Research On Risk Management Of Tunnels In Karst Area

The tunnel construction, because of the great investment, long construction period, many construction projects, complicated technology, many factors of unforeseen risk, largely influenced on the social environment, is a high-risk construction project. The construction of the karst tunnel is a hotspot and difficulty in the area of tunnel engineering, carrying out the risk assessment and adopting scientific and reasonable avoided measures is very necessary and pressing.Based on the HuiLong mountain tunnel of the ShaoGan expressway, the risk assessment about the karst tunnel engineering construction and risk management are researched, the main research contents are as follows:(1) The domestic and abroad scholars' study on the theory of tunnel project risk assessment and management and the practical application of risk assessment are stated, and some existing problems are summarized.(2) the methods of karst tunnel project risk assessment are summarized, their advantages and disadvantages and the range of application are analyzed; the steps of the risk assessment, especially, the process steps of fuzzy comprehensive hierarchy analytic method are clarified; Summarizes the common risk management strategies and measures applied in the tunnel project are induced.(3) Based on the HuiLong mountain tunnel of the ShaoGan expressway, the risk assessment about the karst tunnel engineering construction is researched. Referring to "railway tunnel risk assessment and provisional regulations of the administration, combined with the geological conditions of HuiLong mountain tunnel , the experts get the basic risk factors of HuiLong mountain tunnel ,then using the analytical hierarchy process to get the relative weight of basic risk factors, carrying out the fuzzy comprehensive evaluation method for various levels all the risk rank of risk factors, eventually this paper get the risk assessment results that landslide risk, sudden water gushing risk and large deformation risk and overall risk are all level 3, according to risk decision criterion, it is concluded that the measures should be taken to reduce risk or transfer risk .(4) According to the risk assessment results of HuiLong mountain tunnel in the ShaoGan expressway, the prevention and treatment of landslide risk and emergency measures are put forward, the specific risk response measures and accident treatment plan about karst geological phenomena of HuiLong mountain tunnel are given; At the same time, according to the requirements of tunnel informationalized construction, monitoring measurement and geological forecast are implemented, so as to ensure the safety of the tunnel construction.