Abstract:

Slurry shields are often used in the construction of superlarge diameter tunnels, but many problems such as a large diameter, complex geological conditions, and serious abnormal cutter damage are encountered in the process of shield tunneling. To monitor the cutter status in realtime and improve the accuracy of manual cutter checking during shield tunneling, a diagnostic system for checking the disc cutter status used in superlarge diameter slurry shields is designed; the realtime monitoring and condition diagnosis of the rotation speed, wear, and temperature of cutters as well as the geological analysis technology based on the monitoring data acquired from the cutters are realized. In this article, the hardware design and testing principle of the cutter diagnostic system are described in detail; typical abnormal data collected in the Shantou Su′ai tunnel are analyzed, and the abnormal states of the cutters are identified. Further, based on the realtime rotation speed data of the cutters and the angle data of the cutterhead, the geological realtime sensing technology of the cutter face is investigated and applied in the western line of the Shantou Su′ai tunnel; good results have been obtained in the raised section of bedrock, which provides a direct basis for optimizing the driving parameters and judging the range of the bedrock intrusion face and cutter state accurately.

Key words:

superlarge diameter slurry shield, Shantou Su′ai tunnel, disc cutter status diagnosis, tunnel face geology analysis