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| Analysis of Influence Mode of Shallow Gas on Construction of Hangzhou Metro |
| GUO Ai—guo1，SHEN Lin—chong2，ZHANG Jin—rong2，QIN Jian—she2，Huang Xian—feng2，WANG Yong1 |
| 1．Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2．Hangzhou Metro Group Co．Ltd，Hangzhou，Zhejiang 310020，China |
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Abstract Research purposes: The shallow gas existed in the soil stratum from depth of 15m to 30m under some section of Line 1 of Hangzhou metro might have influences on the constructions of the metro stations and shield tunnels．Based on consideration to the characteristics of shaHow gas and gassy soil，the influence mode of shallow gas on the construction of underground structures was analyzed and the corresponding measures were presented to prevent the disasters during the construction．
Research conclusions: During the construction，the uncontrolled release of shallow gas would seriously disturb the soil layer．The distablization of the trench wall or hole wall and the upheaving of foundation ditch might happen because of the high gas pressure．Moreover．there was the hidden peril of safety accident when shielding Was conducted across the gas soil layer．So，the measures like controlled release of the shallow gas had to be taken during the construction to prevent the disasters caused by the shallow gas．
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Received: 01 June 2010
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2010, Vol. 27 
