Large Section Of The Tianjin Subway Tunnel Construction Technology And Supporting Measures Research

For the urban transport, the modernization of the China’s urban constructionset forward higher requirements for the subway project has unique advantages, it has been widely used in many large and medium-sized cities. But excavationconstruction of City Tunnel, especially excavation construction of large sectiontunnel construction methods, technology construction support, the stability of theconstruction of the tunnel has its own special requirements, there need to raise a large section tunnel excavation construction the level and stability analysis.1#fan room face tunnel excavation Construction of Tianjin Metro Line1isthe main research, the conditions of Tianjin Institute Geology and hydrologicalthe excavation and construction of the metro section tunnel, the tunnel excavation and construction of security is closely related to strata pre-reinforcement technology, the main structure construction and waterproof technology of the tunnel structure studied by numerical calculation analysis of the surface deformation of alarge section tunnel indifferent excavation program with the main structure and support the internal forces,deformation and structure of the tunnel construction force to monitor the measurement to ensure the safety of tunnel construction。(1) Tianjin regional engineering geological and hydrogeological conditions, a large section tunnel excavation Construction CRD engineering methods excavationhas been used. The main structural support, water and other key technologies in the section of the tunnel construction have been studied.(2) Tianjin geological conditions and the characteristics of the hydrological conditions,the weakness of its strata, rich in groundwater, precipitation construction ofland subsidence is quite large, so the strata pre-reinforcement technology to ensure thestability of surrounding rock. From both theory and practice on the formation pre-reinforcement methods and processes describ ed by grouting laboratory experiment has been actually consistent with the engineering grouting parameters to ensure the quality of the grouting.(3) By numerical simulation on the stability of large cross section tunnel excavationprogram analysis, the results show that the structure of power and the keyprocess is the construction sequence for different construction sequence, and take corresponding measures to ensure construction safety. By numerical simulation to find the key linksand controlling factors of the construction process and provideguidance for the tunnel construction and monitoring measurement.(4) Monitoring and measurement, by the force of deformation and structure in the tunneling to ensure that the large cross section tunnel construction safety, but also the rationality of the construction methods used were validated.The above research results for the weak strata and ground water-rich region, theconstruction of a large section of the tunneling method subway tunnel project reference and guidance. Design,construction, research and other work on the subway with some reference value.