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Prediction of Ultimate Bearing Capacity and Life-span of Asphalt Pavements

Author: ZhangWen
Tutor: HuangLiKui
School: Hunan University
Course: Road and Railway Engineering
Keywords: Asphalt Pavement Ultimate bearing capacity Service life Vehicle permit Axle combination
CLC: U416.217
Type: Master's thesis
Year: 2009
Downloads: 224
Quote: 2
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Abstract


Ensure the long-term performance of asphalt pavement, to ensure that the remaining life of the perspective, the need to assess the normal use of asphalt pavement allow assessment and control through the vehicle load; temporary passage of special vehicles, asphalt pavement damage needs assessment critical state permit through the vehicle load. Based on the above understanding, the two aspects of the asphalt pavement ultimate bearing capacity: normal axis limit and limit axle load. The key is to solve the problem of semi-rigid the layer carrying capacity of asphalt pavement structure is emphasized as a load-bearing layer of semi-rigid base asphalt surface functional layers to solve the ultimate bearing capacity of the asphalt pavement. Analysis of domestic and foreign common asphalt pavement design specifications, and to consider the characteristics of the asphalt pavement structure in China to determine the carrying capacity of the asphalt pavement control standards: the prevent structural integrity layer cracking and subgrade top surface is too large deformation. Control indicators for the integrity of the structure of the layers of the bottom tensile strain to compressive strain on top of the soil base surface deflection. The two aspects of the asphalt pavement bearing capacity and service life limit state indicators from the ultimate load and normal use. Of asphalt pavement ultimate bearing capacity calculations by further research, BZZ-100, that is based on the standard axle load calculation results infer Ultimate Axle Load and normal axis limit. Introduction of asphalt pavement residual life, the life of the meter, the cumulative life the concept of three levels typical asphalt pavement structure for the whole life process analysis. The study found that the tensile strain at the end of the layers of pavement deflection and structural integrity better able to characterize the carrying capacity of the asphalt pavement structure at different life stages; hosted by introducing limits than normal axis limits than the concept of different asphalt pavement structure in the different life stages of the carrying capacity of the bearing capacity of the road scene detection assessment results SSI (pavement structure strength coefficient) correlate; combination of the current non-destructive testing means a life stage asphalt pavement remaining life and limit axle load, normal axis limits to be assessed. Damage to the pavement structure to reduce the load transportation to grasp good models and axle combination is the root of the problem. The focus of research and installed both biaxial vehicles on different levels, the role of the different life stages of the asphalt pavement effect from the ultimate bearer and normal use of vehicles. Permission should be concerned about. Finally, analysis of the impact of the special axle combinations of asphalt pavement structure.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Asphalt Pavement
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