃,而世界上发达国家的城镇化道路可资借鉴但不能照搬套用。因此,必须坚持大中小城市和小城镇协调发展,走中国特色的城镇化道路。     

The strategy to align road safety education to the Further Education and Training band curriculum

Road safety education is a complex phenomenon which should be viewed holistically if taken into account the interconnectedness of education, infrastructure and enforcement. Effective road safety education is specifically important for learners in the Further Education and Training (FET) band, as they are active contributors to a community. The greatest criticism against road safety education is that it is aimed at changing learners’ knowledge about the subject, but not necessarily influencing their attitudes as road users. The aim of this discussion article is to explore a strategy to integrate road safety education into the formal curriculum of specifically schools responsible for the FET band. By applying the desktop research method, the article conceptualises what the specific purpose of the FET band is and what the possible focus of road safety education and training should be. The article then explores international common practices in road safety education and training, and considers the necessary synergy between education, engineering and enforcement. The article uses secondary data collected from documents which are then thematically analysed. A coordinated and comprehensive education and training strategy is needed, facilitating partnerships in various sectors to implement such education in the FET band, in multidisciplinary ways, in a contextualised curriculum.     

长大山区高速公路隧道防排水设计与施工

结合某山区高速公路隧道防排水设计与施工实例,介绍了山区高速公路隧道防排水工程的设计要点及在实际施工过程中的一些具体做法。     

Ground-borne vibrations due to dynamic loadings from moving trains in subway tunnels

In this study, ground vibrations due to dynamic loadings from trains moving in subway tunnels were investigated using a 2.5D finite element model of an underground tunnel and surrounding soil interactions. In our model, wave propagation in the infinitely extended ground is dealt with using a simple, yet efficient gradually damped artificial boundary. Based on the assumption of invariant geometry and material distribution in the tunnel??s direction, the Fourier transform of the spatial dimension in this direction is applied to represent the waves in terms of the wave-number. Finite element discretization is employed in the cross-section perpendicular to the tunnel direction and the governing equations are solved for every discrete wave-number. The 3D ground responses are calculated from the wave-number expansion by employing the inverse Fourier transform. The accuracy of the proposed analysis method is verified by a semi-analytical solution of a rectangular load moving inside a soil stratum. A case study of subway train induced ground vibration is presented and the dependency of wave attenuation at the ground surface on the vibration frequency of the moving load is discussed.     

商品混凝土原材料质量管理

本文强调了商品砼的质量控制必须从原材料入手，应加强管理。     

冲击载荷作用下混凝土本构模型(英文)

为了更好地设计和分析混凝土结构,对冲击荷载作用下混凝土材料的力学特性进行了研究.将混凝土材料看成实体和微裂纹组成的复合材料,其中实体由粗骨料和水泥砂浆基体组成.假设水泥砂浆基体为弹性的、均匀的和各向同性的.基于Mori-Tanaka理论和Eshelby等效夹杂理论建立了冲击荷载作用下混凝土材料的动态本构模型.同时,进行了混凝土和水泥砂浆的冲击压缩试验.实验表明:混凝土和水泥砂浆都是率相关材料.在相同的冲击速度下,混凝土比水泥砂浆具有更高的承载能力,但混凝土的最大应变低于水泥砂浆材料.不论混凝土材料还是水泥砂浆材料,随着冲击速度的提高,破坏实验后试件的尺寸都逐渐减小.     

长大山区高速公路隧道防排水设计与施工

结合某山区高速公路隧道防排水设计与施工实例,介绍了山区高速公路隧道防排水工程的设计要点及在实际施工过程中的一些具体做法。     

论沥青路面裂缝的形成和防治

沥青路面裂缝问题是公路工程质量的通病之一．本文对沥青路面裂缝的种类及原因进行了较详细的分析，并有针对性地提出了预防沥青路面裂缝的措施-     

论邓小平具体问题具体分析的思想

具体问题具体分析是邓小平分析处理问题的基本思想和方法，是邓小平方法论的灵魂，邓小平的这一思想主要体现在以下四个方面，在把马列主义普遍原理与中国实际相结合的过程中，必须对客观实际进行具体分析；对马列主义、毛泽东思想中的具体观点，要放在当时的历史条件下去理解；评价历史必须具体问题具体分析；处理现实问题必须具体情况具体分析。这四个方面从理论层面到实践层面构成了一个完整的有机体。始终坚持和成功运用具体问题具体分析的方法，是邓小平能够创造性地发展马列主义、毛泽东思想，创立邓小平理论的重要主观条件之一。     

列宁探索社会主义道路的历史轨迹及当代意义

列宁十月革命后对俄国特色社会主义道路的探索,是马克思主义同俄国革命和建设相结合的产物,凝聚着列宁对社会主义道路理论和实践上的艰辛探索和呕心沥血,是人类宝贵的财富.列宁探索社会主义发展道路经历了由直接过渡到迂回过渡的转变,其间提出的许多新思想,新理论,对我们推进改革开放进程,加速社会主义现代化建设,具有重要的借鉴意义.     

矿井瓦斯涌出特征及技术措施

本文浅析矿井瓦斯普通涌出的三种特征和一般规律性，并针对性的提出了一些安全技术措施。