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  Results of in situ pressure measurements during pre-excavation grouting in rock tunnels

  Grouting of the rock mass around tunnels is performed to reduce water inflow. Pressure and flow-rate of the grout is recorded on the rig during grouting, but there is little documentation of the pressure of groundwater and grout in situ in the drill hole and neighbouring holes before, during and after the grouting. Instrumentation was developed to record pressure at the back of the packers inside the drill holes during pre-excavation grouting. Using this equipment, measurements inside multiple drill holes have been made over several rounds of grouting in tunnels. The data has been analysed to gain an understanding of the behaviour of the grouting process in the rock mass. Episodes of jacking of fractures have been identified and the data used to see if the in situ stress can be determined. The connectivity between drill holes, shown by pressure measurements during grouting in nearby drill holes, has been documented.

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