Study on Service Life Evaluation Indexes Based on Road Structure Bearing Capacity and Environmental Severity
With the large-scale maintenance period of Chinese roads,the service time of a large number of roads has entered the late stage of design life,but the existing maintenance system still lacks the standards of highway life extension,and the current life evaluation index is mainly for newly built roads.Taking into account the deterioration of road conditions due to environmental factors and load during service,a long-life evaluation method is proposed.This method combines the pavement s intrinsic health condition with external service environment factors,along with corresponding index thresholds linked to life expectancy.A road health index(HPHi)was constructed to characterize the structural health level of the road using principal component analysis(PCA)The Deflection Basin Parameters(DBP)were used to include:the Surface Curvature Index(SCI),the Base Damage Index(BDI),the Base Curvature Index(BCI),and the Condition Index(CI).Based on the natural zoning of China's highways for wet coefficient(K),standard freezing depth(H0),and freezing index(F)characterization of the natural environment,combined with the traffic load level,the jointly constructed environmental harsh index(EEHI)describes the severity of the external service environment of the road.Based on HPHI and EEHI,the road health deterioration rate(RHDR)was constructed as an evaluation index for the long life of roads in service.Preliminary research results show that HPHI and RHDR can jointly determine the life stage in the three-stage life theory.In the second life stage,RHDR less than 0.2 is the long-life threshold for a road life of 30 years,less than 0.7 is the standard threshold for a road life of 15 years,and when the RHDR increases suddenly and continuously,it characterizes the road life into the third stage as the warning threshold.In the theoretical domain,the proposed long-life evaluation index translates the abstract concept of road lifespan into a concrete and practical index.It converts the three-stage road theory into an actionable index,enabling long-term monitoring and accurate lifespan prediction of road conditions,thereby offering a robust theoretical foundation for analyzing the longevity of roads in service.
pavement engineeringlong-life time pavementlong life evaluation indicatorpave-ment health indexenvironmental harsh indexhealth degradation rate
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