Geomechanics and Engineering

  • 제36권1호
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  • Pages.9-18
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  • 2024
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Disintegration process and micro mechanism of mudstone under dry-wet cycles

  • Ji Chen (School of Rail Transportation, Soochow University) ;
  • Ruyu Huang (Human Resources and Social Security Bureau) ;
  • Xinyu Luo (School of Rail Transportation, Soochow University) ;
  • Xin Liao (Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University) ;
  • Qiang Tang (School of Rail Transportation, Soochow University)
  • 투고 : 2022.01.24
  • 심사 : 2023.11.28
  • 발행 : 2024.01.10
⟨ 이전 논문 다음 논문 ⟩

초록

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 ㎛2 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.

키워드

과제정보

We would like to thank Analytical and Testing Center of Southwest Jiaotong University. The research presented here is supported by the National Key Research and Development Program of China (2023YFC3707801), National Natural Science Foundation of China (52078317), Natural Science Foundation of Jiangsu Province for Excellent Young Scholars (BK20211597), project from Bureau of Housing and Urban-Rural Development of Suzhou (2021-25; 2021ZD02; 2021ZD30; 2023ZD26), Bureau of Geology and Mineral Exploration of Jiangsu (2021KY06), China Tiesiju Civil Engineering Group (2021-19), and CCCC Tunnel Engineering Company Limited (8gs-2021-04)..

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