Similar to the Seattle project, this one required new drilling techniques, including the use of probe holes to assess ground conditions ahead of the huge tunnel-boring machines (TBM).
与西雅图的工程相似的是，这里的项目也需要新的钻探技术，包括在上马巨型隧道掘进机(TBM)前使用探孔来评估土质条件。
Similar to the Seattle project, this one required new drilling techniques, including the use of probe holes to assess ground conditions ahead of the huge tunnel-boring machines (TBM).
与西雅图的工程相似的是，这里的项目也需要新的钻探技术，包括在上马巨型隧道掘进机(TBM)前使用探孔来评估土质条件。
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