重载汽车行驶下班吉—贝洛科路面稳定性研究

发布时间：2018-01-17 14:09

  本文关键词：重载汽车行驶下班吉—贝洛科路面稳定性研究　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 车辆轴载 柔性路面结构 等量轴载换算 等效单轴荷载

【摘要】：在撒哈拉沙漠以南的非洲地区特别是在中非共和国地区(CAR),道路的使用状况和使用寿命主要与以下两个因素密切相关:经济和交通。经济因素是指是道路建设在地区经济不发达的背景之下,并且缺乏维修养护措施。而交通因素是指设计的载重限制不被遵守,车辆总是超载,结果导致路面上的车辆轴重大于路面设计的最大轴载。这些问题不但使路面受到环境影响破坏的效果更加严重;而且还使路面过早的出现了疲劳开裂现象。因此,在此背景之下本文重点研究了在重载车辆荷载作用下柔性路面结构的稳定性问题。对于路面在重型车辆荷载作用下的稳定性研究,本文选择沥青路面应力计算软件(BISAR)来进行分析,为了更好的确定轴载水平与路面性能之间的关系,对路面进行均匀布载,通过BISAR 3.0软件计算承受均布荷载作用下柔性路面的应力、应变和位移,以此衡量路面功能上和结构上的性能的损失(包括功能上的和结构上的),并且评价材料和轮胎的压力对路面性能的影响。对此,首先进行气候变化和交通荷载的分析,气候变化分析包括降雨和温度变化的分析,交通荷载分析包括轮胎接触压力、车轮荷载、移动荷载、重复荷载和轴载组合,研究它们在不同的环境下,轴载与路面性能之间的关系。其次,进行柔性路面结构分析,包括环境和荷载对路面稳定性的影响,以此评估材料和轮胎压力对路面性能的影响。此外,本文主要在中非共和国(CAR)五个不同的气候区下进行了柔性路面结构力学响应和使用性能的研究。在研究中得知柔性路面的使用性能和轴重之间的关系由路面所处的气候条件所决定,对于柔性路面结构设计,要充分考虑到当地的材料和施工技术。此外,文中应用广义四次幂定律来进行等量轴载换算(LEF)。轴载计算中涉及各种轴重组合,计算时采用标准的80k N单轴荷载(18000磅)和标准的151.2k N双轴荷载(34000磅)进行柔性路面结构设计。而且,通过对交通荷载的统计分析,文中对标准轴载进行了等量换算。最后,本文对中非地区的建筑材料和施工技术进行了深刻研究,同时开展了路面使用环境和交通荷载的综合分析,以便在此基础上建立一个适用于不同气候条件的柔性路面性能和材料评定标准。针对垂向荷载对柔性路面的影响进行分析,得出垂向应力和应变对于垂向荷载非常敏感。在较厚的表面层里,垂向荷载增加24%会导致垂向应力和垂向应变分别增长6%和14%。而轮胎压力增长13%导致垂向应力和垂向应变分别增长7%和10%。这个现象与轮胎和路面的接触面积有关,且清楚地表明轮胎压力对垂向应力、应变有质的影响。120k N-1000k Pa交通荷载相比于80k N-700k Pa交通荷载的最高应力应变值(图4-1)和最低疲劳荷载周期都被显示出来。对于四种不同的交通荷载和相似的材料常数,相应的破坏时的疲劳荷载循环次数和模量比都被估计出来。交通荷载量最大时,即120k N-1000k Pa,疲劳荷载循环次数最小。相对于其他交通荷载,这种荷载会导致更多破坏。模量比为10时,80k N-700k Pa的交通荷载的疲劳寿命为5x106次,而1200k N-1000k Pa交通荷载的疲劳寿命只有0.2x106次。疲劳寿命减少了87%,这清楚地反映了交通荷载提高的潜在伤害基于BISAR 3.0柔性路面结构的模拟,发现路面破坏经常发生在汽车轮胎作用的区域。这些破坏是由于正常荷载或者超负荷荷载引起的过大的垂向应力导致的。然而,我们注意到,即使没有交通荷载的影响,路面结构也会由于诸如降雨、显著的温度变化和地下水位的抬升等环境因素而降级。
[Abstract]:In sub Saharan Africa especially in the Central African Republic area (CAR), and the service life of road usage are closely related to the following two factors: economy and transportation. The economic factor is refers to the road construction in the area with undeveloped economy background, and the lack of maintenance measures and traffic. Factor refers to the load limit design are not compliance, vehicles are always overloaded, resulting in the maximum axle load of vehicle axle load is larger than that on the road pavement design. These problems not only make the road under the influence of environment damage effect is more serious; but also make the pavement appeared early fatigue cracking phenomenon. Therefore, under this background this paper focuses on the research of the problem of stability of flexible pavement under vehicle load. The effect of heavy load for stability of pavement under heavy load vehicle, the asphalt road surface The force calculation software (BISAR) to analyze, in order to better define the relationship between the level of axle load and pavement performance, uniform load on the pavement, through the BISAR 3 software to calculate the stress of flexible pavement under uniform load, strain and displacement, in order to measure the performance of pavement function and structure of the loss (including the function and structure of the impact and evaluation of materials), and tire pressure on pavement performance. In this regard, the first analysis of climate change and the traffic load and climate change analysis of rainfall and temperature change, the traffic load analysis including tire contact pressure, wheel load, moving load and repeated load and the axle combination, and studies them in a different