Construction Risk Management Research Of The Urban Tunnel By Shallow Tunnel Excavation Method

Shallow tunnel excavation method is applied to the city tunnel project has already quite mature, but due to the highly uncertain engineering hydrogeology condition and the complex environment of urban tunnel, tunnel construction risk accidents occur frequently. With the promulgation of the limited space of the relevant specification, risk management provides a new perspective for the channel, and also puts forward new requirements on the tunnel construction risk management. Through the analysis of the related literatures and related research, the field test method, the three-dimensional modeling method and the method of literature investigation and other research methods, this article dig tunnel in urban shallow tunnel construction risk management, put forward:1, according to the characteristics of tunnel accident risk and limited space related specification requires that the tunnel construction is defined as limited space operations;2, the new classification of tunnel construction risk:risk project itself, homework space environmental risks, risks and project construction stage especially must pay attention to the work space and the surrounding environment risk;3, according to project their own risk, using the checklist method and expert evaluation method of risk identification, risk matrix method is used to evaluate; For the environment risk, using the construction units can grasp of Kent index method on surrounding environment risk assessment; Space risk for homework, familiar with construction unit of LEC method is proposed to operation risk assessment space;4, using the methods of tunnel construction risk management, and summarize the construction risk management evaluation process, including former after assessment, safety assessment and evaluation;5, using the methods of tunnel construction risk management, confirming Kent index method and the three-dimensional modeling method results have good conformity; By using the methods of tunnel construction risk management confirmed LEC method and the rules and regulations of limited space has the very good conformity;6, through the theoretical research and empirical analysis, summarizes the limited space to tunnel urban shallow tunnel under the condition of the risk management process, easy to guide the construction of risk management.