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  Multi-hole grouting, field tests to increase the efficiency of the grouting production process

  Time is a critical factor for tunnel construction and if grouting is required the time efficiency of the grouting procedure is essential for the overall cost of the tunnel construction. In this paper initial field tests of multi-hole grouting are reported and the possible time saving actions described. The test shows that the handling time of the equipment can be reduced resulting in the potential to save 26% of the total grouting time. In a rock mass with a high hydraulic conductivity multi-hole grouting will not only produce a better result with regards to grout production efficiency, but also a better sealing effect by reducing the risk for connected holes and helping to ensure that the design grout pressure is maintained.

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