Structural Engineering and Mechanics

  • 제75권5호
  • /
  • Pages.571-583
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  • 2020
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Filtration-induced pressure evolution in permeation grouting

  • Zhou, Zilong (School of Resources and Safety Engineering, Central South University) ;
  • Zang, Haizhi (School of Resources and Safety Engineering, Central South University) ;
  • Wang, Shanyong (Faculty of Engineering and Built Environment, ARC Centre of Excellence for Geotechnical Science and Engineering, The University of Newcastle) ;
  • Cai, Xin (School of Resources and Safety Engineering, Central South University) ;
  • Du, Xueming (College of Water Conservancy and Environmental Engineering, Zhengzhou University)
  • 투고 : 2019.12.05
  • 심사 : 2020.03.15
  • 발행 : 2020.09.10
⟨ 이전 논문 다음 논문 ⟩

초록

Permeation grouting is of great significance for consolidating geo-materials without disturbing the original geo-structure. To dip into the filtration-induced pressure increment that dominates the grout penetration in permeation grouting, nonlinear filtration coefficients embedded in a convection-filtration model were proposed, in which the volume of cement particles in grout and the deposited particles of skeleton were considered. An experiment was designed to determine the filtration coefficients and verify the model. The filtration coefficients deduced from experimental data were used in simulation, and the modelling results matched well with the experimental ones. The pressure drop revealed in experiments and captured in modelling demonstrated that the surge of inflow pressure lagged behind the stoppage of flow channels. In addition, both the consideration of the particles loss in liquid grout and the number of filtrated particles on pore walls presented an ideal trend in filtration rate, in which the filtration rate first rose rapidly and then reached to a steady plateau. Finally, this observed pressure drop was extended to the grouting design which alters the water to cement (W/C) ratio so as to alleviate the filtration effect. This study offers a novel insight into the filtration behaviour and has a practical meaning to extend penetration distance.

키워드

과제정보

This work was supported by financial grants from the National Basic Research Program of China (2015CB060200), the National Natural Science Foundation of China (41772313), the Hunan Science and Technology Planning Project (2019RS3001) and the Fundamental Research Funds for the Central Universities of Central South University (2018zzts720). The authors are very grateful for the financial contributions and convey their appreciation to the organizations for supporting this basic research.

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