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高模量沥青混合料抵抗车辙能力的试验分析 总被引:1,自引:1,他引:0
为分析高模量改性沥青能否提高混合料的模量及路面的抗车辙能力,文中采用粤赣(广东-赣州)高速公路拟定的级配及工地集料进行试验段沥青混合料配合比设计;试验段铺筑完后,从试验段、对比段的代表性位置钻取芯样,利用Cooper进行混合料的间接拉伸模量测定和RLWT试验。试验结果表明,采用高模量沥青混合料铺筑的路面具有较好的抗车辙能力。 相似文献
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为了进一步提高水泥混凝土路面平整度施工技术水平,解决滑模摊铺机使用DBI技术后路面平整度指标下降的问题;结合广东梅河高速公路、粤赣高速公路工程实例,通过对影响水泥混凝土路面滑模施工平整度的原因分析,认为项目现场管理、机械配套、原材料控制、施工过程控制是影响路面平整度的关键环节。通过对关键环节的控制与实施,使路面平整度指标达到了检验评定标准。 相似文献
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2005年11月18日,院技术质量部研发中心组织我院部分路面专业技术人员前往粤赣高速公路参观路面施工技术,四个设计部和咨询公司分别派技术人员共8人参加了参观学习。粤赣高速公路有限公司舒翔总经理对我们这次参观活动给予了大力支持,并派陈育书高级工程师全程陪同并为我们作了全面介绍。 相似文献
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2006年1月18日至19日,由研发中心组织,院技术质量部、各路桥设计部、隧道设计部、交通工程部、咨询公司分别派专业技术人员共24人,进行了为期两天的考察交流活动,考察的项目是粤东北去年刚刚建成通车的粤赣高速公路和梅河高速公路。18日上午从院出发,经过3小时的路途,先行到达粤赣高速公路,在粤赣高速公路有限公司舒翔总经理的精心安排下,邱志雄总工程师和赖云峰经理不仅为我们安排了具有农家特色的客家风味午餐,而且全程陪同我们在粤赣高速的参观、交流活动并作了专门介绍。考察团一路参观了已建成通车的粤赣高速公路的路容路况,并在监控中心作了短暂停留,宾主进行了多方面的技术交流。下午参观完粤赣高速公路后,考察团沿河龙、梅河高速公路行驶, 相似文献
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结合粤赣(广东-江西)高速公路、惠河(惠州-河源)高速公路沥青路面的23个凹陷跳车部位处理工程,介绍灌浆加固在高速公路路面凹陷调平中的应用技术,即通过灌浆加固路基软弱土体,并抬升调平凹陷部位,尽可能调平路面,消除跳车,基本恢复路面平顺. 相似文献
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预应力异型曲线箱梁桥的设计与计算方法研究 总被引:2,自引:0,他引:2
对城市高架桥和立交桥中经常出现的预应力异型曲线箱梁桥的设计和计算进行了分析和研究,结合实际工程,指出了该类桥梁在设计时应着重注意的问题和采取的构造措施,提出了适合该类桥梁设计计算的方法,提出了符合梁格截面划分原则的计算公式,并结合实际利用FORTRAN语言编制了梁格截面的自动划分和截面特性计算程序,利用该程序可以直接生成符合相关计算软件命令格式的截面参数文件,省去了梁格试分和大量截面特性计算的繁琐过程,使得变宽截面的梁格法计算不再费时费力,实践证明利用该设计计算方法可以效率较高的获得满足工程精度要求的计算结果,对于此类桥梁的计算和设计具有一定的指导意义和工程实用价值。 相似文献
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针对起重皮带、传送带横向两端面磨损、破裂问题,提出一种新型皮带导向方法,该方法通过将导向轮皮带接触面设计为曲面,可自动将皮带居中导向,从而消除皮带端面与导向轮边摩擦。该方案设计巧妙,成本低,杜绝了皮带异常磨损,高效地保证了平带运行可靠性及安全性,可广泛应用于国内外各行业的起吊装置、传送装置。 相似文献
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Traffic congestion in urban network has been a serious problem for decades. In this paper, a novel dynamic multi-objective optimization method for designing predictive controls of network signals is proposed. The popular cell transmission model (CTM) is used for traffic prediction. Two network models are considered, i.e., simple network which captures basic macroscopic traffic characteristics and advanced network that further considers vehicle turning and different traveling routes between origins and destinations. A network signal predictive control algorithm is developed for online multi-objective optimization. A variety of objectives are considered such as system throughput, vehicle delay, intersection crossing volume, and spillbacks. The genetic algorithm (GA) is applied to solve the optimization problem. Three example networks with different complexities are studied. It is observed that the optimal traffic performance can be achieved by the dynamic control in different situations. The influence of the objective selection on short-term and long-term network benefits is studied. With the help of parallel computing, the proposed method can be implemented in real time and is promising to improve the performance of real traffic network. 相似文献
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山区公路沥青路面基面层滑移破坏研究 总被引:15,自引:1,他引:15
针对山区公路沥青路面常见的基面层滑移破坏,为了提出有效的防治对策,首先,进行了现场调查和非均布荷载作用下的三维有限元计算。分析认为基面层滑移破坏的主要原因是沥青面层厚度较小、超载、高温、路线频繁的变坡以及施工质量较差;从而采用不同的层间处理措施进行了层间滑移室内模拟试验,并对不同温度下的层间抗剪强度进行了比较。结果表明:SBR乳化沥青具有较好的层间粘结能力和温度稳定性。最后,确定了层间抗剪设计指标,提出了基面层间采用SBR乳化沥青处理、进行层间抗剪验算、提高施工质量以及合理设计路线等防止基面层滑移的技术措施。 相似文献
