TY - Journal of Yangtze River Scientific Research Institute A1 - TIAN Mao-lin, XIAO Hong-tian, YAN Qiang-gang T1 - Establishment of the Relationship Between Geological Strength Indexand Ultrasonic Velocity of Rock Mass Through Displacement BackAnalysis Based on Hoek-Brown Criterion Y1 - 2017-10-01 JF - Journal of Yangtze River Scientific Research Institute JO - Journal of Yangtze River Scientific Research Institute SP - 118 EP - 123 VL - 34 IS - 10 UR - http://ckyyb.crsri.cn N1 - 10.11988/ckyyb.20160656 ER -