Optimizing horizontal alignment of roads in a specified corridor

Finding an optimal alignment connecting two end-points in a specified corridor is a complex problem that requires solving three interrelated sub-problems, namely the horizontal alignment, vertical alignment and earthwork optimization problems. In this research, we developed a novel bi-level optimization model combining those three problems. In the outer level of the model, we optimize the horizontal alignment and in the inner level of the model a vertical alignment optimization problem considering earthwork allocation is solved for a fixed horizontal alignment. Derivative-free optimization algorithms are used to solve the outer problem. The result of our model gives an optimal horizontal alignment in the form of a linear-circular curve and an optimal vertical alignment in the form of a quadratic spline. Our model is tested on real-life data. The numerical results show that our approach improves the road alignment designed by civil engineers by 27% on average, resulting in potentially millions of dollars of savings.     

高等级公路沥青路面平整度施工控制的探讨

结合高等级公路的施工实践，分析了影响沥青路面平整度的主要因素，提出保证沥青路面平整度的控制措施和对策。     

公路主枢纽货运站场向物流园区转化的可能与模式

公路主枢纽货运站场具有向物流园区转化的基本条件.已建成、在建或规划中的各公路主枢纽货运站场可结合站场现有的区位、设施、能源和土地等条件,采取不同模式,实现向物流园区转化的目标.     

古朴文化的新生命--宁夏高速公路管理中心建筑设计

如何利用建筑语言营造城市，保护、继承和发展城市的人文特质，建构城市文化？文章论了在“宁夏高速公路管理中心”这一建筑方案设计中，笔者对上述问题进行了一些尝试与探索。     

喷射早强钢纤维混凝土在补强矿区铁路公铁立交桥中的应用

矿区铁路沉降引起公铁立交桥产生裂缝 ,用喷射早强钢纤维混凝土来进行补强加固 ,体现了早强钢纤维混凝土具有初期强度高和优良的抗拉性、抗裂性和柔韧性等特点。通过试验和施工取得了良好的效果     

Methodology for development of live load models for refined analysis of short and medium-span highway bridges

Abstract

The accuracy of bridge system safety evaluations and reliability assessments obtained through refined structural and finite element analyses depends not only on the accuracy of the structural model itself but also on the proper modelling of the maximum traffic loads. While current code-specified live load models were calibrated to properly reflect the safety levels of bridge structures analysed using the simplified methods adopted in bridge design and evaluation manuals, these load models may not lead to accurate results when implemented during refined structural analysis procedures. This paper describes a method to calibrate appropriate live load models that can be used for advanced analyses of bridges. The calibration procedure is demonstrated using actual traffic data collected at a representative weigh-in-motion station in New York State. The proposed calibration methodology is applicable for developing live load models for different bridge service periods, bridge types and design/assessment codes or standards. Live load models obtained using the proposed calibration procedure are readily implementable for deterministic refined analyses of highway bridges to produce similar results to those of complex traffic load simulations. Examples are presented that describe how results of such calibrated live load models would be used in engineering practice.     

川藏公路G317线H3滑坡稳定性分析

川藏公路G317线K1553＋776～K1553＋957处滑坡位于雍达曲左岸岸坡上。勘察了解了滑坡形成的过程,查明了滑坡的分布范围、滑坡所处的地质条件以及滑动面的位置,对该滑坡稳定性做了定性定量分析,认为该滑坡在持续降雨和地震的共同作用下容易产生次生滑坡,而且滑坡治理难度大,建议线路宜展线至对岸较稳定一侧。     

配电自动化系统在高速公路10KV中压电网中的应用探讨

近几年伴随着山区高速公路路网的大规模建设隧道数量不断增加,为满足隧道通风照明及沿线其它交通智能化设备供电需要,山区高速公路沿线逐渐形成10KV中压配电网络,为确保该电网的安全可靠运行,本文针对配电自动化系统在高速公路10KV配电网络运行管理中的应用进行了探讨。     

福建省普通公路绿化设计初探

通过系统阐述福建省普通公路的绿化现状、设计原则与主要设计内容,从一般路段、特殊绿化点、连续密植型路段、边坡防护以及公路绿化苗木选用几方面探讨了福建省普通公路绿化设计要点与实践准则,以期为福建省普通公路绿化建设与实践应用提供参考。     

基于社会视角的PPP高速公路收费价格及期限研究

PPP模式可以有效地缓解政府投资基础设施建设的财政压力,促进区域经济发展和社会进步,目前已成为我国政府提供高速公路等基础设施的重要模式之一。然而,在PPP高速公路项目实施过程中存在的社会不利影响和社会可接受性问题,如收费价格与收费期限设定的不合理、缺乏公众参与、经营权转让程序不规范等,使得目前国内一些PPP高速公路未达到预期的效果,遭到很大的质疑。文章针对调研中反映出的关键社会影响因素,即收费价格、收费期限和政府表现因素,进行详细分析并提出改进建议。