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| Study on Optimization of Construction Schemes for New Tunnel Under-pass the Existing Subway Station at Short Range |
| ZHU Zheng-guo, YU Jian-tao, ZHU Yong-quan, WANG Jin-tao |
| Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China |
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Abstract Research purposes: In order to optimize the construction scheme and ensure the safety and operation of the existing station structure, the simulations were made for the construction schemes with the different excavation methods and for the different reinforcement ranges of the surrounding strata by using the analysis software with FLAC3D three-dimensional fast Lagrangian method according to the engineering characteristics of new tunnel under-passing the existing metro station at short range for the purposes of knowing the characteristics and laws of the existing station's track settlement and structure stress and the new tunnel's surrounding deformation and structure bearing load.
Research conclusions: (1) From the analysis and comparison of the calculations results of the excavation processes obtained by using method, the track the full section method, the bench method and CRD method, it is concluded by using the CRD deformation and structure bearing load of the existing station can be effectively controlled.(2)On the base of the analysis of the numerical simulation results of the different reinforcement ranges for the surrounding strata around the new tunnels, it is proposed the grouting reinforcement should be conducted to the soil sandwich layer, the working face layer and the layer within 3.0m range on the left and right sides of the tunnel. (3)This result can provide the reference to the design and construction of the similar tunnel under-passing the existing subway.
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Received: 27 April 2013
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2013, Vol. 30 
