Analysis of the Carbon Monoxide Released Law Caused by Shield Construction in Shallow Stratum in Sea Reclamation District
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Carbon monoxide released in shallow stratum in sea reclamation district is a difficult problem in the process of shield construction. Based on carbon monoxide released in shallow stratum in the process of shield construction of Dengliang-Houhai section in Shenzhen Metro, this article analyzes the occurrence characteristics of carbon monoxide in shallow stratum from three respects in sea reclamation district, including geological conditions, reserving conditions, and occurrence structure. It also analyzes the disaster mechanism of carbon monoxide released in shallow stratum, and studies the carbon monoxide released law caused by shield construction from the dynamic and the static, including the rapid release, the slow release, the released volume concentration, and the pressure of gas bearing formation. The results show that the rapid release of carbon monoxide has a greater influence on the soil deformation compared with the slow release. The soil deformation is mainly elastic deformation, and the maximum occurs near the medial axis. The released volume concentration of carbon monoxide was relatively high from shield tail to trolley 5 under dynamic conditions, but it is large for internal soil chamber under static conditions.
KeywordsSea reclamation district Shield tunnel Carbon monoxide Soil deformation
The research work described herein is supported by the National Natural Science Foundation of China (No. 41072205, No.50579097), the Shanghai Natural Science Foundation of China (No. 10ZR1431500).
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