首页|Microstructure and water-swelling mechanism of red-bed mudstone in the Xining region,Northeastern Tibetan Plateau

Microstructure and water-swelling mechanism of red-bed mudstone in the Xining region,Northeastern Tibetan Plateau

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This paper examines the effect of the microstructure and electrical conductivity(EC)on the swelling ratio and pressure in red-bed mudstone sampled from arid areas in the Xining region in the northeastern Tibetan Plateau.A series of laboratory tests,including swelling experiments,X-ray diffraction(XRD),and scanning electron microscope(SEM),was carried out for mechanical and microstructural analysis.The coupled influence of the EC and microstructural parameters on the expansion ratio and pressure was investigated,and the weight coefficients were discussed by the entropy weight method.The results revealed an increasing exponential trend in EC,and the maximum swelling speed occurred at an EC of approximately 10 μS/cm.In addition,a method for predicting the expansion potential is proposed based on the microstructure,and its reliability is verified by comparing with swelling experimental results.In addition,according to the image analysis results,the ranges of the change in the clay minerals content(CMC),the fractal dimension(FD),the average diameter(AD)of pores,and the plane porosity(PP)are 23.75％-53％,1.08-1.17,7.53-22.45 μm,and 0.62％-1.25％,respectively.Moreover,mudstone swelling is negatively correlated with the plane porosity,fractal dimension and average diameter and is linearly correlated with the clay mineral content.Furthermore,the weight values prove that the microstructural characteristics,including FD,AD,and PP,are the main factors influencing the expansion properties of red-bed mudstones in the Xining region.Based on the combination of macro and micro-analyses,a quantitative analysis of the swelling process of mudstones can provide a better reference for under-standing the mechanism of expansion behavior.

MudstonesMicrostructureSwelling characteristicsElectrical conductivity(EC)Scanning electron microscopeWater-swelling

Huan Guan、Yong Ren、Sixiang Ling、Xiyong Wu、Tao Yu、Xian Li、Sen Wang、Chunwei Sun

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School of Civil Engineering,Southwest Jiaotong University,Chengdu,610031,China

Faculty of Geosciences and Engineering,Southwest Jiaotong University,Chengdu,611756,China

Moe Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu,610031,China

Guangzhou Metro Design and Research Institute Co Ltd.,Guangzhou,510010,China

Chengdu City Construction Investment Group Co Ltd.,Chengdu,610036,China

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National Natural Science Foundation of ChinaSichuan Science and Technology Program,ChinaChengdu Science and Technology Program

420772712023YFS03642022-YF05-00340-SN

2024

10.1016/j.jrmge.2023.11.031

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)