共查询到20条相似文献,搜索用时 62 毫秒
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多年冻土地区路基修筑技术及实践 总被引:2,自引:0,他引:2
我国多年冻土地区的路基修筑技术及其相关研究走过了50年的历程。从多年冻土地区路基修筑技术的回顾出发,系统总结了多年冻土地区路基冻胀、融沉和纵向裂缝等主导病害的发育性状、分布规律和形成机理,就基于多年冻土稳定的路基设计理论和面向调控的路基稳定结构进行了深入探讨,最后提出了路基修筑技术未来的发展趋势。 相似文献
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青藏铁路昆仑山隧道渗漏水原因探讨 总被引:4,自引:1,他引:3
通过现场调查和监测,分析探讨了昆仑山隧道渗漏水排水不畅的原因、水的来源、 方向及保温方法,提出了多年冻土地区隧道修建时需要补充考虑的因素和采取的措施,为高原高 寒多年冻土地区修建隧道提供新技术和经验。 相似文献
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洛阳铁路枢纽调整规划研究 总被引:1,自引:0,他引:1
通过研究洛阳铁路枢纽存在的问题、能力利用现状以及枢纽的运输需求,得出洛阳枢纽能力紧张、不能满足日益增长的客货运量运输需求的结论。结合枢纽自身特点,提出成环发展的规划方案,通过对运输能力计算表明,所提出的规划方案能缓解当前运输能力紧张的局面。 相似文献
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对吉林省靖宇县修建地方铁路的货运量及项目建设的必要性进行了分析,并就靖宇县所处的位置,提出了两个比较方案,方案中突出了环境保护和水土保持条件,建议采用辉南站接轨方案。 相似文献
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粤海通道铁路栈桥是我国第一座海上铁路栈桥,其结构技术与普通桥梁有很大差异。简要介绍粤海铁路栈桥的结构技术特点。 相似文献
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Railway Vehicle Active Suspensions 总被引:3,自引:0,他引:3
J. K. Hedrick Associate Professor 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1981,10(4):267-283
This paper reviews the state-of-the-art of active suspensions for use on railway vehicles. The primary focus of the paper is on ride quality control, both vertical and lateral, and on lateral stability control.
The section on theoretical considerations summarizes the results of a one-degree of freedom optimization and then investigates analytically the use of active suspensions for lateral ride and stability augmentation. It is shown that separate control structures using different measurements and actuator actions are very effective in controlling both ride quality and stability.
A section on a survey ofcurrent activities reviews published research on active railway suspension work around the world.
Finally a concluding section indicates future trends in active suspension applications. 相似文献
The section on theoretical considerations summarizes the results of a one-degree of freedom optimization and then investigates analytically the use of active suspensions for lateral ride and stability augmentation. It is shown that separate control structures using different measurements and actuator actions are very effective in controlling both ride quality and stability.
A section on a survey ofcurrent activities reviews published research on active railway suspension work around the world.
Finally a concluding section indicates future trends in active suspension applications. 相似文献
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山西中南部重载铁路与京沪高铁在山东泰安交叉,由于重载铁路设计轴重达30 t,动应力影响深度大,采用何种路基结构型式,避免外荷对高铁桥墩的影响,成为控制线路安全通过高铁的关键。同时,该处线路北临大汶河,采用何种防水路基结构,以满足大汶河百年洪水位防洪要求,也是设计需考虑的重要因素。研究结果表明:采用路堤式U型槽路基结构型式,取得了预期效果。 相似文献
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Stabilization of High-Speed Railway Vehicles 总被引:4,自引:0,他引:4
Y.V. Diomin 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1994,23(1):107-114
The problems of critical speeds of railway vehicles with dry friction units determination are discussed. A new approach is used which extends the field of application of dynamic response linear analysis methods to vital nonlinear multibody systems. The special features concerning the influence of dry friction forces in the body supports on the trucks and parameters of horizontal constraints of wheelsets and truck frames on critical speed are indicated. It is shown that a significant rising of railway vehicle critical speeds can be reached by changing the structure of constraints between the body and the trucks. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):255-269
SUMMARY In the present paper the theories of the railway wheel and the automotive tyre are discussed. After an introduction the paper opens with a discussion of the common ground, viz. the rolling motion of deformable bodies. Then the railway wheel is discussed, and it is shown that all aspects may be calculated numerically from the material constants Poisson's ratio, Young's modulus, and the coefficient of friction, and from the geometry of wheel and rail. Next the automotive wheel is considered. Such a wheel is very anisotropic, to the extent that the theory of the lateral motion (out-of-plane dynamics) is radically different from the longitudinal, or in-plane motion. Moreover, the analysis of the automotive wheel heavily relies on experiments. In the conclusion, the theories are compared. 相似文献