About the author:

China Railway 18th Bureau Group Third Engineering Co., Ltd., Zhuozhou, Hebei 072750, China

Abstract:

Tool wear is one of the key problems affecting engineering cost and construction period duringshield tunneling, and the operating parameters of the shield machine and soil properties are importantfactors affecting tool wear. Aiming at this problem, a test simulation device for the shield tunnelingprocess is designed and constructed to simulate the tunneling process and study the tool wear mechanismunder laboratory conditions. The device has the functions of horizontal operation, low⁃speed operation,continuous contact between tool and soil, real⁃time measurement of torque, etc. In the experiment, thesoil samples of Nanchang Metro Line 4 were used to systematically study the tool wear behavior by settingdifferent tunneling parameters, such as cutter head speed and penetration rate. The results indicate thatthe average wear of the tool is reduced by 63%when reducing the cutter speed from 35r/ min to 10r/ min.The excavation duration is shortened from 80minutes to 10minutes, and the tool wear is reduced by 58%.In addition,with the increase of soil moisture content from 0% to 10%, the tool wear increasessignificantly. However,when the moisture content continues to increase to 25%, the tool wear shows adownward trend.