Abstract：
Based on the Yanshan tunnel underpassing highway on Zhangjiakou-Tangshan railway, it analyzes the characteristics of stratum deformation, mechanical response, energy accumulation and distribution of plastic zone during construction by three- dimensional finite difference. The results indicate: the maximum settlement of highway is less than that specified in specifications, the maximum vertical deformation of surrounding rock is 20 mm and it is 16 mm for the horizontal deformation, the extruded deformation in front of the working face is large with the max. value of 38 mm, it is obvious for the energy density concentration of side wall where is 5m away from the tunnel wall, energy accumulation occurs at the surrounding rock 6m ahead of working face, plastic zones predominantly are located at the front, shoulder, sidewall and foot. Therefore it is suggested the working face be reinforced to guarantee the reinforcement of tunnel foot and shoulder to improve the structure stability.
SU Jiang
.Study on Characteristics of Stratum Deformation Induced by Railway Tunnel Underpassing Existing Highway[J] MODERN TUNNELLING TECHNOLOGY, 2012,V49(1): 89-95
2012, Vol. 49 