Settlement Deformation of Existing Tunnel Caused by New Tunnel Obliquely Crossing Excavated Underneath
XU You-jun1, GE Shao-ying2, SUN Chao1
1.College of Architecture and Civil Engineering, Inner Mongolia University of Science and Technology; 2.Municipal Engineering Company, Shanghai Baoye Group Co., Ltd.
Abstract：
According to a new tunnel obliquely crossing under the existing tunnel of high speed railway passenger dedicated line, advanced reinforcement for the reserved excavation area, than excavation. By simulating the settlement deformation of the existing tunnel under different conditions, and compared with the result of empirical formula as well as the measured income of the existing tunnel, based on the above, to research the influence of new tunnel construction obliquely cross on existing tunnel with a cross section of different position monitoring. The results show that the influence of new tunnel with anchor and leading conduit of reinforcement can effectively control the settlement value in the permitted range, the cross section of existing tunnel structure will produce torsion, suggestions grouting reinforcement for the tunnel.
