A STUDY ON BEHAVIOR OF VERTICAL PRE-REINFORCED BOLT BASES ON FIELD MEASUREMENT IN THE SHALLOW TUNNEL

概要

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The vertical pre-reinforced method has widely been applied to prevention of the surface settlement in the shallow depth tunnel and landslide prevention at the portal area. However, the design of vertical pre-reinforced method based on the experience in respect of the equivalence force between ground. Movement and rock bolt. It is not a method for sufficiently evaluating the stiffening effect to protect a ground settlement a land slide. The authors carried out the detailed field measurement at the tunneling site applied the vertical pre-reinforced method during construction to estimate the support mechanism by the vertical pre-reinforced method. As the result, the vertical pre-reinforced bolt behaved an axis reinforcement model to assist the ground arch of the ground by tunnel excavation. As the result, the load of tunnel excavation is effectively distribute in the front and side of the tunnel face by its reinforcement. This ground reinforcement. Model by using vertical pre-reinforced bolt has established by evaluating the result of field measurements.
社団法人　土木学会の論文