Effects of freeze-thaw cycles on sandstone in sunny and shady slopes

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外文摘要：A growing rock engineering activity in cold regions is facing the threat of freeze-thaw(FT)weathering,especially in high mountains where the sunny-shady slope effects strongly control the difference in weathering behavior of rocks.In this paper,an investigation of the degradation of petrophysical char-acteristics of sandstone specimens subjected to FT cycle tests to simulate the sunny-shady slope effects is presented.To this aim,non-destructive and repeatable testing techniques including weight,ultrasonic waves,and nuclear magnetic resonance methods on standard specimens were performed.For the sunny slope specimens,accompanied by the enlargement of small pores,100 FT cycles caused a significant decrease in P-wave velocity with an average of 23％,but a consistent rise of 0.18％in mass loss,34％in porosity,67％in pore geometrical mean radius,and a remarkable 14.5-fold increase in permeability.However,slight changes with some abnormal trends in physical parameters of the shady slope speci-mens were observed during FT cycling,which can be attributed to superficial granular disaggregation and pore throat obstruction.Thermal shocks enhance rock weathering on sunny slopes during FT cycles,while FT weathering on shady slopes is restricted to the small pores and the superficial cover.These two factors are primarily responsible for the differences in FT weathering intensity between sunny and shady slopes.The conclusions derived from the interpretation of the experimental results may provide theo-retical guidance for the design of slope-failure prevention measures and the selection of transportation routes in cold mountainous regions.

外文关键词：

Sunny-shady slopeFreeze and thawPore structureTight rocksTalus slopeCold regions

作者：

Dian Xiao、Xiaoyan Zhao、Corrado Fidelibus、Roberto Tomás、Qiu Lu、Hongwei Liu

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作者单位：

China Academy of Railway Sciences Corporation Limited,Beijing,China

Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu,China

Department of Civil Engineering,University of Alicante,Alicante,Spain

Department of Innovation Engineering,University of Salento,Lecce,Italy

Department of Earth and Environmental Sciences,University of Milano Bicocca,Milan,Italy

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基金：

National Natural Science Foundation of ChinaMajor Systematic Project of Scientific and Technological Research and Development Plan of China Railway CorporationPhD fellowship from the China Scholarship CouncilConselleria de Innovación,Universidades,Ciencia y Sociedad Digital de la Generalitat Valenciana

项目编号：

41672295P2018G047CI AI CO/2021/335

出版年：

2024

DOI：

10.1016/j.jrmge.2023.12.023

岩石力学与岩土工程学报(英文版)

中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD

影响因子：0.404

ISSN：1674-7755

年,卷(期)：2024.16(7)