TY - Journal of Yangtze River Scientific Research Institute A1 - ZHAO Li-cai T1 - Experimental Study on Creep Characteristics of Sandstone under Step Loading and Unloading Y1 - JF - Journal of Yangtze River Scientific Research Institute JO - Journal of Yangtze River Scientific Research Institute SP - 67 EP - 72,79 VL - 38 IS - 2 UR - http://ckyyb.crsri.cn N1 - 10.11988/ckyyb.20191419 ER -