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| STUDY OF DEFORMATION CHARACTERISTICS OF COMPOUND SUPPORT STEEL ARCH AND SURROUNDING ROCK STABILITY IN DIVERSION TUNNEL |
| WANG Kezhong1，LIU Yaoru2，WANG Yupei1，LIN Feng1，YU Changyang1 |
(1. School of Civil Engineering and Architecture，Zhejiang University of Technology，Hangzhou，Zhejiang 310014，China；
2. State Key Laboratory of Hydrosciences and Engineering，Tsinghua University，Beijing 100084，China) |
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Abstract To study the deformation characteristics and mechanism of compound support steel arch，optimize the support parameters and ensure the stability of diversion tunnel，the tunnel construction in Shanxi water diversion project is simulated numerically based on the mechanical analysis of the support structure. According to the action mechanism of the compound support，the stress and deformation characteristics of steel arch during primary supporting are analyzed. Combined with field project，the pressures that surrounding rock act on steel arch，reinforcing mesh and shotcrete are calculated，and the shared ratio of pressure for every kind of support is given. The numerical calculation shows that，the compound support with steel arch，compared with conventional shotcrete support，can provide direct resistance to surrounding rocks；and the primary deformation and plastic zones of surrounding rocks can be reduced significantly. This will facilitate the formation of rock arch and increase the bearing capacity of compound support；meanwhile，the deformation and stress of the support materials can be reduced greatly. The research results provide theoretical basis for support design of the diversion tunnel for the Yellow River diversion project in the middle part of Shanxi province. This is an effective support method for fractured surrounding rocks；and they also have important reference and guiding significance for similar tunnels.
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Received: 17 April 2013
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2014, Vol. 33 