environment, the relationship between axle load and pavement performance. Secondly, analysis of flexible pavement structure, including the influence of environment and load on the stability of this. Impact assessment materials and tire pressure on pavement performance. In addition, this paper mainly in the Central African Republic (CAR) five different climatic zones were studied and the performance of the structural mechanics response of flexible pavement. In the study that the relationship between flexible pavement performance and the weight of the pavement by climatic conditions the decision for the flexible pavement structure design, should give full consideration to the local materials and construction techniques. In addition, for equivalent axle load conversion using the generalized four power law (LEF). This paper relates to various combinations of axle load axle load calculation, calculation using the standard 80K N single axle load (18000 pounds) and the standard 151.2k N biaxial load (34000 pounds) of flexible pavement design. Moreover, based on the statistical analysis of the traffic load, the standard axle load of equivalent conversion. Finally, the non area of building materials and Application Technology of deep research, at the same time to carry out a comprehensive analysis of pavement environment and traffic load, so as to build a suitable for different climatic conditions of the flexible pavement performance and material standards. According to the vertical load effect on flexible pavement is analyzed, the vertical stress and strain for vertical the load is very sensitive. In the surface layer of thick, vertical load increasing the contact area of 24% will cause the vertical stress and vertical strain increased 6% and 14%. increased 13% tire pressure leads to the vertical stress and vertical strain increased 7% and 10%. and the phenomenon of tire and road surface, and clear that the tire pressure on the vertical stress and strain with the highest quality.120k N-1000k Pa 80K N-700k Pa compared to the traffic load of traffic load stress and strain (Figure 4-1) and the minimum fatigue load cycle are shown Four. For different traffic loads and similar material constants, the corresponding failure of fatigue load cycles and modulus ratio are estimated. The maximum traffic load, namely 120K N-1000k Pa, the number of loading cycles. The minimum fatigue compared to other traffic load, the load will cause more damage than for the modulus. 10, the fatigue life of the traffic load for the Pa 80K N-700k 5x106 1200k N-1000k Pa, and the fatigue life of traffic load only 0.2x106 times. The fatigue life was reduced by 87%, which clearly reflects the potential damage to improve traffic load simulation of 3 flexible pavement structure based on BISAR, found that pavement damage often occurs in the automobile tire area. These failure is due to the normal load or overload load caused by excessive vertical stress caused. However, we noticed that even without the influence of traffic load and road Surface structures are also degraded by environmental factors such as rainfall, significant temperature changes and uplift of the groundwater level.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2

【参考文献】

中国期刊全文数据库 前1条

1 吴杰;石琴;;基于DEA方法的多指标评价[J];系统工程与电子技术;2006年10期

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