The invention discloses a shield tunnel joint sealing
gasket type selection method based on multi-criterion decision, which comprises the following steps of: selecting design
water pressure, maximum joint opening amount, maximum
assembly force and allowable maximum groove
filling rate as design threshold values; the average contact stress under the maximum seam opening amount, the maximum seam opening amount compatible under the design
water pressure, the closing compression force, the maximum groove
filling rate and the sealing
gasket sectional area are selected as performance evaluation indexes, different sealing
gasket evaluation index values are obtained through tests, the marginal effect of the indexes is considered, the marginal values of the sealing gasket evaluation indexes are obtained, and the performance of the sealing gasket is evaluated. And determining objective weights of the evaluation indexes by adopting a CRITIC method, and obtaining the sealing gasket with the best comprehensive performance in the different sealing gaskets by adopting a
TOPSIS method according to the marginal values and the objective weights. Scientific quantitative evaluation of the waterproof performance, the assembling performance and the economical efficiency of the sealing gasket is achieved through the multiple evaluation indexes, the
model selection result is more scientific, reasonable and economical, and
blindness of an existing design method is avoided.