OPTIMIZATION OF CYCLIC FOOTAGE PARAMETERS FOR TUNNELS WITH LARGE DEFORMATION IN WEAK SURROUNDING ROCKS
With the further improvement of the railway network in China,it is inevitable to build a tunnel in poor geological conditions and large deformation risk area.This paper based on a large deformation tunnel with weak sur-rounding rock,the existing construction methods of large deformation tunnel with weak surrounding rock are ana-lyzed and compared.The Center Diaphragm method is used in combination with the characteristics of this tunnel.To optimize the construction parameter values,the FLAC3D software is used to determine the single cyclical footage of Center Diaphragm method.According to the results of the analysis,single cyclical footage value shows significant in-fluence on the deformation of this tunnel,and the reasonable value is determined to be one meter.
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万方数据
