Tunnel construction usually causes disturbance of surrounding soil and structural dam-age of surrounding buildings.Combined with railway shield construction project and safety risk influen-cing factors,the risk evaluation index system is constructed.The cloud model is used to analyze the weight and quantify the safety level of the risk evaluation index model.The results show that the maxi-mum eigenvalue of the first-level impact index is 0.670,5.087,4.085 and 3.023 respectively.The safety level is the highest when the deformation modulus is[33,60]MPa in geology and hydrology.Based on all the index results,the risk assessment model of railway shield construction is feasible for the construction safety impact index,which provides technical reference for construction safety manage-ment.
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