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Impact of extreme climate and train traffic loads on the performance of high-speed railway geotechnical infrastructures

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第3期24卷 189-205页

作者： Ying WU Haoran FU Xuecheng BIAN Yunmin CHEN MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China Department of Civil Engineering Zhejiang UniversityHangzhou 310058China

High-speed railways are very important in global ***,the railway subgrade is significantly affected by the environment due to its exposure to the *** present,global warming is the primary trend in world climate change and seriously damages railway *** to the coupling effect of extreme environmental and train loads,various subgrade problems tend to arise,such as settlement,ballast fouling,and mud pumping,thus inducing frequent railway accidents and reducing travel *** into the problems triggered by extreme climate and train loads are critical to the design and long-term operation of high-speed railway *** study therefore presents a detailed survey of recent advances in typical subgrade problems through analyzing the problem formation mechanisms and *** and emerging detection/monitoring technologies in respect of subgrade problems are discussed in detail,as well as pre-accident and post-accident maintenance ***,according to the existing challenges in long-term subgrade shakedown assessment,an outlook on open opportunities is provided for future research.

关键词： High-speed railways Subgrade performance train loads Extreme climate

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Influence of principal stress rotation of unequal tensile and compressive stress amplitudes on characteristics of soft clay

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Journal of Mountain Science 2017年第2期14卷 369-381页

作者： SHEN Yang WANG Xin LIU Han-long DU Wen-han WANG Bao-guang XU Hai-dong Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education Hohai UniversityNanjing 210098China Jinan Rail Transit Group Co. LtdJinan 250100China School of Civil Engineering Chongqing UniversityChongqing 400044China

Soil behavior can reflect the characteristics of principal stress rotation under dynamic wave and traffic loads. Unequal amplitudes of tensile and compressive stresses applied to soils have complex effects on foundation soils in comparison with the pure principal stress rotation path. A series of undrained cyclic hollow torsional shear tests were performed on typical remolded soft clay from the Hexi area of Nanjing, China. The main control parameters were the tensile and compressive stress amplitude ratio(α) and the cyclic dynamic stress ratio(η). It was found that the critical η tended to remain constant at 0.13, when the value of the compressive stress amplitude was higher than the tensile stress amplitude. However, the influence of the tensile stress was limited by the dynamic stress level when α= *** obvious structural change in the soil, the corresponding numbers of cyclic vibration cycles were found to be independent of α at low stress levels and were only related to η. Finally, a new method for evaluating the failure of remolded soft clay was presented. It considers the influence of the tensile and compressive stresses which caused by complex stress paths of the principal stress rotation. This criterion can distinguish stable, critical, and destructive states based on the pore-water-pressure-strain coupling curve while also providing a range of failure strain and vibration cycles. These results provide the theoretical support for systematic studies of principal stress rotation using constitutive models.

关键词： Complex stress path Principal stress rotation train loads Amplitude ratio Cyclic dynamic stress ratio Failure criterion

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