Deformation Analysis of Double-Line Shield Tunnel Crossing Coastal Embankment with Soft Ground Reinforcement
To investigate the impact of double-line shield tunneling on the sea dike in the coastal soft soil area,a three-dimensional finite element simulation model was established based on the Zhuhai Hengqin Mangzhou Tunnel Engineering.Different soft ground treatment measures,namely Deep Cement Mixing(DCM),Mixed Jet Support(MJS),and Triaxial Mixing Pile treatment,were applied.The stress-strain distribution characteristics of the reinforced sections after the tunnel shield completion were comprehensively analyzed,revealing the settlement distribution pattern of the reinforced ground and evaluating the effectiveness of the reinforcement.The research findings indicate that during the tunneling under the sea dike,the area near the junction of the dike base and the water area experiences the highest deformation of the soil.However,when the tunnel shield completes its construction,the sea dike,tunnel lining,and surrounding rock mass form an interactive system.Both the maximum settlement value of the dike's topsoil and the maximum deformations of the tunnel lining fall within the safe range.Based on these research results,relevant construction suggestions are proposed for the reinforcement scheme of existing tunneling projects beneath sea dikes.
tunnel engineeringshield tunneling constructionseawallground reinforcement of soft foundationnumerical simulation
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