RESEARCH AND APPLICATION OF U-BIT CONSTRUCTION METHOD IN SUBWAY STATION ENGINEERING LOCATED IN SATURATED SOFT SOIL AREA

In order to solve the problems existing in construction of underground structures located downtown saturated soft soil area, such as insufficient site, complex adjacent and great impact on surrounding environment, method bundled integrate tunnel(U-BIT) is proposed. this method, after steel pipes jacking completed, concrete filled into pipes, prestress tensioned make each independent pipe combined form a whole bearing structure, so achieve purpose reducing size structural components, improving stiffness capacity. Based mechanical properties test project Wuding Road Station Shanghai Metro Line 14, failure mechanism tension technology prestressed tendons narrow space variation rules ground surface subsidence are systematically studied. The research shows that seam sections will be destroyed before sections, ensuring performance very important sure safety. Since an overall stable structure under effect, subsequent excavation has little influence deformation. Therefore, above can control effectively reduce engineering environment.