Estimation of cutter wear concerning secondary fragmentation in hard rock TBM tunneling
In hard rock TBM tunneling, disc cutter wear is caused not only by initial fragmentation of a rock face but also by fragmentation of residual rock pieces and blocks between a cutterhead and a rock face. These phenomena are considered as primary fragmentation and the secondary one, respectively. In order to appraise the total amount of cutter wear, the several indices have been proposed based on laboratory tests. It focused only on primary fragmentation. However, there has not been any studied on appraisal of cutter consumption and cutter life in TBM applications in consideration with the secondary fragmentation. In this paper, first, the equations to estimate the amount of cutter wear caused by the primary and secondary fragmentations were proposed. Also, the ratio of cutter wear by secondary fragmentation to the total amount of wear was defined by using these equations. Secondly, they were applied to two tunnels drilled by medium-scale TBMs through sedimentary rocks and granitic formation. The total amount of cutter wear was compared with the estimation given by the client and the appraisal of the cutter consumption was discussed based on the ratio of cutter wear by secondary fragmentation.
K.Tsusaka Y.Koizumi C.Tanimoto
Department of Global Architecture, Osaka University, Japan
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）