Abstract: Manual measurement of the shieldtail clearance during shield tunneling has multiple disadvantages, such as low data accuracy, a long measurement period, and high difficulty. Therefore, the principles and adaptability of various intelligent measurement technologies are analyzed in this study. An automatic and realtime measurement method for the shieldtail clearance using intelligent imagerecognition is proposed, realizing intelligent measurement during shield tunneling. The accuracy and stability of the proposed system are validated by application to onsite construction. The measurement data are found to be in close agreement with the manual measurement results(97.4%). Thus, the stability and applicability of the manual measurement system have been improved by using measurement data software for automatic identification.

Key words: shield, shieldtail clearance, imagerecognition technology, intelligent measurement