Abstract: In the process of shield tunnel construction, how to dynamically correct the trajectory of shield is one of the difficult problems. Through analyzing factors affecting the attitude of shield, an Scurve correction method for the trajectory space of shield is proposed. Based on tunnel design axis, shield posture, shield size, construction parameters，etc., shield trajectory is predicted and corrected from its current position with segmental layout optimization algorithm, which can ensure that the shield segment returns tangentially to the designated position of the tunnel design axis one by one, and the quantitative values of predictive control parameters of shield posture and segmental layout under the optimal assembly point are given. Integrated with the above research results, the dynamic deviation correction analysis software of Tongji Shuguang was developed for shield tunnel. The software automatically interconnects with the data of shield measurement system, dynamically corrects the motion trajectory of shield in real time, and outputs construction control parameters such as predicting the optimal assembly point of segment ring and corresponding shield tail clearance. The engineering application shows that the dynamic deviation correction algorithm takes the current state of shield into consideration comprehensively, and is suitable for shield tunnel with different posture and axis line, and the results are reasonable, reliable, and universal.

Key words: shield tunnel, shield machine, driving posture, deviation rectification method, S-shaped curve