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| Research on the Control Technology for Tunnel Blasting Vibration |
| YANG Nian-hua, ZHANG Zhi-yi |
| China Academy of Railway Sciences, Beijing 100081, China |
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Abstract Research purposes：The blasting vibration is very sensitive in construction of the shallow burying tunnel under complicated environment with bore blasting method. The blasting technology that can realize rapid boring and reduce the blasting vibration in the sensitive area is really needed in the tunnel construction.
Research conclusions：From the tests and analyses of the blasting vibration in construction of 25m buried deep Kaiyuansi Tunnel and the diversion tunnel in Hangzhou with bore blasting method, it is found the ground vibration caused by undermine blasting is the most serious. The experiment shows application of multi-stage wedge undermine can reduce the blasting vibration effectively, and application of high-precise delay blasting cap or digital electric blasting cap to adjust the time difference of the undermine blasting can reduce the vibration of vibration wave by alternating peak, improve the undermine effect and utilization rate of the hole. Based on the monitoring the blasting vibration during the blasting experiment, the undermine blasting plan is continuously improved and optimized to achieve the goal of passing through the shallow buried sensitive area of the tunnel with about 3m boring of each blasting and the ground blasting vibration of 1.5-2.5 cm/s. In this case, the rapid construction with bore blasting method is realized.
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Received: 09 November 2009
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2010, Vol. 27 
