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The hazard of overloading the asphalt pavement

Author: HuZuo
Tutor: DaiJingLiang
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Overload transportation Control Measures Asphalt Pavement Overload factor Axle load conversion Fatigue properties
CLC: U418.6
Type: Master's thesis
Year: 2005
Downloads: 316
Quote: 5
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Abstract


Overload traffic problems , although it has attracted extensive attention , but in terms of the asphalt pavement , overloaded vehicles its in the end how much damage and fatigue life in the end be able to reduce how much the problem is not a quantitative answer . To this end , the project for the current traffic conditions , analysis of the use of the limit vehicles under asphalt pavement characteristics , and gauge the impact of the vehicle for a reasonable assessment , propose appropriate countermeasures . First, through extensive research, system overload causes and its dangers . Secondly , based on overloaded vehicles on the road within the stress is often subject to clearance time , the impact of the stress level , the effects of temperature , which is close to the limit of the asphalt concrete stress and overloaded vehicles a frequent fact , the effect of high stress ratio asphalt the mixture fatigue test results showed that the asphalt mixture fatigue performance is significantly different from the low-stress , high stress ratio is no longer in use in the case of low stress than the fatigue equation , the project by regression analysis of experimental data gives a high stress ratio under 0S, 1S fatigue equation . Finally , with 3D finite element method analysis of overloaded vehicles under Asphalt Pavement in five characteristics : under overloaded vehicles will lead to a substantial increase in stress within the pavement structure , considerable stress on the surface layer of low surface : will make the road surface deflection larger increase in axle load slightly increase to be a substantial increase in the thickness of the pavement structure ; pavement rutting will have a great impact , causing the road early damage ; would reduce pavement life , for example, under normal conditions , the life expectancy of 12 years of pavement overload ratio is 50% , the indicator on Deflection pavement life of less than 2 years, and the tensile stress and rutting indicators pavement life of less than 1 year ; may also lead to the ultimate destruction of the pavement . According to the three research operability of technical countermeasures to prevent overloaded vehicles damaging effects . The project has a strong practical significance , its research available for asphalt pavement design and Administrator's Reference .

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CLC: > Transportation > Road transport > Road works > Road maintenance and repairs > Road maintenance and repair
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