›› 2010, Vol. 31 ›› Issue (S1): 363-369.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on interaction mechanism of tunnel-type anchorage with undercrossing tunnel for suspension bridge

LI Gao-hui 1, 2，WU Cong-shi2，DENG Long-bo1，WEI Xiao-yang1，LI Chen1   

  1. 1. Nanning Rail Transit Co., Ltd., Nanning 530021, China; 2. Department of Geotechnical and Tunnel Engineering, Changsha University of Science and Technology, Changsha 410076, China
  • Received:2010-04-24 Online:2010-08-10 Published:2010-09-09

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Abstract:

Based on engineering practice in tunnel-type anchorage for Aizhai suspension bridge,the interaction mechanism of tunnel-type anchorage with undercrossing tunnel were obtained by numerical analysis in MIDAS/GTS.The results show that asymmetry interaction exists between tunnel-type anchorage and undercrossing tunnel in excavation stage; namely, the effects which tunnel-type anchorage acting on undercrossing tunnel is more significantly than its back face. In addition, the nodal displacements nearby the anchorages was changed obviously by the undercrossing tunnel; and in consequence,the vertical displacement curve of tunnel-type anchorage occurred sinking and rotating but there is some limited influence on the horizontal displacement; the vertical extra displacement can reach 0.76 mm because of the undercrossing tunnel. Finally, it is found that the blasting vibration which caused by development blasting of the undercrossing tunnel is weak in view of the tunnel-type anchorage, the vibration velocity less than 2 cm/s when the blast center distance exceeds 40 m; it is anastomosed with the measured data, the monitoring data show that the vibration effect is negligible to the tunnel-type anchorage when the blast center distance exceeds 40 m.

Key words: tunnel-type anchorage, undercrossing tunnel, interaction mechanism, numerical analysis

CLC Number: 

  • TU 443
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