Study On Risk Evaluation And Management Of The Mountainous Expressway Projects In Yunnan

In recent years,People more and more care about the environment changes and engineering safety caused by the highway engineering. Risks in engineering caused by many uncertainty factors which are got highly recognition. The correlative engineering risk analysis and risk management is becoming a new technique and a new trade,and this technique is gradually used in engineering praetice.Yunnan province is located in southwest China. There are very complicated natural environment and socio-economic environment. With implementation of the western development strategy, the mountainous expressway construction of Yunnan develops rapidly. From the projects which were constructed several years ago, such as yuanjiang-mohei expressway, chuxiong-dali expressway, shuifu-maliuwan expressway, the expressway construction of Yunnan is faced with many difficulties, especially large climate variation, complex geologic structure, steep geographic condition, fragile eco-environment, under-developed social economy, distinct humanistic environment, etc.. These mean huge engineering risks. So, it is very necessary to apply engineering risk evaluation and management to expressway projects of Yunnan.In this paper, the key and difficult questions in engineering risk evaluation and risk decision area are studied. The shuifu-maliuwan expressway project in Yunnan as the engineering example is detailed studied. The main contents researched in this paper are as follows:(1)Based on a lot of data, the main risks in stages of programme, design, construction and operation of the mountainous expressway project in Yunnan are exemplified and analyzed;(2)Based on the charactristics of the mountainous expressway construction in Yunnan, the risk identification and analysis method is introduced, according to different construction stages and structural types. And then, taking the shuifu-maliuwan expressway project in Yunnan as an example, the paper statistics the main risk factors, and demonstrates the main risk accidents and the possible risk sources. (3)Based on the charactristics of the mountainous expressway construction in Yunnan, anaiytic hierarchy process(AHP) is suggested to apply as appropriate engineering risk evaluation method; Engineering risk acceptance criteria, risk control measure and countermeasure for expressway projects in Yunnan are introducted. And then, taking the No.11 contract section of shuifu-maliuwan expressway project in Yunnan as an example, the risk weight is calculated, and the risk level is determined on the basis of the possible engineering risk identification and analysis.(4)Landslide risk evaluation method of the mountainous expressway construction in Yunnan, is proposed, from two aspects( hazard and vulnerability). And then, taking the No.14 contract section of shuifu-maliuwan expressway project in Yunnan as an example, the landslide risk value is calculated, and the risk level isâ…¢.(5)This paper eaplains the significance of risk decision-making, and introduces the method and process of risk decision-making, and discusses the effectiveness of risk control.And then, taking the No.6 contract section of shuifu-maliuwan expressway project in Yunnan as an example, the paper analyzes comparatively two engineering programs- tunnel and cutting, from the cost risk, project period risk and environment risk. According to the results, the decision-making value of cutting is 0.71, and the decision-making value of tunnel is 0.62. It is clear that tunnel program should been given exclusive priority.To sum up, the study results about engineering risk evaluation and risk decision of the mountainous expressway projects of Yunnan will help people to apply risk management method to expressway construction, to reduce engineering accidents and save cost.