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| Research on the Calculation Method of Composite Lining Internal Force for Railway Tunnel |
| SONG Yu-xiang，LIU Yong，QI Jian-xu |
| (Shijiazhuang Tiedao Unversity，Shijiazhuang，Hebei 050043，China ) |
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Abstract Research purposes:With the popularization of NATM，more and more tunnel use composite lining. At present，the calculation method consists of action-reaction model and continuum model. Elastic resistance is simulated by spring in action-reaction model，which can not reflect interaction between surrounding-rock and support structure. There are some empirical of continuum model in releasing rate problem. This paper from the perspective of composite lining to calculated initial supports and second lining of composite lining in the model that load acts on the strata boundary，and compared with the calculate results of traditional load structure method.
Research conclusions:(1)By comparing the advantages and disadvantages with action-reaction model and continuum model，common model is put forward which are uniformly applied instead of surrounding rock around the load pressure. At the same time，the displacement of support structure can be suppressed by the deformation of surrounding rock， which fully reflects interaction and deformation coordination between surrounding rock and structure. (2)Internal force is analyzed using common model in complex lining of railway tunnel，the results were compared with the results of action- reaction method，the results explain that the common model is more in accord with the theory of NATM，reducing the computing time greatly while considering the interaction of surrounding rock.
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Received: 28 June 2015
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2015, Vol. 32 
