节理岩体中隧道围岩变形特征分析

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Abstract Jinjishan Tunnel is the first multi-arch tunnel with bidirectional eight-lane in China. There were developed joints and crushed rock in tunnel surrounding rock，and the characteristics of joint distribution has significant effect on the stability of tunnel surrounding rock. The data of joints in several cross-sections of mid-drift and other outcrop areas of the tunnel are collected，and joints distribution of the main tunnel by using statistical analysis method is predicted. On the basis of this，simulation calculation for the deformation process of Jingjishan tunnel surrounding rock is made with the self-programmed computation program of analyzing initiation，extending and connecting of rock fractures，and the simulation results show that affections of two joints distribution features on surrounding deformation and the displacement of tunnel surrounding rock be dominated by vertical displacement，and the maximum displacement is at the lateral arch shoulder. The results provide the basis for strengthen and construction methods of tunnel.

Key words： tunnel engineering multiple-arch tunnel jointed rock mass discontinuous deformation analysis displacement analysis

Received: 11 April 2011

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/Is2/3566

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