The price of uncertainty in pavement infrastructure management planning: An integer programming approach

Currently there is a true dichotomy in the pavement maintenance and rehabilitation (M&R) literature. On the one hand, there are integer programming-based models that assume that parameters are deterministically known. On the other extreme, there are stochastic models, with the most popular class being based on the theory of Markov decision processes that are able to account for various sources of uncertainties observed in the real-world. In this paper, we present an integer programming-based alternative to account for these uncertainties. A critical feature of the proposed models is that they provide – a priori – probabilistic guarantees that the prescribed M&R decisions would result in pavement condition scores that are above their critical service levels, using minimal assumptions regarding the sources of uncertainty. By construction of the models, we can easily determine the additional budget requirements when additional sources of uncertainty are considered, starting from a fully deterministic model. We have coined this additional budget requirement the price of uncertainty to distinguish from previous related work where additional budget requirements were studied due to parameter uncertainties in stochastic models. A numerical case study presents valuable insights into the price of uncertainty and shows that it can be large.     

水泥-乳化沥青混凝土研究与应用

研究了水泥乳化沥青混凝土的各项路用性能及其主要影响因素,并结合实际工程对其应用情况作了分析,结果表明,水泥乳化沥青混凝土的各项路用性能指标较好,将其作为一种新兴路面材料应用于路面工程,能够得到较好的效果,同时有较大的实际推广应用价值。     

浅谈高速公路路面施工安全管理方法

文章通过分析当前高速公路路面施工安全状况,划分高速公路路面施工危险区域,找出存在的危险控制点,确定项目重大危险源。同时针对项目施工主要危险区域及危险控制点,提出了高速公路路面现场施工安全管理方法。     

A competing Markov model for cracking prediction on civil structures

Cracks on the surface of civil structures (e.g. pavement sections, concrete structures) progress in several formations and under different deterioration mechanisms. In monitoring practice, it is often that cracking type with its worst damage level is selected as a representative condition state, while other cracking types and their damage levels are neglected in records, remaining as hidden information. Therefore, the practice in monitoring has a potential to conceal with a bias selection process, which possibly result in not optimal intervention strategies. In overcoming these problems, our paper presents a non-homogeneous Markov hazard model, with competing hazard rates. Cracking condition states are classified in three types (longitudinal crack, horizontal crack, and alligator crack), with three respective damage levels. The dynamic selection of cracking condition states are undergone a competing process of cracking types and damage levels. We apply a numerical solution using Bayesian estimation and Markov Chain Monte Carlo method to solve the problem of high-order integration of complete likelihood function. An empirical study on a data-set of Japanese pavement system is presented to demonstrate the applicability and contribution of the model.     

基于虚拟试验场的强化路面建模方法研究

虚拟试验场是依据某汽车试验场建立的,可用于在仿真环境下对车辆进行路试试验。虚拟试验场的路面建模需要保证具有实际路面特性,文章针对虚拟试验场建立中强化路面的建立问题进行研究,提出一种方法,可以准确的建立虚拟试验场的强化路面。利用双轨路面计测量强化路面的不平度,对测试数据进行分析处理,保证测量结果的准确性,应用试验场规则路面的详细尺寸信息建立模拟路面。对于规则强化路面,应用实际尺寸和技术规范等信息建立,对于不规则强化路面,利用实际测量的路面不平度,通过功率谱估计、路面等级分析、路面不平度数字化等建立模拟路面。通过相关性分析,保证所建立的模拟路面的准确性和可信性。     

桥梁空心板铰缝失效分析与防治

随着交通的快速发展,大型载重车的数量在逐年增加,造成桥面铰缝过早损坏,缩短桥面的使用寿命。文章以空心板桥梁铰缝失效为例,分析了公路桥梁铰缝失效的原因及危害性,提出了相应的防治措施,并着重就铰缝的优化设计进行了探讨。     

沥青路面养护中如何合理配备压路机

本文就县级公路部门在道路养护中压路机配置的问题,使用沥青路面养护理论压实工作量、工作能力和压路机理论配置量的概念,从机务管理机构体制、操作人员素质、施工组织配合等方面进行分析,帮助机务管理人员较为实际地配备压实机械.     

沥青路面抗滑表层的设计与对比分析

结合国内外最新研究成果,针对某试验路的特点,选择确定了试验路采用的3种抗滑表层混合料类型以及混合料采用的设计方法和技术指标。继而全面对比分析了3种抗滑表层在级配、沥青用量波动下各混合料体积参数的变化以及抗车辙与水损害性能。试验结果表明:当级配、沥青用量发生波动时,AK 13A对混合料体积参数影响最大,其次为Superpave 13,AC 13K最小;在路用性能方面AC 13K较AK 13A、Superpave 13均有不同程度的改善与提高。试验路检测结果表明:AC 13K与Superpave 13使用性能均达到或超过规范的要求,具有良好的平整度、防渗水能力;AK 13A尽管具有较大构造深度,但防渗水能力较差。这些为选择合适的抗滑表层提供了可靠依据。     

永连公路k22整体滑坡带病害整治

对永连公路其滑坡带病害的机理进行分析,建议对该处病害的整治方案及办法,并提出边坡整治应注意的问题.     

水泥混凝土路面12小时内通车快速修复技术研究

文章对预制拼装6h快通技术,现浇12h快速修复技术进行了分析。从理论上提出了预制板弯拉强度和几何尺寸的确定方法,阐明了预制拼装修复技术的各道施工工艺。研究了SBTK10型快速修补剂的性能,结果表明,SBTK10型快速修补剂具有良好的施工性能、早期强度发展快、微膨胀、后期强度不倒缩、脆性低、耐久性好等优点,可满足高速公路水泥路面12h整板全厚修复通车的要求。