Method for evaluating TBM construction collapse risk based on cloud model-nonlinear improved FAHP method

The invention relates to a method for evaluating TBM construction collapse risk based on a cloud model-nonlinear improved FAHP method, and the method comprises the steps: selecting risk factors related to geological conditions and tunneling parameters as evaluation indexes through the analysis of the pregnancy danger environment of a TBM construction collapse accident, carrying out the risk grade division of each index, and carrying out the calculation of the risk grade. Constructing a TBM construction collapse risk evaluation system; using a cloud model to replace a function formula to calculate a membership degree and construct a fuzzy relation matrix, and using a chromatographic analysis method to calculate an evaluation index weight vector; a nonlinear operator is introduced to carry out comprehensive calculation on the weight vector and the fuzzy relation matrix, and the final risk level of TBM construction collapse is determined according to the maximum membership degree principle; the method has good o