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随着柴油机强化技术的不断提升,其湿式缸套的穴蚀问题日益凸现,已严重地影响了柴油机的寿命周期费用(LCC).柴油机设计和制造上解决这个问题的技术方法很多,但只有在下一代柴油机上才能应用.文章分析了柴油机湿式缸套穴蚀的出现机理,根据柴油机不同的使用阶段,提出柴油机使用和维修方面要解决的问题,并详细介绍了这类穴蚀问题的快修技术.提出了用户可操作的缸套的穴蚀问题预防措施,从而有效地延长了柴油机的缸套使用寿命. 相似文献
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基于MapGIS的数模建立方法及其在路线CAD中的应用 总被引:2,自引:0,他引:2
针对公路勘测设计一体化的特点与要求,论述应用GIS技术采集公路地面数据和建立数字地面模型的方法;研究MapGIS系统在公路选线和CAD中的应用。在分析地理信息系统与公路勘测设计关系的基础上,根据我国公路路线设计CAD发展的实际情况,提出基于MapGIS平台进行公路路线设计应用软件开发的建议。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(2-3):203-223
This paper addresses the development of driver assistance systems whose functional purposes are to provide both adaptive cruise control (ACC) and forward collision warning (FCW). The purpose of the paper is to combine concepts from human factors psychology, vehicle-dynamics, and control theory, thereby contributing to the body of knowledge and understanding concerning human-centered approaches for designing and evaluating driver assistance systems. Conceptual and experimental results pertaining to driving manually and with the assistance of ACC and FCW are presented. The following human-centered aspects of driver-assistance systems are analyzed and presented: the looming effect; including rule-based and skill-based behavior in the design of ACC systems; using desired dynamics in controlling the driving process; braking rules that trade headway range for deceleration level; and collision-warning rules based on two different stress indicators. Field-test data are examined to justify and verify the parametric values selected for use in human-centered ACC systems. Measured data from on-road driving are used to evaluate the performance of proposed FCW systems in braking situations. The paper concludes with observations concerning the difficulty of developing a clear understanding of when and why drivers brake. 相似文献
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P. Fancher Z. Bareket R. Ervin 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2001,36(2):203-223
This paper addresses the development of driver assistance systems whose functional purposes are to provide both adaptive cruise control (ACC) and forward collision warning (FCW). The purpose of the paper is to combine concepts from human factors psychology, vehicle-dynamics, and control theory, thereby contributing to the body of knowledge and understanding concerning human-centered approaches for designing and evaluating driver assistance systems. Conceptual and experimental results pertaining to driving manually and with the assistance of ACC and FCW are presented. The following human-centered aspects of driver-assistance systems are analyzed and presented: the looming effect; including rule-based and skill-based behavior in the design of ACC systems; using desired dynamics in controlling the driving process; braking rules that trade headway range for deceleration level; and collision-warning rules based on two different stress indicators. Field-test data are examined to justify and verify the parametric values selected for use in human-centered ACC systems. Measured data from on-road driving are used to evaluate the performance of proposed FCW systems in braking situations. The paper concludes with observations concerning the difficulty of developing a clear understanding of when and why drivers brake. 相似文献