道路工程是国民经济发展的重要公共基础设施之一,机器学习是提高道路工程领域数字化、自动化和智能化的重要方法.为全面了解机器学习在道路工程领域的发展及应用,在阐述机器学习基本理论的基础上,分析机器学习在道路工程材料、设计、施工、运维和预测方面的研究现状.研究表明,道路工程领域已开展了不少机器学习研究,但道路工程各方面机器学习智能化发展存在不足,实际应用存在一定局限性;未来发展需深入探索大数据、深度学习、神经网络等智能技术在道路工程全生命周期的融合,促进道路工程领域机器学习等智能研究发展.

Based on material properties, the paper studied the influence of rock asphalt as modifier on high temperature performance of base asphalt. The influence of rock asphalt content on high temperature deformation resistance is analyzed by dynamic frequency scanning test and repeated loading test. The research data show that rock asphalt modifier can significantly improve the dynamic shear modulus and of the asphalt, reduce the phase angle and enhance the deformation resistance at high temperature by the increase of rock asphalt content. Compared with SBS modifier, the rheological behavior of rock asphalt modified by 20% rock asphalt is quite different. The high temperature deformation resistance of rock asphalt modified by 20% rock asphalt is comparable to that of SBS modified asphalt at 40℃ but with the temperature increasing, the mineral precipitation in the material is caused, and the high temperature deformation resistance is lower than that of SBS modified asphalt. Based on Burgers model fitting data, high temperature performance index was used to quantitatively explain the significant effect of mineral settlement on high temperature performance of rock asphalt modified asphalt.

基于动态温度扫描试验对TLA混沥青的高温粘弹性能进行了研究,通过对TLA混合沥青的高温动态粘弹性能的变化规律以及Han曲线的温度依赖性进行分析,得出了TLA混合沥青的储存模量和损耗模量随温度和TLA掺量的变化规律,并比较了不同掺量的TLA混合沥青与基质沥青Han曲线的差异,根据这个差异可以很好的评价TLA混合剂与基质沥青的相容性.研究结果表明了该试验可以很好地分析TLA混合沥青的高温粘弹性能,从而为更好地为推广应用TLA混合沥青提供理论依据.

依托开阳高速公路改扩建工程,采用三维探地雷达和落锤式弯沉仪检测旧路面内部损坏、弯沉、结构层模量,评价旧路面状况和制定病害处治方案;采用红外成像仪、无核密度仪和三维探地雷达检测加铺层的施工温度、空隙率和厚度均匀性.旧路面病害具有隐蔽性和发展特性,三维探地雷达可识别路面内部已形成的病害特征,落锤弯沉仪可识别内部发展中的损伤特征.无损检测技术有利于公路改扩建旧路面病害处治和沥青加铺层的施工质量控制.

文中研究了废旧PE类材料加工利用制备沥青混合料高性能改性剂,制备高模量沥青混合料,提出了在珠三角地区适合于该类材料沥青路面的设计控制参数,在节约沥青路面造价的基础上提高沥青混合料的路用性能,研究成果将对珠三角地区乃至国内相关地区高等级沥青路面的建设具有重要的参考价值.

基于FWD路表弯沉盆特征分析相应数学模型拟合条件,分析Sigmoid函数曲线与其相似型,并将该模型用于拟合不同路面状况的检测弯沉盆,分析拟合不同路面的精度变化,寻求了可以减少理论弯沉盆和实测弯沉盆差异的方法,得出函数Sigmoid曲线用于拟合路面弯沉盆的精度随着路面性能状况PCI的值变大而递增,曲线的形态随PCI差值变化增大而陡增的特点,这些规律将为今后路面健康管理评价提供借鉴.

本文结合近几年我校应用型本科院校工程管理专业实践教学体系运行的现状以及存在问题,对工程管理专业的实践教学体系进行探讨和分析,并给出相应建议,为后续我校工程管理专业的发展提供借鉴.

This paper firstly studies the changes of cold patch asphalt and asphalt basic performance and viscosity, then draws a cold patch asphalt viscosity-temperature curve;and indicates the temperature optimum mixing cold patch asphalt,based on the adhesion of asphalt,liquid theory of surface tension and the contact angle of asphalt and aggregate theory;measures the contact angle between the cold patch asphalt and the surface tension data by contact angle analysis instrument and surface tension meter. Test results and analysis concludes the performance characteristics index of cold patch asphalt.

As a kind of good steel deck pavement materials,the high temperature performance of the Mastic Asphalt mixture has become the focus. This study based on indoor rutting experiment,focuses on the load and temperature, mixing time and paving asphalt mastic SMA mixes. The results will provide a reference to the mastic asphalt mixture application.

