The Research And Application Of Karst Landform Subway Tunnel Construction Risk

In recent years,the Subway tunnel project has developed rapidly and the construction scale is more and more large.At the same time,the subway tunnel construction process also faces a variety of challenges and risks.Compared with the ground construction project,there are typical geological environment complex and changeable,the process is diversified,the working space is limited,the cost is large,the construction period is long,the construction technology is difficult,the stealth risk is many and the social influence is big,the construction risk management brings the great difficulty.Under the condition of Karst geomorphology in southwest China,there are often large-scale land collapse,water inrush,scarf building collapse and other engineering accidents in the process of subway tunnel construction,and once the accident occurs,it will have a very bad social impact.Under the condition of Karst geomorphology in southwest China,there are few researches on subway tunnel construction,and the risk management theory is not perfect,which leads to the frequent accidents(disasters)in the course of tunnel construction,and it is urgent to combine the reasonable risk evaluation method to analyze the risk of Metro tunnel project more accurately,and effectively reduce the risk of subway tunnel construction.Under this background,it is of great practical significance to study and apply the risk assessment of tunnel construction in karst geomorphology Metro mine.Aiming at the shortcomings in the study of subway construction risk in China,this paper is based on Wbs-rbs matrix,AHP method,ANP method and fuzzy comprehensive evaluation method,and takes Guiyang metro line Line 2 phase 6standard section Honesty Road Station ~ View Shanxi Road station interval construction project as an example,This paper studies the risks encountered in the construction of subway tunnel under Karst geomorphology under the method of mine method construction.In order to make up for the research gap of the risk assessment of Metro construction project under the condition of karst geomorphology,it also provides reference for the risk management in the process of similar metro construction in China.The main research contents are as follows:(1)To study systematically the principle and steps of tunnel construction in Karst Landform Subway mine,and analyze various risk mechanisms in construction.(2)using the WBS method to decompose the work structure of the Subway mine method construction,using RBS method to decompose the risk structure of thesubway mining method construction,and construct the construction risk Wbs-rbs matrix.(3)The comprehensive and systematic identification of all possible risk factors in the construction process,the selection of key risk factors through expert scoring method,the key risk factors as the main influencing factors of subway mine tunnel construction risk assessment,and the construction of Karst Landform Subway mine tunnel Construction Risk Evaluation Index system.(4)using triangular fuzzy number and fuzzy analytic hierarchy Process(F-ANP)to construct the risk evaluation model of karst landform Subway mine tunnel construction based on fuzzy network analytic hierarchy method,and verify the reasonable validity and practical significance of the model with an example.