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| Blasting Control Technology for Shallow Large Span Tunnel Under － passing Buildings and Monitoring Analysis of Blasting |
| ZHANG Jun－bing1，ZHENG Bao－cai1，YU Hai－tao2，KANG Kai2 |
| 1.China Railway No 3 Engineering Group Co．Ltd，Taiyuan，Shanxi 030001，China; 2.The 4th Affiliated Company，China Railway No 3 Engineering Group Co．Ltd，Beijing 102300，China |
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Abstract Research purposes:The blasting vibration velocity was monitored and the monitoring data was analyzed for blasting the tunnel of the connecting line of the Kiaochow Bay Undersea Tunnel under － passing the building group in order to ensure the structure safety of the building group on the ground，and summary was also made on the blasting control technology for providing the preference to the similar projects．
Research conclusions:The practice of construction showed the blasting control technology of advanced small pilot tunnel and sequential excavation used for the construction of shallow large span tunnel under － passing the building group was feasible to protect the safety of building group on the ground． The blasting monitored data showed that the largest blasting vibration velocity and main vibration frequency were in the allowable range， and the blasting parameters were reasonable． Application of the triple composite cutting method could improve the blasting efficiency，control the maximum charge per interval，reduce the blasting vibration velocity and benefit the protection of the buildings on the ground．
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Received: 28 January 2011
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2011, Vol. 28 
