Research on Three-Dimensional Excavation Construction Technology of Deep-Buried Super Special-Shaped Section Shield Assembly Chamber
Based on the Chongqing Yangtze River Tunnel,the applicability of the three-dimensional excavation construction technology in the construction of shield assembly tunnel in urban deep-buried mountainous areas was explored.To meet the requirements of shield launching,the design of large-section mushroom-shaped assembly tunnel+inclined shaft transportation was adopted,and the longitudinal design was the transition section(15 m),the general section(35 m)and the sinking section(35 m).Considering the requirements of the construction period,the assembly tunnel was longitudinally optimized into a general section(15 m)and a sinking section(35 m).The length of the inclined shaft was changed from 216.76 m to 181.76 m to improve the slag removal efficiency.These meet the shield assembly and accelerate the project advancement.While meeting the construction safety,the upper section excavation method was optimized from the double side wall heading method to the middle partition method,which improves the construction efficiency.An intelligent monitoring system was built by concrete strain gauge and settlement convergence unit to monitor the deformation of the structure in real time and ensure the safety of the structure.
tunnel installation by shield machinecritical pathscheme optimization
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