| The ground fissure is a typical geological disaster in Xi'an and the construction program of Xi'an subway will inevitably pass through multiple ground fissures.Research on risk assessment model which is aimed at unitary risk source--the ground fissure is less in the Metro construction area affected by ground fissures.The aim of this paper is to describe and measure the risk of ground fissures in Xi'an Metro and provide the basis for future risk monitoring and control.In this paper,according to the existing research on the ground fissures,the hazard of ground fissures and the vulnerability assessment of subway project are analyzed.A hierarchical structure model is established for the risk evaluation index.We can determine the weight of each index factor by multiple comparison and using analytic hierarchy process,therefore the thirteen indexes of the factor level are divided into five grades according to the corresponding standards.The fuzzy-hierarchy comprehensive assessment model of the ground fissures disaster in Xi'an Metro is established: quantify the thirteen risk factors,construct evaluation matrix by membership function,make second level fuzzy comprehensive assessment of risk factors.Finally,the value of ground fissure hazard assessment and vulnerability assessment of subway project are obtained and the product is used as the value of risk assessment to determine the risk level.Risk assessment of ground fissures in Xi'an metro line three is based on the fuzzy-hierarchy comprehensive assessment model,and make a calculation of risk assessment and vulnerability assessment of subway which has been divided into ten parts and pass through the ground fissure area fourteen times.It is concluded that the risk level of the subway projects crossing the western section of ground fissure f7 three times and crossing the eastern section of ground fissure f5 is in the high risk level,and the rest of the subway crossing the ground fissure area are in the middle risk level. |
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