高速公路沥青路面病害诊断与养护决策研究

发布时间：2018-04-23 03:13

本文选题：高速公路 + 路面病害诊断　；参考：《重庆交通大学》2015年硕士论文

【摘要】：随着我国高速公路建设的快速发展,高速公路路面质量服务需求日趋增长。提供良好的路面维修决策成为高速公路养护管理的重点。如何对运营中的高速公路实施正确的养护维修、准确的路面病害诊断和科学有效的养护决策成为高速公路养护工作的关键。本文依托广西LB高速公路沥青路面养护管理研究,LB高速公路于2005年底建成通车,至今已运营10年。目前,通过分析其路面技术状况指标PQI和PCI均达到优良,路面总体路况良好。其养护与管理具有良好的借鉴意义。随着使用年限的增加,LB高速公路路面性能整体呈下降趋势,通过对原路面现场调查分析,对其路面病害进行了系统的总结和研究,原路面出现了纵向裂缝、车辙、坑洞和块裂等典型病害。为恢复LB高速公路路面性能,提高道路服务水平,有效利用养护费用,提出科学有效的养护对策。在对LB高速公路原路面进行路面结构及路面病害分析,总结得出主要的4种典型的路面病害类型:填方路段裂缝、车辙、块裂及坑洞。首先,通过选取路面完好、严重车辙、块裂和坑洞等4种典型病害路段进行现场钻芯取样并利用车辙深度检测、路表渗水检测、FWD检测、激光弯沉车检测及室内试验分析作出路面评估探究,得出早期路面病害产生原因主要是上面层孔隙率过大,导致水损害破坏,从而产生坑洞。80%芯样的上水稳基层底部松散,形成厚约20~35mm的软夹层,动荷载作用下上水稳层达到疲劳极限而破坏,造成路面块断。沥青层抗剪强度不足和第二期路面工程施工时中面层表面洒布的粘层沥青过多造成严重车辙现象。然后,通过收集历年交通量,调查当前上行和下行断面交通量和检测车辆轴重及超载情况作出当量轴次分析。同时,通过室内分析计算累计当量标准轴载作用次数,评定路面结构强度,建立路面力学模型,计算路面结构层荷载应力,分析旧路面疲劳损伤和加铺补强结构疲劳寿命,得出病害路段上下水稳层间含15mm松散夹层的路面,疲劳损伤已达68%,完全光滑疲劳损伤已达28%,上下水稳层间粘结良好路面疲劳损伤为9.2%。最后,根据路面检测评估和分析结果,针对4种不同的路面病害状况提出维修对策:(1)PCI90和SSI10.78的路面,采取小修保养措施;(2)PCI90和SSI10.78的路段,路面水稳层间可能存在松散夹层,应予加铺补强;(3)上水稳层底面松散,在上下水稳层间形成20~35mm厚的软弱夹层,上水稳层底面的荷载拉应力过大,多年行车后达到疲劳强度而破坏,应挖除重铺。
[Abstract]:With the rapid development of highway construction in China, the service demand of expressway pavement quality is increasing day by day. Providing good pavement maintenance decision has become the focus of highway maintenance and management. How to carry out correct maintenance, accurate pavement disease diagnosis and scientific and effective maintenance decision become the key of expressway maintenance. Based on the research of asphalt pavement maintenance and management of Guangxi LB Expressway, the LB Expressway was completed and opened to traffic at the end of 2005, and has been in operation for 10 years. At present, PQI and PCI are good, and the overall road condition is good. Its maintenance and management have good reference significance. With the increase of service life, the pavement performance of LB expressway presents a downward trend as a whole. Through the investigation and analysis of the original pavement, the pavement diseases are systematically summarized and studied, and the longitudinal cracks and ruts appear in the original pavement. Typical diseases such as potholes and cracks. In order to restore the pavement performance of LB Expressway, improve the level of road service and make effective use of maintenance expenses, scientific and effective maintenance countermeasures are put forward. Based on the analysis of pavement structure and pavement diseases of LB Expressway, four main types of pavement diseases are concluded: crack, rut, block crack and pothole. First of all, through the selection of four typical diseased sections, such as road surface intact, serious rutting, block crack and pit hole, the field core sampling and the detection of rut depth are carried out, and the road surface water seepage detection and FWD detection are carried out. Laser bending and sinking vehicle detection and laboratory test analysis to make pavement evaluation and research, it is concluded that the main cause of early pavement diseases is that the porosity of the upper layer is too large, resulting in water damage and destruction, thus producing poth.80% core sample of the bottom of the stable base. A soft interlayer of about 20~35mm thickness is formed, and under the action of dynamic load, the upper water stable layer reaches the fatigue limit and is destroyed, resulting in the breaking of the pavement mass. The insufficient shear strength of the asphalt layer and the excessive asphalt spread on the surface of the middle surface during the construction of the second phase of the pavement engineering cause serious rutting. Then, through collecting the traffic volume in the past years, investigating the current traffic volume on the uplink and downlink sections and measuring the axle load and overload of the vehicle, the equivalent axle times are analyzed. At the same time, through indoor analysis and calculation of accumulative equivalent standard axial loads, the strength of pavement structure is evaluated, the mechanical model of pavement is established, the load stress of pavement layer is calculated, the fatigue damage of old pavement and the fatigue life of overlay structure are analyzed. It is concluded that the fatigue damage of the pavement with 15mm loose interlayer between the upper and lower water-stabilized layers of the diseased section has reached 68 and the completely smooth fatigue damage has reached 280.The fatigue damage between the upper and lower water-stabilized layers is good and the fatigue damage is 9.2. Finally, according to the results of pavement inspection, evaluation and analysis, according to the four kinds of pavement disease situation, the paper puts forward the maintenance countermeasures: (1) the road surface of PCI90 and SSI10.78, and take minor maintenance measures, such as the road sections of the road, such as the section of the road surface, the pavement may have loose interlayers between the water-stable layer, and the pavement may have a loose interlayer between the layers of water and stability. The bottom surface of the upper water stabilizing layer is loose and the 20~35mm thick weak intercalation is formed between the upper and lower water stable layers. The load and tensile stress on the bottom surface of the upper water stabilizing layer is too large and it is destroyed by fatigue strength after many years of driving, so it should be excavated and repaved.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217;U418.68

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