Subway Tunnel Shield Construction Surface Subsidence Mechanism And Control Measures

This thought was study by background that Shijiazhuang Metro Line Tangu ~ large section tunnel excavation Zhaohui bridge construction influence on ground settlement are analyzed,a two-dimensional numerical model are analyzed in four sections,monitoring and calculation results and actual engineering value are compared,verified the simulation feasibility and the correctness of the finite element numerical method;excavation section C of different 2-D numerical simulation calculation by the finite element software ANSYS,including CRD method,three machine,double side drift method and CD method,respectively for each excavation method on the influence of surface subsidence and the change rule as the selection of large section of dark the most suitable method for tunneling.According to the C section of a three-dimensional finite element model in the anchorage zone of the anchorage zone,applying advanced support under three different conditions were calculated,resulting in the anchorage zone,advance support construction measures and other factors on the ground subsidence,the law of development,and take corresponding measures after the settlement changes the law on the ground.Through theoretical calculation and numerical analysis model of bridge tun nel excavation Zhaohui solid ~ forecast and Analysis on the influence of surfa ce subsidence on Shijiazhuang metro line on,through the actual construction p rocess parameter setting and monitoring data of the actual value acquisition,fi nally settling rules and construction experience,and provide a reference referen ce for the settlement mechanism and control measures of similar strata.