Geomechanics and Engineering

  • 제31권1호
  • /
  • Pages.87-97
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Plastic deformation characteristics of disintegrated carbonaceous mudstone under dynamic loading

  • Qiu, Xiang (Department of Civil Engineering, Changsha University of Science & Technology) ;
  • Yin, Yixiang (Department of Civil Engineering, Changsha University of Science & Technology) ;
  • Jiang, Huangbin (Department of Traffic & Transportation Engineering, Changsha University of Science & Technology) ;
  • Fu, Sini (Department of Civil Engineering, Changsha University of Science & Technology) ;
  • Li, Jinhong (Department of Civil Engineering, Changsha University of Science & Technology)
  • 투고 : 2021.06.16
  • 심사 : 2022.09.18
  • 발행 : 2022.10.10
⟨ 이전 논문 다음 논문 ⟩

초록

The excessive settlement and deformation of disintegrated carbonaceous mudstone (DCM) embankments under dynamic loading have long been problems for engineers and technicians. In this work, the characteristics and mechanism of the plastic deformation of DCM under different degrees of compaction, water contents and confining pressures were studied by static triaxial, dynamic triaxial and scanning electron microscopy testing. The research results show that the axial stress increases with increasing confining pressure and degree of compaction and decreases with increasing water content when DCM failure. The axial strain at failure of the DCM decreases with increasing confining pressure and degree of compaction and increases with increasing water content. Under cyclic dynamic stress, the change in the axial stress level of the DCM can be divided into four stages: the stable stage, transition stage, safety reserve stage and unstable stage, respectively. The effects of compaction, water content and confining pressure on the critical axial stress level which means shakedown of the DCM are similar. However, an increase in confining pressure reduces the effects of compaction and water content on the critical axial stress level. The main deformation of DCM is fatigue cracking. Based on the allowable critical axial stress, a method for embankment deformation control was proposed. This method can determine the degree of compaction and fill range of the embankment fill material according to the equilibrium moisture content of the DCM embankment.

키워드

과제정보

The research described in this paper was financially supported by the National Natural Science Foundation of China (Nos. 52278439, 51908073, 51838001 and 52078066), and the Natural Science Foundation Project of Hunan Provincial Department of Education (21B0317).

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