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Sökning: WFRF:(Stille Håkan)

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  • Holmberg, M., et al. (författare)
  • Evaluation of pre-grouting for the city line project using the RTGC method
  • 2012
  • Ingår i: ISRM International Symposium - EUROCK 2012. - : International Society for Rock Mechanics.
  • Konferensbidrag (refereegranskat)abstract
    • An access tunnel for the City Line project in Stockholm was excavated in the early parts of 2010. The works also included pre-grouting with cement. The performance of pre-grouting operation was evaluated for 14 continuous fans that included 326 grouted holes. A method called “Real Time Grouting Control (RTGC)”was used in the analysis. It is shown how the RTGC method can be used to investigate the effectiveness of existing stop criteria. It is first time an evaluation using RTGC carried out in this magnitude. The water inflow to the tunnel after grouting satisfied requirements. The grouting effect is quantified by assessments of the average conductivity of the rock mass and of the grout spread outside the tunnel. The evaluation indicates that the stop criteria in the design were chosen conservatively relative to the achieved grouting results. A model is discussed where the required grout spread is used as a design parameter to quantify the potential for reducing the pumping time.
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  • Stille, Björn, 1969, et al. (författare)
  • Experience with the real time grouting control method
  • 2009
  • Ingår i: Geomechanics and Tunneling. - : Wiley. - 1865-7362 .- 1865-7389. ; 2:5, s. 447-459
  • Tidskriftsartikel (refereegranskat)abstract
    • A new concept of "real time grouting control method" is described by which grout penetration and grouting control are made applicable in real time by applying theories for grout spread. The stop criterion with this method can be related to achieved grout spread, and grouting may be considered complete when the grout penetration for the smallest fracture to be sealed is above a predetermined target value, or before the grout penetration for the largest fracture aperture reaches a certain maximum limiting value. It might also be possible by online monitoring of the process to predict the course of the grout spread and flow and to analyse the risk of uplift and jacking. Four tunnel projects in Sweden are presented in the paper. These references indicate that the real time grouting control method may be applicable to real grouting design and control.
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  • Stille, Björn, 1969, et al. (författare)
  • Experiences With Real Time Grouting Control Method
  • 2010
  • Ingår i: Bergmekanikdag : föredrag vid Bergmekanikdag i Stockholm 8 mars 2010.. - 0281-4714. ; , s. 119-132
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • In the paper the concept of “Real Time Grouting Control Method” is described in order to calculate the grout penetration and to control grouting in real time by applying developed theories for grout spread. The stop criterion can with this method be related to achieved groutspread such as the fact that grouting is completed when the grout penetration for the smallest fracture that has to be sealed is above a certain minimum value (target value) or before the grout penetration for the largest fracture aperture reaches a certain maximum value (limitingvalue).It might also be possible by following the ongoing grouting minute by minute to predict the course of the grout flow and spread and also analyze the risk for uplift and jacking. These issues will also be discussed in the paper.Verification of the “Real Time Grouting Control Method”, with field data from four tunnel projects in Sweden is presented in the paper. The calculated flow dimensionality, the calculated fracture apertures and the calculated grout flows were quite close to thosemeasured. This indicates that the “Real Time Grouting Control Method” may be applicable to real grouting design and control.
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