English：

In the process of shield tunneling, due to factors such as geology and shield operation, theoverall or local deformation of the shield tail will be caused. When an overseas large⁃diameter underwatershield was excavated in high buried and iron slab sand stratum, the local deformation of the shield tail ofthe shield machine occurred, and the shield cannot continue the excavation. After the analysis of thecauses of the deformation of the shield tail , the hole coring exploration and correction construction of theshield tail , the local deformation of the shield tail was restored, and the shield was freed from the trap.The causes of shield tail deformation and the control measures were analyzed. It is concluded that thelocal maximum deformation of the shield tail is related to the following factors such as formationparameters, shield attitude, partition pressure, penetration, imitation cutter opening stroke, and radialhole sand discharge. The artificial neural network prediction model is used to train 25 groups of shield taildeformation samples, and the prediction model of the maximum deformation of the shield tail after eachring excavation was obtained. The accuracy of the model was verified by the other five groups of shield tail deformation data, which is used for the prediction of shield tail deformation in subsequent shieldtunneling. Through practical demonstration, the error between the predicted deformation value and themeasured value of the BP neural network model is within 10%, and the predicted value is larger than themeasured value, which can be used to predict the deformation of the shield tail of the shield in the highburied depth and the iron plate sand stratum.