Research On Fully Enclosed Spraying Waterproof System And Reliability Of Shallow Tunnel

In general,the mining method of tunnel drainage prevention type design for the main row,Under special circumstances,the pattern of "blocking and binding" is adopted.In recent years,People begin to realize the arbitrary discharge of groundwater caused varying degrees of damage to the local ecological environment and groundwater resources and environment.with the promotion of environmental protection awareness,This paper presents a new type of fully enclosed waterproofing system for shallow tunnel in urban area.Taking into account the various types of tunnel engineering in our country at present stage of the leakage of water is very common,The waterproof effect of tunnel is not satisfactory.Based on the present situation,this paper studies the reliability of spraying and waterproofing system in shallow buried tunnel.The main research contents and results are as follows:(1)This paper makes a comprehensive study on the control technology of underground water in tunnel engineering,Summary of the drainage system of China’s traditional mining method of mountain tunnel,city tunnel and underwater tunnel,Based on the proposed for a shallow buried tunnel closed spraying waterproof system,and the mechanism are discussed in detail.(2)The relationship between system reliability and efficiency,the project cost and schedule are discussed,through the failure mode effects and Criticality Analysis(FMECA)technology of spraying waterproof system failure mode and failure reasons,with expert questionnaire form of risk factors and risk of closed spraying waterproof system of value and risk index.And the dangers of the matrix of risk factors were compared with hazard analysis.(3)This paper introduces the basic concepts,modeling steps and analysis methods of fault tree analysis(FTA)technology for system reliability and risk assessment,On the basis of this,the fault tree model is established,and the qualitative analysis and quantitative analysis are carried out.(4)the concept and algorithm of Bias network model are introduced,and the reliability evaluation of spraying waterproof system is introduced by using the neural network.On the basis of fault tree,the paper establishes a Bayesian network model of spraying waterproof,and carries on the risk analysis and risk identification to the spraying waterproof system.This paper carried out some research work on shallow buried tunnel closed spraying waterproof system mechanism and reliability,to find hidden dangers in the spraying waterproof system and weak links,improve the waterproof system reliability,have important significance to guide the tunnel anti drainage design,construction and operation of nutrition protector.