路面破损自动识别的一种新算法

针对路面破损分类这一难题,提出了一种基于破损密度因子的路面破损分类新算法。对破损密度因子进行了定义和仿真实验,仿真结果表明其对5种常见的路面破损状况的分类效果非常理想。为了进行对比,文中还选择了美国博士论文中的PROXIMITY算法进行比较,两种方法对相同的10几万幅路面样本进行分类试验,试验结果表明,笔者提出的基于破损密度因子的路面破分类方法,整体优于PROXIMITY方法的分类效果。     

南方地区冰冻灾害后沥青路面典型病害发展原因探讨

为研究冰冻灾害后路面病害加剧发展的灾变机理,文章从冰冻灾害期间及灾后气候因素变化入手,分析了冰灾前后不利的气候因素与路面病害之间的相关性,并结合路面病害调查与芯样破坏特征揭示了冰灾期间及后期路面病害发展加剧的原因与扩展过程。     

Co-location decision tree for enhancing decision-making of pavement maintenance and rehabilitation

This paper presents a new decision tree induction method, called co-location-based decision tree (CL-DT), to enhance the decision-making of pavement maintenance and rehabilitation strategies. The proposed algorithm utilizes the co-location characteristics of spatial attribute data in the pavement database. The paper first presented the co-location mining algorithm, including spatial attribute data selection, determination of rough candidate co-locations, determination of candidate co-locations, pruning the non-prevalent co-locations, and induction of co-location rules, and then focused on the development of the co-location decision tree (CL-DT) algorithm, which includes the non-spatial attribute data selection, co-location algorithm modeling, node merging criteria, and co-location decision tree induction. A pavement database covering four counties, which are provided by North Carolina Department of Transportation (NCDOT), is used to verify the proposed method. The experimental results demonstrated that (1) the proposed CL-DT algorithm can make a better decision, and has higher accuracy than the existing decision tree methods do; (2) the training data can be fully played roles in contribution to decision tree induction and the computational time taken for the tree growing, tree drawing and rule generation is largely decreased; (3) quantity and locations of six treatment strategies proposed by the ITRC and by CL-DT is much close for each treatment strategy.     

浅论如何提高高等级公路沥青路面的耐久性

对高等级路面耐久性的影响因素及应采取的主要措施进行粗浅的论述.旨在引起设计和施工部门的足够重视.努力提高高等级路面的使用年限,增加耐久性,提高社会经济效益.     

拓宽旧水泥混凝土路面板纵向断裂成因机理分析

基于301国道阿城(刘秀屯)至亚布力段和同三公路哈尔滨至方正段的多处水泥混凝土路面板纵向断裂试验研究,分析了拓宽旧路面各结构层,如垫层对基层及基层对板体不均匀支承的分布规律和成因特征,并据此建立模型,应用有限元方法对不同车辆荷载作用下板体内最大弯拉应力进行求解。计算结果表明,水泥混凝土路面板下基层的近条带状不均匀支承是造成水泥混凝土路面板纵向断裂的重要原因。     

沥青混凝土面层施工工艺控制

主要从沥青混凝土道路路面的施工准备、实际施工以及检测验收环节,探讨了沥青混凝土面层的具体施工控制措施。     

Predicting asphalt pavement crack initiation following rehabilitation treatments

Prolongation of the service life of pavements requires efficient prediction of the performance of their structural condition and particularly the occurrence and propagation of cracking of the asphalt layer. Although pavement performance prediction has been extensively investigated in the past, models for predicting the cracking probability and for quantifying impacts of associated explanatory factors following pavement treatment, have not been adequately investigated in the past. In this paper the probability of alligator crack initiation following pavement treatments is modeled with the use of genetically optimized Neural Networks, The proposed methodological approach represents the actual (observed) relationships between of probability of crack initiation and the various design, traffic and weather factors as well as the different rehabilitation strategies. Data from the Long Term Pavement Performance (LTPP) Data Base and the Specific Pavement Study 5 (SPS-5) are used for model development. Results indicate that the proposed approach results in accurately predicting the probability of crack initiation following treatment; furthermore it provided information on the relationship between external factors and cracking probability that can help pavement managers in developing appropriate rehabilitation strategies.     

A joint bottom-up solution methodology for system-level pavement rehabilitation and reconstruction

We present a methodology for the joint optimization of rehabilitation and reconstruction activities for heterogeneous pavement systems under multiple budget constraints. The proposed bottom-up approach adopts an augmented condition state to account for the history-dependent properties of pavement deterioration, and solves for steady-state policies for an infinite horizon. Genetic algorithms (GAs) are implemented in the system-level optimization based on segment-specific optimization results. The complexity of the proposed algorithm is polynomial in the size of the system and the policy-related parameters. We provide graphical presentations of the optimal solutions for various budget situations. As a case study, a subset of California’s highway system is analyzed. The case study results demonstrate the economic benefit of a combined rehabilitation and reconstruction budget compared to separate budgets.     

高比例RAP厂拌热再生沥青混合料在广惠高速公路试验与评价

针对高比例厂拌RAP热再生沥青混合料开展了应用研究,通过小梁弯曲试验对比评价了RAP比例分别为0％、30％、45％的热再生沥青混合料变形性能,并对RAP比例分别为0％、30％、45％的热再生沥青混合料在广惠高速公路开展了试验段研究,检测评价了试验路的抗车辙、弯沉及回弹模量特点,分析了高比例RAP热再生沥青路面性能特点,总结了高比例RAP厂拌热再生沥青路面试验段应用情况.     

脱空水泥混凝土路面板灌浆加固材料的配制及施工

根据脱空水泥混凝土路面板加固工程对灌浆材料的要求，通过试验配制出了同时兼具早强、高强、大流动性、微膨胀等优良性能的浆体材料。