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| Discussion on the Harm of Harmful Gases of Hangzhou Tunnel and Its Countermeasures |
| CHEN Guang-feng1,CHEN Hui-fang2,HONG Min3. GUAN Jin-lin3, ZHAO Rong4 |
| 1. Tsinghua University, Beijing 100084; 2. China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 3. Beijing Urban Construction Municipal Subway Foundation Engineering Co. Ltd, Beijing 102209, China; 4. Beijing Institute of Civil Engineering and Architecture, Beijing 100044, China |
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Abstract Research purposes：Marsh gas exists in the area from Binkang Road Station to Westxing Station of Line 1 of Hangzhou subway. If the marsh gas gathers in the tunnel, it'll cause harms to the construction of shield tunnel and the operation safety of the tunnel, and even the probable gas blast can cause the harms to the surrounding residents and buildings. Based on indoor simulation experiment and analysis as well as the full-scale experiment, the critical influence values and preventive measures are presented.
Research conclusions：Through analyzing the harmful degree of harmful gas on the underground construction and environment, the security assessment contents necessarily done to the harmful gas contained in soil is are worked out. For construction of Hangzhou subway, the study is done on the solution to emission of the marsh gas. By doing the indoor simulation experiment and field full-scale experiment, the critical influence values of the marsh gas on the construction and operation of tunnel are obtained. In addition, it is necessary to drill some holes into ground to emit the marsh gas contained in shallow soil for reducing or eliminating the hidden safety danger so as to ensure the safety of the tunnel construction and operation.
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Received: 16 March 2010
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2010, Vol. 27 
