Influence of Design Parameters of Grout Injection in Rock Mass using Numerical Analysis

암반 그라우팅 주입 설계변수가 주입성능에 미치는 영향의 수치해석적 평가

  • 이종원 (한국지질자원연구원) ;
  • 김형목 ;
  • ;
  • 박의섭 (한국지질자원연구원 전략기술연구본부 심지층연구단)
  • Received : 2017.10.13
  • Accepted : 2017.10.19
  • Published : 2017.10.31


In this paper, a numerical analysis of one-dimensional viscous fluid flow in a rock joint using UDEC code is performed to evaluate the effect of design parameters on injection performance. We consider injection pressure, fluid compressibility, time dependence of yield strength and viscosity of injected grout fluid, and mechanical deformation of joint as the design parameters, and penetration length and flow rate of injection are investigated as the injection performance. Numerical estimations of penetration length and flow rate were compared to analytical solution and were well comparable with each other. We showed that cumulative injection volume can be over-estimated by 1.2 times than the case that the time-dependent viscosity evolution is not considered. We also carried out a coupled fluid flow and mechanical deformation analysis and demonstrated that injection-induced joint opening may result in the increment of cumulative volume by 4.4 times of that from the flow only analysis in which joint aperture is kept constant.


Viscous fluid flow;Grouting;UDEC;Injection performance;Penetration length;Injection rate


Grant : 시추공 기반 심지층 특성규명 InDEPTH 요소기술 개발

Supported by : 한국지질자원연구원, 한국연구재단


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