Risk Acceptance Criteria Of Long Large Tunnels In Construction Period

Tunnelling works are characterized by high degree of uncertainty, complexity and invisibility. There are plenty of risk factors in large tunnel works, and risk management is urgently needed because of the high level risk of construction. Risk management in civil engineering is substantively a dynamic balance between risk level and cost of risk reduction measures. The essential problem is: How Safe Is Safe Enough. The Risk Acceptance Criteria is the way to answer this problem.The dissertation is part of the project Research of Construction monitoring, hazard perception & alarm and risk management system of tunnel engineering (Serial number: 04dz12021) supported by Shanghai Municipal Science and Technology Commission and also supported by New Century Excellent Talents Program of Ministry of Education. At first, risk management frame in tunnel and underground engineering and the role of risk acceptance criteria is discussed. On the base of comparative analysis of risk acceptance criteria researches in China and abroad, qualified and quantified risk acceptance criteria model for long large tunnel in China in construction period is proposed. Finally, the model is applied in Shanghai Yangtze River Tunnel.The important contents and the conclusions of the dissertation are as follows:(1) Comparative Research of Risk Acceptance Criteria in China and Abroad. The Criteria and corresponding quantitative risk analysis measures abroad are compared and analysed. The research is classified into individual risk, societal risk, economic risk, environmental risk and integrated methods according to the different consequence type. Then, the evaluation of human life in the multi-objective decision making is researched.(2) Risk Acceptance Criteria Modelling of Long Large Tunnels. The improvement of risk management and risk acceptance criteria researches is summarised, then qualified risk acceptance criteria for long large tunnel in China in construction period is proposed. And the corresponding quantified criteria model is then proposed as the essential part of the dissertation. The quantified model is divided into three parts: individual risk acceptance criteria, societal risk acceptance criteria and economic risk acceptance criteria model.(3) The Risk Acceptance Criteria of Shanghai Yangtze River Tunnel. Take...