Research Progress on Influence of Small Curvature Shield Tunnel Excavation in Complex Environments Such as Adjacent Foundation Excavation
With the deepening of urbanization in China,the construction of subway tunnels often adopts the design of small curvature tunnel sections to avoid complex existing buildings.At the same time,accidents caused by shield tunnel excavation occur from time to time,so the influence of small curvature tunnel excavation should be paid more attention to.In order to understand the current research status and academic trends of the influence of small curvature shield tunnel excavation in complex geotechnical environment,the research results,hot issues and development directions of the influence of small curvature shield tunnel excavation in geotechnical environments such as adjacent foundation excavation,existing tunnel(pipeline)pile foundation structures,and dense ground buildings at home and abroad are summarized.The existing research results are classified and discussed according to three different geotechnical environments.Then,the research progress of the influence of small curvature tunnel excavation in various environments is expounded from the aspects of theoretical analysis,numerical simulation and field monitoring.Finally,the shortcomings and gaps in the existing research on different geotechnical environments are put forward.It is suggested to consider the influence of small curvature tunnel excavation under the coupling effect of unloading and dewatering in excavation,nonlinear soil deformation and multi-layer heterogeneous strata,more comprehensive sensitive parameter analysis,improvement and expansion of monitoring database.
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