Geomechanics and Engineering

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The characteristics of subgrade mud pumping under various water level conditions

  • Ding, Yu (Geotechnical Engineering, School of Civil Engineering, Central South University) ;
  • Jia, Yu (Geotechnical Engineering, School of Civil Engineering, Central South University) ;
  • Wang, Xuan (Geotechnical Engineering, School of Civil Engineering, Central South University) ;
  • Zhang, Jiasheng (Geotechnical Engineering, School of Civil Engineering, Central South University) ;
  • Luo, Hao (Geotechnical Engineering, School of Civil Engineering, Central South University) ;
  • Zhang, Yu (Geotechnical Engineering, School of Civil Engineering, Central South University) ;
  • Chen, Xiaobin (Geotechnical Engineering, School of Civil Engineering, Central South University)
  • Received : 2021.01.04
  • Accepted : 2022.06.26
  • Published : 2022.07.25
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Abstract

This paper presents a study regarding the influence of various water levels on the characteristics of subgrade mud pumping through a self-developed test instrument. The characteristics of mud pumping are primarily reflected by axial strain, excess pore water pressure, and fine particle migration. The results show that the axial strain increases nonlinearly with an increase in cycles number; however, the increasing rate gradually decreases, thus, an empirical model for calculating the axial strain of the samples is presented. The excess pore water pressure increases rapidly first and then decreases slowly with an increase in cycles number. Furthermore, the dynamic stress within the soil first rapidly decreases and then eventually slows. The results indicate that the axial strain, excess pore water pressure, and the height and weight of the migrated fine particles decrease significantly with a low water level. In this study, when the water level is 50 mm lower than the subgrade soil surface, the issue of subgrade mud pumping no longer exist.

Keywords

Acknowledgement

This study was supported by the National Natural Science Foundation of China (51978674). The laboratory tests were performed in the National Engineering Research Center of High-Speed Railway Construction Technology with significant support from Dr. Zhang of Central South University. The author is grateful to the anonymous reviewers for their constructive comments and suggestions. The authors thank AiMi Academic Services (www.aimieditor.com) for the English language editing and review services.

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