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Geomechanics and Engineering
  Volume 36, Number 1, January10 2024 , pages 9-18
DOI: https://doi.org/10.12989/gae.2024.36.1.009
 


Disintegration process and micro mechanism of mudstone under dry-wet cycles
Ji Chen, Ruyu Huang, Xinyu Luo, Xin Liao and Qiang Tang

 
Abstract
    With the rapid development of highways and railways, series of traffic safety issues emerged because of mudstone disintegration. To research on the mechanism and further guarantee the stability and safety of transportation infrastructure built on or near mudstone formations, the mudstone disintegration test of mudstone was carried out based on mudstone and sandy mudstone. The element types, cementation characteristics and pore characteristics of the tested specimens were studied by means of Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Image Pro Plus (IPP). The disintegration index of mudstone was approximately 1%, and even some specimens were difficult to be calculated, while the disintegration index of sandy mudstone is approximately 8.7%. According to the results, the two mudstones belong to grade II and III disintegration respectively, of which the sandy stone presents more extensive disintegration than mudstone. This phenomenon was distinguished that, the clay minerals of mudstone are approximately 25% more abundant than those of sandy mudstone, and the unit pore area is 20 um2 larger, which result in different microstructure and water absorption capacities. In the liquid phase, the ions in the mudstone specimens were exchanged and combined with water molecules in the environment during the whole disintegration process. This results in continuous spalling and fragmentation of clay minerals, the emergence of secondary fractures, and the deepening of primary fractures.
 
Key Words
    disintegration test; dry-wet cycle; microstructure; mineral composition; mudstone
 
Address
Ji Chen and Qiang Tang: School of Rail Transportation, Soochow University, Suzhou, 215131, China;
Graduate School of Global Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan;
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
Xinyu Luo: School of Rail Transportation, Soochow University, Suzhou, 215131, China
Xin Liao: Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
Ruyu Huang: Human Resources and Social Security Bureau, Tonggu County, 336299, China

 

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