Abstract:

The TBM disc cutter wear is serious when boring in monzonitic granite strata of Qinling Mountain. The abrasion performance of the rock and the wear resistance performance of the cutter ring are clarified by laboratory test on rock samples and the cutter ring materials taken from Lingnan TBM Section of Hanjiang RiverWeihe River Water Conveyance Project. The abrasiveness of rock is affected by compressive strength and mineral composition of rock; and the wear resistance of the cutter ring is mainly affected by the composition and organization of the materials. The wear rules of different disc cutters are figured out by the analysis of cutter usage and wear data gained from 2 000 m test section. It is found that: 1) The cumulative wear of the inner cutters shows approximate linear with the installation radius increase; and the maximum cumulative wear of edge cutters occurs at the transition zone. 2) The wear rate calculated by unit rock breaking volume is superior to wear rate calculated by unit tunneling distance in terms of wear speed of disc cutter. 3) The repeated wear has great influence on the wear of edge cutters; and by increasing the numbers of disc cutters in the marginal area, the wear resistance of disc cutter can be improved, to a certain extent; but it can not be improved basically.

Key words: tunnel, TBM, disc cutter, wear rule, monzonitic granite strata, Hanjiang RiverWeihe River Water Conveyance Project