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Predicting the International Roughness Index of jpcp and CRCP Rigid Pavement:A Random Forest(RF)Model Hybridized with Modified Beetle Antennae Search(MBAS)for Higher Accuracy

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1557-1582页

作者： Zhou Ji Mengmeng Zhou Qiang Wang Jiandong Huang College of Civil and Environmental Engineering Hunan University of Science and EngineeringYongzhou425006China School of Mines China University of Mining and TechnologyXuzhou221116China School of Civil Engineering Guangzhou UniversityGuangzhou510006China

To improve the prediction accuracy of the International Roughness Index(IRI)of Jointed PlainConcrete Pavements(jpcp)and Continuously Reinforced Concrete Pavements(CRCP),a machine learning approach is developed in this study for the modelling,combining an improved Beetle Antennae Search(MBAS)algorithm and Random Forest(RF)*** 10-fold cross-validation was applied to verify the reliability and accuracy of the model proposed in this *** importance scores of all input variables on the IRI of jpcp and CRCP were analysed as *** results by the comparative analysis showed the prediction accuracy of the IRI of the newly developed MBAS and RF hybrid machine learning model(RF-MBAS)in this study is higher,indicated by the RMSE and R values of 0.2732 and 0.9476 for the jpcp as well as the RMSE and R values of 0.1863 and 0.9182 for the *** accuracy of this obtained result far exceeds that of the IRI prediction model used in the traditional Mechanistic-Empirical Pavement Design Guide(MEPDG),indicating the great potential of this developed *** importance analysis showed that the IRI of jpcp and CRCP was proportional to the corresponding input variables in this study,including the total joint faulting cumulated per KM(TFAULT),percent subgrade material passing the 0.075-mm Sieve(P_(200))and pavement surface area with flexible and rigid patching(all Severities)(PATCH)which scored higher.

关键词： Cement pavement jpcp CRCP RF-MBAS IRI

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EVALUATION OF EARLY-AGE JOINT MOVEMENTS OF jpcp AT FIELD

EVALUATION OF EARLY-AGE JOINT MOVEMENTS OF JPCP AT FIELD

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4～(th) International Conference on Road & Airfield Pavement Technology

作者： Kyong-Ku Yun Doug-Ho Kim Do-Wan Kim Ji-Won Kim Seung-Woo Lee Assistant Professor Civil Engineering Department of Kangwon National University in Korea Doctoral Candidate Civil Engineering Department of Kangwon National University in Korea Researcher Highway Research Center of Korea Highway Corporation in Korea Chief Researcher Highway Research Center of Korea Highway Corporation in Korea Deputy Manager Civil Engineering Technology 1 Team of Dae Woo E＆C in Korea

＜正＞ Concrete pavement receives restrained stresses from early curing and which is restricted or is extended by external circumstance such as gradient of temperature and moisture. These behavior of jpcp（Jointed Plain Concrete Pavement） increase its binding power and tend to induce failure of joints, nd which consider the mainly influence of early-age joint opening of concrete slab. In this research, the early-age joint movements and behavior of dowel-bar at jpcp were studied through field tests. The field tests were carried out for 5 days just after concrete placement, for 1 day after 52 and 1 day after 72 days on Chung-Ang Expressway new construction site in Dan-yang on the 28th and 29th of May 2001. The joint movements and dowel-bar behavior were measured by demec gauge, clip gauge, and strain gauge. The results could be summarized as follows;The tensile and compressive behavior of dowel bars for the first 3 days increased rapidly in early-age, and then decreased gradually after the first 3 days period. It was, also, found that dowel-bars behaved under the influence of temperature and moisture to which they were exposed. The jointmovement variation with temperature changes as discovered in this research presented fairly good conformity with the prediction from Darter’s formula. The results of regression analysis for the data measured during early 5 days showed that the joints of No.4, No.5, No.6, No. 10, No. 13, and No. 15 could be considered as a moving joint. From data analysis on July 20, the joints of No.2, No.9, and No. 10 showed the significant correlations from the minus value of coefficient of regression, which usually present lower C-values. As a result of regression data on August 8, joint movements occurred at all joints. Joint freezing and closure could be judged from the regression analysis using joint opening and total temperature measured at field tests.

关键词： jpcp early age joint movement field test dowel bar

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基层类型对设接缝普通混凝土路面性能的影响

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中外公路 2009年第3期29卷 82-86页

作者：郑木莲余四新邱自萍长安大学特殊地区公路工程教育部重点实验室陕西西安710064

该文首先对基层类型对设接缝普通水泥混凝土路面(jpcp)性能的影响进行了简要介绍,然后通过路面长期性能(LTPP)计划和美国联邦公路局(FHWA)刚性路面性能与修复(RPPR)两项研究在美国进行的大量现场试验研究的数据分析,评价了刚性路面各设... 详细信息

该文首先对基层类型对设接缝普通水泥混凝土路面(jpcp)性能的影响进行了简要介绍,然后通过路面长期性能(LTPP)计划和美国联邦公路局(FHWA)刚性路面性能与修复(RPPR)两项研究在美国进行的大量现场试验研究的数据分析,评价了刚性路面各设计要素、气候、路基和交通对jpcp性能的影响。

关键词：基层类型 jpcp 现场试验设计要素反算

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