The Mechanism And Characteristics Study On Rebound And Recompression Of Immersed Tube Tunnel Foundation Off The Coast

People’s requirements for fast and convenient transportation is higher and higher with therapid development of global economy.As the development of the civil engineeringconstruction technology and the development of the theory of rock mass is perfect. Peopleconsider using the tunnel under the water way to reduce the distance of the parties. This kindof tunnel construction is gradually increasing.The calculation of the immersed tubefoundation settlement is urgently needs to solve.This aperbased on the immersed tube tunnel project of the Hong kong-zhuhai-macaobridge cluster projects, has studied the tunnel foundation’s rebound andecompressionmechanism by numerical simulation, the stress path test and geotechnicalcentrifuge model test. the deep groove section. Using numerical simulation method tocalculate the values in different depth of soil which under different conditions(excavationunloading, immersed tube placed, back silting load,and some paragraphs of waterwaydredging excavation),Which provides numerical values for triaxial stress path test. We getdifferent soil modulus value by stress path test. Based on the typical cross section’s reboundand compression numerical simulation and centrifugal model test then analysis of immersedtube tunnel foundation rebound and compression feature.This paper chosedsome typical crosssectionswhich contain deep groove section, deep clay layer subsoil, mixed silty sand layer andchannel excavation for detailed research. Analyzed the scope of the base foundation ’srebound and recompression.,the effect depth of the foundation’s rebound and recompression.,therelationship between the rebound and recompression,and the relationshipbetweenpost-construction settlement and time.