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RISS 인기검색어
- 검색키워드
- 저자 : Jianlong Zheng (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Model for Predicting Resilient Modulus of Unsaturated Subgrade Soils in South China
Yongsheng Yao,Jianlong Zheng,Junhui Zhang,Junhui Peng,Jue Li 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.6
Subgrade soils are often unsaturated and the resilient modulus (MR) of subgrade soils is usually subjected to the climate environment andtraffic loading in the field. Therefore, the Matric Suction (MS) and traffic loading are considered to be two important parametersassociated to the MR prediction model. To verify the MR prediction model, the MS of the typical subgrade soil were determined throughthe pressure plate test. In this study, the soil-water characteristic curves were also described using the Fredlund & Xing’s model. Then,the dynamic MR of the typical subgrade soil under various stresses and water contents was measured. After that, a new prediction modelwas proposed with the model variables including the minimum bulk stress, octahedral sheer stress and matric suction, and the validity ofthe new model was verified by previous research results. Finally, the correlations between the physical properties of subgrade soilsincluding the percentage passing through the No. 200 sieve (0.075 mm), plasticity index, liquid limit, dry density and the regressioncoefficients of the new model were established. The results show that the new model can be used to predict the MR well, and it effectivelysolves the problem that the bulk stress is equal with a different combinations of the confining pressure and deviator stress. At the sametime, the MR can be predicted much more easily with physical parameters of subgrade soils rather than conducting triaxial tests.
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Viscoelastic Fatigue Damage Properties of Asphalt Mixture with Different Aging Degrees
Songtao Lv,Chaochao Liu,Jianlong Zheng,Zhanping You,Lingyun You 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.6
In order to reveal the effects of aging on fatigue damage evolution pattern of asphalt mixture, and to reveal the fatigue damagepatterns of asphalt pavement during its service life more accurately, the viscoelastic fatigue damage model for the aged asphaltmixtures was proposed based on the Burgers viscoelastic model. The dissipation energy was taken as the damage variable, and thedirect tension fatigue tests for asphalt mixture in five different aging degrees were conducted. The viscoelastic parameters of the agedasphalt mixtures were obtained.The calculationmethod of the cumulative fatigue damage was proposed, which considers the agingeffects. Moreover, the critical fatigue damage degree and fatigue life calculation equations were derived by employing the fatiguedamage model, which were calculated and compared. The calculation errors range from 3% to 18%, which was within an acceptableerror range of 30%. The research results show that the aging has a prominent impact on fatigue properties of asphalt mixtures, whichcould be illustrated by the change of the parameters of the viscoelastic fatigue damage model for the aged asphalt mixtures. Theprediction precision of fatigue life is acceptable for using the proposed viscoelastic fatigue damage model.
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