Safety Stability Assessment on Shield Tunneling Based on Game Theory and Extension Cloud
In order to study the fuzziness,randomness and weight issues among various evaluation indicators in the safety stability evaluation of shield tunneling,monitoring data such as ground settlement,building settlement,river embankment settlement,pipeline settlement and pipe segment settlement are selected as evaluation indicators.The game theory,analytic hierarchy process and entropy weighting are adopted to obtain the combined weighting,the expected value,entropy and hyper entropy of the evaluation indicators are calculated by the extension cloud model,and Matlab is used to calculate and draw cloud drop plots for each evaluation indicator.Finally,the weighting results of game theory are combined with the calculation results of the extension cloud model to construct a comprehensive evaluation model for safety of shield tunneling.There are 19 sets of monitoring data in actual engineering cases evaluated for safety and stability,and compared with the fuzzy comprehensive evaluation results.The result shows that(1)according to the combined weight results obtained by the game theory,analytic hierarchy process and entropy weighting method,the safety and stability evaluation indicators of the shield tunnel interval in this case are building settlement,segment deformation,ground settlement,pipeline settlement and embankment settlement in order of importance;(2)the safety stability of the 19 monitoring groups are evaluated by using the comprehensive extension cloud model,including 8 Level Ⅲ,4 Level Ⅱ and 7 Level Ⅰ,among which Level Ⅱ and Ⅰ nearby are needed to adopt corresponding prevention measures;(3)the comprehensive evaluation model built in this study based on game theory and extension cloud can reflect the uncertain relationship among various indicators,avoiding the one-sidedness of single weighting,compared with the fuzzy comprehensive evaluation,and the calculation results are more in line with the objective reality.Based on the study,a comprehensive evaluation method based on the combination of game theory and extension cloud model is proposed,which provides a new method and idea for shield construction safety evaluation.
tunnel engineeringstability assessmentgame theoryextension cloud modelshield tunnelingstratum of sandy pebble
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