哈—肇公路级配碎石过渡层试验段技术简介

针对柔性基层的技术要求,结合哈尔滨—肇兴公路建设,简要介绍了级配碎石过渡层试验段的技术特点和施工工艺。     

Delay Restoration of Single-Track Railway Rescheduling

On the basis of analysis of the principle of delay restoration in a disturbed schedule, a heuristic algorithm for rescheduling trains is developed by restoring the total delay of the disturbed schedule. A discrete event topologic model is derived from the original undisturbed train diagram and a back propagation analysis method is used to label the maximum buffer time of each point in the model. In order to analyze the principle of delay restoration, the concept of critical delay is developed from the labeled maximum buffer time. The critical delay is the critical point of successful delay restoration. All the disturbed trains are classified into the strong-delayed trains and the weak-delayed trains by the criterion of the critical delay. Only the latter, in which actual delay is less than its critical delay, can be adjusted to a normal running state during time horizon considered. The heuristic algorithm is used to restore all the disturbed trains according to their critical details. The cores of the algorithm are the iterative repair technique and two repair methods for the two kinds of trains. The algorithm searches iteratively the space of possible conflicts caused by disturbed trains using an earfiest-delay-first heuristics and always attempts to repair the earliest constraint violation. The algorithm adjusts the weak-delayed trains directly back to the normal running state using the buffer time of the original train diagram. For the strong-delayed trains,the algorithm uses an utility function with some weighted attributes to determine the dynamic priority of the trains, and resolves the conflict according to the calculated dynamic priority. In the end, the experimental results show that the algorithm produces ＂good enough＂ schedules effectively and efficiently in disturbed situations.     

低剂量水泥稳定碎石在渝湛高速公路中的应用

针对传统半刚性路面基层刚度过大、容易诱发各种早期破坏的问题,采取了柔化半刚性基层的方法,即合理地降低基层的模量.一方面,这样并不会降低路面的结构承载力;另一方面,基层模量与沥青混凝土面层模量的合理匹配,使面层内的剪应力和层底拉应力均控制在较低的应力水平,避免了早期损坏的发生.同时,结合国道主干线渝湛高速公路高桥～遂溪公路的建设,系统地提出了低剂量水泥稳定碎石的施工方法和控制指标,对于国内类似工程具有指导意义,同时也为道路设计理论的发展提供有益的借鉴.     

冲压稳固技术在水泥混凝土路面维修加铺工程中的应用研究

针对西部地区大量旧水泥混凝土路面损坏严重的现状，介绍采用冲压稳固技术处治破损的水泥混凝土路面板作为底基层，水泥稳定碎石作为基层补强，简易加铺的水泥混凝土路面维修加铺技术。     

单片微机在地基系数测试中的应用

介绍单片微机用于地基系数测试装置中的特点,以及该测试系统的硬、软件设计原理.     

SMA路面技术在美国的发展

由于SMA路面在抗车辙、抗裂和耐久性等方面的优良性能，美国自90年代初从欧洲引进这项技术以来，便在重交通道路上获得成功的应用，并取得迅速发展，迄今建成的SMA项目已超百项。美国根据自身的气候条件，对SMA混合料的组成作了重大调整，对SMA混合料的性能进行了深入系统的研究，提出了符合美国实际情况的设计和施工方法，把SMA路面技术发展到一个新的水平。     

秦沈线路基碎石土填筑施工技术

秦沈客运专线对路基质量要求很高，本文就碎石土填筑施工工艺和质量控制作了介绍，意在总结和探讨高速铁路路基施工的经验。     

沿海高速公路夯扩碎石挤密桩处理砂土液化的应用

唐山南部沿海地区分布有较大范围以亚粘土、细砂土为地表的地层,细砂土层虽地基承载力不算太低,不是软弱层,但属液化土层。夯扩碎石挤密桩除挤密作用外,还具有排水功能,能有效地消散由于震动引起的超静孔隙水压力,从而使液化现象大为减轻。另外,碎石桩还有无污染、造价较低等优点。