隔振带在浅埋隧道爆破中的作用

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Abstract Research purposes:The measures and technologies of reducing the explosive charge for simultaneous blasting，building the vibration isolation belt and reducing vibration by interference are often taken and used when there is sensitive building above shallow tunnel，but at present，there is a little quantitative evaluation of the effect of the vibration isolation belt in China． In this paper，the influence of blasting vibration on the surface is analysised when the blasting is conducted for excavation of small pilot tunnel in the 27m buried depth area of the tunnel，and vibration isolation belt is built around the top cross section of the tunnel．

Research conclusions:From the analyse of the characteristic values of the elastic boundary，it is seen the fundamental vibration mode period of the model is 0.203 603 s．From analysis of the dynamic time － history of the elastic － plastic boundary，the velocity and acceletation before and after the building the vibration isolation belt are seen． The research result shows that the vertical vibration velocity is reduced by 39 percent in average，and the vertical acceleration is reduced by 38 percent in average when the vibration isolation belt isbuilt．

Key words： vibration isolation belt of tunnel blasting load formula slip of vibration velocity boundary

Received: 04 May 2012

PACS:	U25
	U215.3

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	Articles by authors
	WANG Shu－qiang
	CHEN Chi－kun

Cite this article:

WANG Shu－qiang,CHEN Chi－kun. The Effect of Vibration Isolation Belt on Shallow Tunnel Blasting[J]. 铁道工程学报, 2012, 29(8): 66-70.

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I8/66

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