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Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
Email:
cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Researches on Techniques for Shield Machines Entering Holes in Jiangxi Jiujiang Section of West-East Gas Pipeline II

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Key Words：West-East Gas Pipeline II； Jiujiang Shield； Slurry balance； Water-rich sand stratum

Abstract：Because there is poor bearing capacity in such soft soil layer as sand layer and sludge layer， it is necessary to take some measures to ensure that shield machines enters holes successfully in order to prevent water and sands from gushing when these machines enters holes in such soft soil layer. In Jiangxi Jiujiang Section of West-East Gas Pipeline II project， dewatering method was adopted to drain out groundwater and stabilize the soil body of the excavation face so as to prevent quicksand from occurring during construction. Pre-buried steel plates were welded together with each other to strengthen stabilization between these steel plates and strengthen stability of whole tunnels so as to prevent deformation of steel plates and circumferential weld leakage. Furthermore， adopted were a kind of composite sealing devices which consist of flaps rubber sheets and a ring of fan-shaped linking pieces and emergency seal air bags. In the aspect of shield construction progress control， corresponding tunneling modes were adopted in different tunneling stages. The above technical measures were so necessary for ensuring that shield machines enters holes successfully.