Risk assessment method for surface collapse caused by water supply and drainage pipeline

The invention discloses a risk assessment method for surface collapse caused by a water supply and drainage pipeline. The risk assessment method comprises the following steps: establishing a grading standard about a grade h by an assessment index ci; calculating the comprehensive weight wi of each evaluation index according to the subjective weight ai and the objective weight vi of each evaluation index; calculating the comprehensive relative membership degree of the evaluation index set of the evaluation object u according to the relative membership degree matrix KC and the dynamic comprehensive weight vector w; according to the normalized comprehensive relative membership degree of the evaluation object u, calculating a specific risk score of the evaluation object u; and according to the specific risk score of the evaluation object u, determining a risk level of the evaluation object u. Compared with an existing risk assessment method, the method has the advantages that the dynamic weight coefficient of eac