Study on Long Term Warning Value of Super Large Section Tunnel
Liu Tingjin · Chinese Journal of Underground Space and Engineering · 2009
This paper focuses on warning value of super large section tunnel.Long Tou Shan Tunnel was the subject investigated.First,main parameter of warning value was researched based on deformation regularity of adjacent rock of super large section tunnel,and arch crown settlement was decided to be the main parameter of warning value.Then,based on load-structure theory,finite element method was used to analyze the mechanical state values,including lining concrete cracks and yield point of steel bar,in ultimate state.After considering safety factor,warning values of Long Tou Shan Tunnel were decided.The finite element method can not roundly reflect the mechanical state of one tunnel,but it can analyze ultimate state in the worst work condition.