Risk Assessment of Utility Tunnel Construction based on Improved D-S Evidence Theory
In view of the construction safety problems caused by the utility tunnel construction,a research idea of multi-sensor information fusion based on cloud model and improved D-S evidence theory is proposed.Considering the fuzziness and randomness of the utility tunnel construction in the safety assessment process,a multi-index system for safety assessment is constructed.The basic probability assignment of each index is completed by means of the cloud model,and the Mahalanobis distance is introduced to improve the evidence conflict during multi-sensor information fusion.The entropy method is used to assign weights to different types of monitoring projects,and then the fusion of the membership functions of each monitoring index is completed,which enhances the reliability of fusion results.The risk assessment method is applied to the construction example of the utility tunnel to verify the effectiveness and feasibility of the research method.The results show that the membership degree of the overall safety assessment of the construction of the utility tunnel is m=[0.306 8,0.643 3,0.045 2,0,0,0.004 7],indicating that the construction of the utility?tunnel is in a low risk state as a whole,which is consistent with the results of on-site inspection.The research can provide a feasible idea for the multi-index comprehensive safety assessment of the utility tunnel construction.
safety of utility tunnel constructioncloud modelD-S evidence theorymulti-source information fusion
NETL
NSTL
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