城市隧道上跨既有地铁隧道影响分析及处理

摘要

沈阳市南北快速干道工程隧道从既有地铁1号线盾构区间隧道上方穿过,两者结构竖向最小净距为2.483m,土体较薄,地质较弱.主体隧道在施工过程中不能影响下方地铁区间隧道结构安全和正常营运,施工难度和风险较大.经过理论分析和模拟计算,通过采用高强度MJS满堂加固、基坑土体分层快挖等措施,尽量减弱两者间的相互影响,从而有效保证了盾构隧道结构的稳定及地铁运营列车的安全.%North South Expressway Tunnel cross es over existing shield tunnel of Metro Line 1 in Shenyang, the minimum clear distance is 2.483 meter, where soil layer is thin and geology is weak.the influence on structural safety and normal operation of subway tunnel beneath is not allowed when centerpiece of tunnel is in construction, the construction is difficult and risky.By theoretical analysis and simulation, it's effectively to ensure that shield tunnel structure is stable and subway train is safe by using methods of high strength MJS layered foundation soil reinforcement and quick excavation of foundation with layers, which will try to reduce mutual influence.