Research on Qingfeng Tunnel of Xi'an-Chongqing High-speed Railway Underpassing Existing Tunnel Based on Intelligent Monitoring
In order to study the influence of new tunnel undercrossing excavation on the existing tunnel,through field investigation,intelligent monitoring and numerical simulation,the structural stability indexes such as crack propagation,vertical settlement at the bottom and horizontal displacement of side wall of existing tunnel lining are obtained.The results show that when the new tunnel is excavated,the deformation or even displacement of the overlying strata tends to the new tunnel space,which affects the structural stability of the existing tunnel.The stability of the existing tunnel structure is affected by factors such as proximity distance,buried depth and section.The intelligent monitoring results of the stability of existing tunnel structures can provide feedback for the construction of new tunnels.
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