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《Chinese Journal of Underground Space and Engineering》 2013-01
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The Proper Driving Footage in the Jump-Driving Method for Single-Sided Tunnel Extension

Tan Yizhong1,Liu Yuanxue1,Zhou Jiawu1,Chen Xiaoliang2(1.Dept.of Architecture & Civil Engineering,LEU,Chongqing 401311,China; 2.Unit 73846 of PLA,Nanjing 211802,China)  
As the traffic volume increased,the original capacity of the tunnel has been unable to meet the needs.So it should be expanded on the basis of the original tunnel.Based on the features of tunnel extension itself,this article suggested an extension way,the 'jump grid slot cutting,interval blasting'-a hopping type of excavation.Then,it starts from the mechanism and mechanical characteristics of arch effect produced by hopping excavation.Under certain buried depth of the tunnel,through the reasonable arch axis model to establish an equation for calculating reasonable slot width and interval for hopping type of excavation.Based on the extension project of Chongqing Yuzhou tunnel,it has determined the reasonable cycle footage of hopping excavation with shallow buried tunnel extension.
【Fund】: 国家自然科学基金资助项目(No.50979112)
【CateGory Index】: U455.4
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