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路面结构所承受的车轮反复荷载的强度和频率是影响路面使用寿命的主要因素之一。现今大多数货车发动机都能够运载超过法定最高载重量的载荷,货车业主和经营者也都倾向于车辆超载运营,以期在单位投资和人力成本下能够获得更多利润。为保证货车在大载重量的同时能够将轴载控制在合法范围内,现已设计出多轴货车,包括后双轴货车。本文就超载货车对印度卡纳塔克邦州州公路网(约4000公里)主要干道路面性能/寿命的影响展开研究。该研究通过轴载调查数据,针对两种不同情形计算车辆损害系数(VDF)。一是根据实地轴载数据大小分布情况;二是将超载单轴转化为双轴/等效标准轴。计算结果通过衰变模型和性能标准对路面性能/寿命进行预测分析,从而评估路面养护管理的益处。研究显示,货车的超载率非常高(主要是后轴超载),因此导致路面损害范围扩大,降低路面的使用寿命。从分析结果可以看出,双轴或者等效标准轴货车能减少路面超载,降低对路面损害程度。本文根据研究结果绘制了路面寿命/标准轴重复荷载的图表,以确定控制超载的益处。
Pavement structure to withstand the repeated load of the wheel intensity and frequency of the pavement life is one of the major factors. Most truck engines today carry loads in excess of the statutory maximum load, and truck owners and operators also tend to over-run their vehicles with a view to making more profits at unit costs and labor costs. Multi-axle trucks, including rear two-axle trucks, have been devised to ensure that the truck will be able to control the axle load within its legal limits at high loads. This article studies the effect of an overloaded truck on the pavement performance / longevity of the main trunk road network in the State of Karnataka, India (about 4,000 km). The study calculates vehicle damage factor (VDF) for two different scenarios using on-board survey data. First, according to the size of the field distribution of on-board data; the second is to transform single-axis overload / biaxial / equivalent standard axis. Calculation Results Pavement performance / life prediction was analyzed using decay models and performance criteria to assess the benefits of pavement maintenance management. Research shows that the overloading rate of the truck is very high (mainly the rear axle is overloaded), which leads to the widening of the damage range of the road surface and the reduction of the service life of the road surface. From the analysis results, it can be seen that biaxial or equivalent standard axle trucks can reduce the road surface overload and reduce the damage to the road surface. Based on the results of the study, the paper plots pavement lifetimes / standard shaft repetitive loads to determine the benefits of controlling overloading.