The results indicate that surface subsidence may arise from dilapidating segments and constructing middle brace of continuous-double arch.
另外，拆除管片并开挖时、施做中墙时均会引起地面较大的沉降。
2
The construction plan of double-joined arch is validated using numerical simulation when dilapidating segments to construct single connecting tunnel between two shield-driven tunnels in this paper.