罗湖～国贸区间重叠盾构隧道施工

Construction of Overlap Shield Tunnel at Luohu～Guomao Section

结合罗湖～国贸区间重叠隧道盾构施工，采用有限元方法分析了施工阶段重叠盾构隧道的相互影响，确定了先施工下部左线隧道，对周边岩土进行注浆加固，再施工上部右线隧道，然后注浆加固的施工顺序。施工右线隧道时，对左线隧道位移和深层沉降进行监测并采取选点注浆、架设支撑的辅助保护措施。同时，对右线隧道下卧层土体进行注浆加固，保证隧道稳定及减小隧道之间影响。

Interaction of overlap shield tunnel is analyzed by finite element method based on construction of Luohu - Guomao section. Then, the best construction procedure is determined, which is constructing lower left tunnel and reinforcing its surrounding soil by grouting firstly, and constructing upper right tunnel and reinforcing it by grouting secondly. During right tunnel construction, displacement and deep settlement of left tunnel are monitored, and assistant protection measures are adopted including points grouting and erecting supporting. At the same time, soil below right tunnel is reinforced by grouting method to keep stability and reduce influence between tunnels.