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山西运煤干线水泥混凝土路面损坏分析与典型结构研究
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摘要
基于山西省重载水泥混凝土路面(运煤干线)在开放交通的不长时间(3-5年)就损坏严重、难于满足货运交通需求的状况。从重载水泥混凝土路面损坏状况调查(如破碎、断裂、唧泥、错台、平整度和磨光等病害)和运煤车辆荷载参数及轴载谱统计入手,分析了重载水泥混凝土路面发生破坏的各种原因,总结了结构设计和结构组合的成败得失;讨论了运煤干线货运车辆的轴载谱及累计轴载预估;采用平面不等尺寸水泥混凝土路面结构力学模型,分析了重载(运煤车辆)作用下路面结构面层和基层的结构临界点,归纳了相应的荷载应力计算式;建立了以控制面层和基层综合疲劳断裂作为设计准则的重载水泥混凝土路面设计方法;基于山西省运煤干线的使用要求,提出了适应重载交通的水泥混凝土路面典型结构,所得研究结论如下:
     (1)依据山西省重载水泥混凝土路面损坏状况调查数据,分析了重载水泥混凝土路面发生破坏的各种原因,归结为三个方面:车辆超载超限运输;设计理论和方法未充分适应重载交通的需求;工程建设中未很好地把握关键技术,工程质量监控力度不够。
     (2)在调查和轴重实测的基础上,讨论了运煤干线的轴载谱及其统计特征,即大轴荷(2~3倍标准轴载)、高轮压(1.2~1.5MPa)和多轴化(双联轴、三联轴车辆比例高)的特点,给出了基于轴载谱的累计轴载预估方法。
     (3)采用分析刚性和半刚性基层上水泥混凝土路面结构的力学模型——Winkler地基上双层平面尺寸不尽相同结构模型,分析了荷载作用下路面结构面层和基层的结构临界点变化,基层超宽和荷载内移对面层、基层荷载应力的影响,归纳了各种情况下的荷载应力计算式。
     (4)考虑车辆荷载和温度变化综合作用下的疲劳破坏,建立了以控制面层和基层疲劳断裂作为设计准则的重载水泥混凝土路面设计方法。
     (5)研究了重载水泥混凝土路面合理的结构组合,依据建立的控制面层和基层疲劳断裂作为设计准则的重载水泥混凝土路面设计方法,按累计轴载(标准轴载或设计轴载)作用次数不同,给出了刚性基层(贫混凝土、碾压混凝土)和半刚性基层(沥青混凝土)上重载水泥混凝土路面典型结构。
     (6)铺筑了试验路,包括普通混凝土路面、钢筋混凝土路面和连续配筋混凝土路面,对路面实际使用效果进行了跟踪观测,初步验证了本文提出的重载水泥混凝土路面典型结构的适用性。
     研究结果具有较好的系统性,对指导山西省重载水泥混凝土路面结构设计和应用具有十分重要的意义。
Based on the structure damage characteristics of Shanxi heavy load cement concrete pavement on the traffic open not a long time (3to5years),it difficult to meet the needs of freight traffic conditions. Through the Survey of cement concrete pavement about Heavy damage (such as crushing, breaking, jack mud, dislocation, smoothness and polish and other diseases), and coal traffic load parameters and load spectra statistics, the paper analyzes a variety of reasons of the occurrence of heavy damage to the cement concrete pavement, summed up the success or failure of structural design and structural combination; discussed axle load spectrum of Coal Route and the cumulative axle prediction;adopted varying size of cement concrete pavement structural mechanics model to analyze the critical point of the pavement structure surface and base under the heavy load(coal vehicles), summed up the design methods of Coal Route cement concrete pavement based on the surface and base comprehensive fatigue damage as a design guidelines.Based on the used request of coal route in Shanxi,the paper proposed the typical structure of Coal Route to adapt to heavy traffic. The main findings obtained are as follows:
     (1) according to the survey data of structure damage condition of Shanxi heavy load cement concrete pavement,the pape analyzed variety damage reasons of the heavy load cement concrete pavement,which attributed to three aspects:overload transportation vehicles; design theory and methods not fully meet the needs of traffic demand; not grasp the key technology in construction;quality control not enough
     (2) Based on the investigation and axle load measurement, the paper discussed the axle-load spectrum and their statistical characteristics of Coal Route, such an large axle load (2to3times the standard axle load), high wheel pressure (1.2~1.5MPa) and the axis of the (double axle, triple axle vehicles, a high proportion), and gave cumulative axle prediction method based on axle-load spectrum.
     (3) Adopting the analyzing cement concrete pavement structure on the rigid and semi-rigid base-Winkler structure model of the different double-layer plane size on the ground. the paper analyzed the change of critical point of the pavement structure surface and base under the load,the affects of wide grass-roots of base and shift within the layer and the base load stress, and summed the load stress calculation formula under the various conditions
     (4) considering fatigue failure under the combined effects of vehicle load and temperature changes,the paper established the design methods of Coal Route cement concrete pavement based on the surface and base comprehensive fatigue damage as a design guidelines.
     (5) Studing the sensible structure combination of heavy cement concrete pavement, according to the the design methods of Coal Route cement concrete pavement based on the surface and base comprehensive fatigue damage as a design guidelines and the times of cumulative axle load (standard axle load or design axle load) the paper given the typical structure of rigid base (lean concrete, RCC) and the semi-rigid base (asphalt concrete) on a heavy cement concrete pavement
     (6) paving a test road, including ordinary concrete pavement, reinforced concrete pavement and continuously reinforced concrete pavement and tracking and ovservting the used effects of the pavement, the paper tested and verified the proposed typical structure applicability of heavy cement concrete pavement
     Studied result has good Systematic, it has great significance to the guidance of the structure of Shanxi cement concrete pavement design and application.
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