TY - Journal of Yangtze River Scientific Research Institute A1 - CAI Jia-yuan,ZHOU Chuan-bo,WU Cao T1 - Longitudinal Safe Spacing of Two Shields Excavating in the Same Direction of Double Line Parallel Subway Tunnel Y1 - 2016-12-20 JF - Journal of Yangtze River Scientific Research Institute JO - Journal of Yangtze River Scientific Research Institute SP - 105 EP - 108 VL - 33 IS - 12 UR - http://ckyyb.crsri.cn N1 - 10.11988/ckyyb.20150614 ER -