采用动态剪切流变仪研究了全天候冷补沥青的动态流变特性,得到以下结论:随着温度的升高,冷补沥青的损耗模量小于基质沥青的损耗模量,大约相差1.2个数量级;冷补沥青的车辙因子随着温度的升高而迅速降低,其车辙因子比基质沥青要小1～2个数量级,冷补沥青材料G*的对数值与荷载作用频率的对数值呈现类似线性关系;在荷载频率较低时,冷补沥青的相位角要比基质沥青的相位角大8～10°,而且随着荷载频率的增大冷补沥青的相位角逐渐减小,但减小的幅度明显比基质沥青小;当荷载作用频率为0.1 rad/s时,冷补沥青的储能模量和损耗模量比基质沥青小2个数量级.

根据冲击压实和低速车轮扁疤撞击轨道机理的相似性,引入了一种简化的冲击压实冲击速度的表达公式,并依据破碎机理,分析冲击压实对旧水泥混凝土路面和基础的影响,并参考车轮扁疤的动力学效应,引入中低频冲击力及其表达公式,分析控制冲击压实的中低频冲击力在工程中的重要实际意义.

Combined application-oriented features of road and bridge professional training with CDIO engineering education philosophy,the concept of application-oriented CDIO Curriculum bridge and target system are discussed. Throughout the whole process of teaching course, students are guided to learning actively by problems-oriented method and to explore academic. so that students' theoretical and practical ability,innovation ability and teamwork abilities are improved.

通过建立有限元模型，采用瞬态动力学加载方法，模拟冲击压路机破裂稳固旧水泥混凝土路面的冲压效果，探讨冲压荷载作用下土基中的应力传递规律和沉降变形．结果表明：在土基顶面以下5 m深度处由冲压荷载引起的土基竖向应力和位移均接近于0，冲压荷载的影响深度不超过5 m；冲压荷载作用下路基的工作区为2．25 m深度范围内，埋深超过2．25 m的构造物理论上不受冲压荷载的影响．

本文针对当前我校高职路桥专业实践教学运行体系的现状,结合自身的实践教学经验,总结出对路桥专业实践教学运行体系的教学目标体系、教学内容体系、教学方法体系的改革方法,并对这些改革方法进行了探讨。

依托多条雾封层养护措施试验路段的施工实践，对雾封层措施的施工艺及养护措施的路用效果进行评价，评价指标主要包括抗滑摆值、路面构造深度及路面渗水系数，结果表明：雾封层措施对这3个指标值都有明显的改善，达到了减少水损害和延长道路寿命的目的，但在施工中，应严格注意针对具体的路段采用合适的雾封层措施中乳化沥青的比例，达到最佳的养护效果。

This paper applies dynamic mechanical analysis method to study the dynamic rheological properties of common asphalt and TLA modified asphalt in high-temperature;and measures the temperature and frequency parameters of the dynamic rheological properties within a certain range;and analyses the impact of the variation of the rheological properties of asphalt TLA through the analysis of different dosage TLA modified asphalt dynamic performance parameters.The results show that: after adding TLA increased asphalt complex modulus,phase angle decreases while asphalt rutting factor increases.

For accurately analysing the deformation and stress distribution of old cement concrete pavement under stamping load,the appropriate finite element model was established for analysis and calculation,the first strength theory was used to determine the rupture of the old pavement slab,and the failure mechanism of pavement slab under impact compaction was summed up.The result indicates that the model can be used to obtain the deformation and the mechanical characteristics of the old concrete road panels in vertical and horizontal directions,i.e.,longitudinal and horizontal bending occurred in road panel under stamping load,mainly the longitudinal bending deformation of the whole section,the maximum deformation occurred at the position of the pavement slab between two stamping wheels,the settlement deformation subtle changed in the vertical direction of cross-section of pavement slab,and the deformation behavior indicated that the pavement slab will be bending destructed.Under the wheel pressure loads,the upper layer bore compressive stress and the lower layer bore tensile stress,the cut-off point of tension and compression stresses was at the lower position in the pavement slab,most part of the upper layer was in compression state in three directions,and longitudinal compressive stress was almost two times of the transverse compressive stress.

依托肇庆市封开县S266线旧水泥混凝土路面修复工程中冲击压实试验段,对冲击钻冲孔+冲击压实和冲击压实两种不同工艺下施工时对周边的振动效应、路面沉降和弯沉等进行了测试,确定周围地面和建筑物振动衰减的程度,并将两种不同工艺下的振动效果进行了对比分析,探讨冲击压实工艺在乡镇道路中的使用情况.

针对当前我校建筑材料课程实训项目的现状,结合项目化教学的特点和自身的教学实践,总结出对实训项目的教学内容、教学方法的改革方法,并对这些改革方法进行了探讨。

The prediction model of the asphalt pavement performance deterioration is an important part of pavement preventive maintenance.This paper analyses the IRI and PCI indicators to predict the pavement performance by applying a empirical prediction model,and generalizes the establishment procedures and the application characteristics of the empirical prediction model.