2009•Chinese Journal of Underground Space and EngineeringRequires access
Analysis of Surrounding Rock Pressure of Niuhushan Tunnel Under Unloading Effect
Cao Yun-qiang
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Abstract
Based on the unloading non-linear rock mechanics,using the computation software established on the theory of loading rock mechanics,the Niuhushan tunnel was imitated by more objective three-dimension FEM.So the distribution and the variation reason of surrounding rock stress were analyzed and the distance between the influenced surrounding rock and the excavation plane was studied,and the results are as following: the influence of the excavation of upper bench to the surrounding rock was maximal;and the the left-side arm was smaller,the lower bench was the smallest;the bigger influence scope to the surrounding rock was about 6 meters around the excavation plane,and serious influence region was about 3 meters around the excavation plane.This provides dynamic information for construction work in the future.