The Efficiency of Large Hole Boring (MSP) Method in the Reduction of Blast-Induced Vibration

Drill and blast is the most cost-effective excavation method for underground construction, however, vibration noise, induced by blasting, have been consistently reported as problems. Cut blasting has widely employed to reduce blast-induced problems during excavation. We propose that large hole boring using state-of-the-art MSP (Multi-setting smart-investigation of ground pre-large boring) machine (“MSP method”) can efficiently improve reduction. The will be used create 382 mm diameter empty holes at tunnel cut area this purpose. This study assessed efficiency in reducing five patterns a cylinder-cut, which traditional method. controlled demonstrated up 72% reduction vibration, compared base case, Pattern B, where only cylinder-cut smooth were applied. Therefore, proves promising alternative sensitive urban areas non-vibration techniques initially considered. Geological characteristics 50 m beyond face acquired through proposed real-time data monitoring system together with borehole alignment tracking exploration system. obtained geological information great help preparing designs, scheduling construction equipment labour construction.