A tunnelsubsidence is caused by groundsubsidence, and the security of the tunnel directly impaired.
地层沉陷导致位于该地区的隧道随之沉陷，直接影响到隧道的安全使用。
2
The norms of the groundsubsidence for tunnel construction allowed by ground structures, underground pipelines and metro are studied.
研究了地面建筑物、地下管线及地下铁道允许的隧道施工引起的地表沉降基准；
3
During the construction of shield machine, tail void grouting is a necessary and key procedure, which can actively control the tunnel uplift and groundsubsidence.