Construction Control Technology for an Urban Subway Shield Tunnel underneath an Operational Railway
(1 Tianjin Construction Engineering Co. Ltd. of the China Railway First Engineering Group, Tianjin 300250; 2 School of Civil Engineering, Central South University, Changsha 410075)
Abstract��
With the large-scale construction of urban rail transit, it′s very common to approach various types of construction works, which poses great construction challenges. A study on the construction control of shield tunneling beneath an existing railway is conducted based on the running tunnel from Tujiachong station to Tiedaoxueyuan station of Changsha Metro Line 1. Construction control programs such as rotary pile reinforcement and overhead line reinforcement (longitudinal lifting of the existing railroad using cantilevers of I-beams) are proposed, and a numerical simulation is carried out. The results indicate that the deformations of the subgrade and existing railroads can meet the requirements of railway operation safety when the above construction control measures are used and that the proposed control measures are effective and reliable.
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