TY - Journal of Changjiang River Scientific Research Institute A1 - WANG Jun-zhi, DU Peng-zhao, NIU Zhao-xuan T1 - An Auto-classification of Rockmass Discontinuities Based on K-meansCluster Analysis and Cluster Validity Index I: Researchand Application Y1 - 2018-09-01 JF - Journal of Changjiang River Scientific Research Institute JO - Journal of Changjiang River Scientific Research Institute SP - 109 EP - 113 VL - 35 IS - 9 UR - http://ckyyb.crsri.cn N1 - 10.11988/ckyyb.20170290 ER -