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Abstract Taking the project of Huolangyu tunnel in Mixing road as the background，the experiments for tunnel blasting excavation and ground vibration test are carried out. Based on the measurement of the waveforms of the vibration velocity in different distances away from the tunnel blasting sources on the ground，the vibration characteristic of the ground and its varying laws are studied. The results of the monitoring and analysis show that：(1) Along the tunnel excavation direction，the vibration velocity shows attenuation trend from the excavated zone to non-excavated. And the various law of shallow tunnel excavation blasting vibration is closely related with the cross-section size，depth，construction techniques and geological conditions，and so on. (2) The vibration control of wedge cutting holes blasting is the key of reducing or eliminating shallow tunnel vibrating calamity. And the choice of the multi-stage small wedge cutting holes instead of the big wedge cutting holes can noticeably ameliorate blasting vibration and rock fragmentation. (3) Comprehensive monitoring of the blasting vibration and optimizing blasting parameter can improve the blasting vibration harm and construction efficiency and reduce the consumption of materials and supplies at the same time.
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Received: 20 May 2011
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2011, Vol. 30 
