Study On Key Technologies Of Urban Transmission Tunnel Construction

With the extensive development of underground space in urban area, urban power tunnel, Pipe Gallery engineering more and more applications to urban construction. In the transformation of the old underground tunnel project gallery, facing the most built-up urban construction and occupation need close roads and other issues.In this paper, a city rail tunnel control center power engineering, electric power survey Shallow Tunnelling Method Key construction technique. Research in the following key construction technology, combining pilot project application, and summarized.Through the tunnel cave grouting by mini tube technology for pre-ground reinforcement were single and cement slurry according to the geological conditions-water glass double grouts, use the Sleeve Valve Pipe formation of surface area in the local underground pipeline leak reinforcement;In this paper, through a power tunnels from research, to study and analyze all aspects of construction, preliminary determination grouting by mini tube technology, surface strata grouting technology measurement and monitoring technology is the key technology of underground excavation engineering, construction is the key and difficult to control. Case in practice some measures should be further improved, can be used as a reference for similar construction.Through engineering analysis, selected the observations and parameters, finite element simulation and data analysis, simulation analysis of these parameters,simulation development curve to infer indicators, the simulation results were analyzed at the same time, to tunnel indicators were monitored.Monitoring of tunnel construction process to develop sophisticated measurement methods, the use of advanced technology to monitor a large number of surface subsidence, tunnel crown settlement, convergence peripheral clearance, building underground pipelines and surface subsidence and tilt, surrounding rock and supporting structural state of real-time monitoring and feedback. By analyzing the number of monitoring indicators curve, combined with simulation analysis and comparison of data to draw conclusions, the initial judge monitoring results and simulation analysis consistent use of the method has some significance.Finally, according to the Case of the project, concluded adaptability Shallow Mining Method under the corresponding geological strata conditions and limitations of this kind currently proposed construction methods and the direction of future development.Looking to the future direction of urban development, Shallow Mining Method to be quite promising, worthy of further study, the paper concludes with ideas and direction of further study in this subject.