Abstract Based on one tunnel project, a 300-meter calculation zone along the tunnel in longitudinal direction was selected, including the fractured zone and affected zone. The calculation zone was discretized by using block elements with 8 nodes and 6 planes. Each tunnel construction stage and state of stresses and deformations of surrounding rocks and lining were simulated and analyzed by three-dimensional elasto-plastic static FEM. Based on the analysis and comparison, it is concluded that the tunnel deformations and the extent of plastic zones in surrounding rocks are larger in fractured zone and the amplification of internal forces in primary support and secondary lining was around 10~30% due to the effect of fractured zone.
Abstract��
Based on one tunnel project, a 300-meter calculation zone along the tunnel in longitudinal direction was selected, including the fractured zone and affected zone. The calculation zone was discretized by using block elements with 8 nodes and 6 planes. Each tunnel construction stage and state of stresses and deformations of surrounding rocks and lining were simulated and analyzed by three-dimensional elasto-plastic static FEM. Based on the analysis and comparison, it is concluded that the tunnel deformations and the extent of plastic zones in surrounding rocks are larger in fractured zone and the amplification of internal forces in primary support and secondary lining was around 10~30% due to the effect of fractured zone.
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