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Abstract Application experiences of open-type hard rock tunnel boring machine(TBM) to diversion tunnel group of Jinping II hydropower station are summarized. Firstly，in order to determine the suitable equipment structure and boring parameters，selection of facilities and optimization of boring parameters for open-type hard rock TBM of Jinping II hydropower station under high geostresses are studied. Advanced geological prediction in front of tunnel face is carried out by adopting combined means such as BEAM，TSP and geology radar；and good prediction results are achieved；so that corresponding preparing handling measures can be established. Furthermore，the prediction and pre-warning measures of rockburst under high geostresses are investigated by firstly importing microseism monitoring system to the hydropower project in China；and the relative accurately occurrence range of rockburst have been predicted. The investigation has developed a series of experimental works on the supporting measures to prevent rockburst，which have effectively lowered the risk and harm of rockburst. Finally，a comprehensive research on how to realize safe and fast construction of TBM are also carried out，so as to provide references and suggestions to the facility selection and applications of open-type TBM in future.
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Received: 05 February 2012
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2012, Vol. 31 
