The results of TBM prevention for restriction based on forward investigation method on weak rock

Abstract

The greatest feature of TBM is high-speed construction. However, once it is hit by troubles, such as defective geology, in order for the measure to take great expense and a great term, therefore, it is the important subject of TBM construction how the trouble is prevented. It was thought that excavation of pilot tunnel by TBM of the Kanaya tunnel line headed for Tokyo had a high possibility that thegeology which the weak and brittle rock followed will be expected, and TBM will be restrained in the ground.
This paper describes the actual result of analysis about reflection tomography considered the correlation with TBM data, and construction result of counter force secured type support used for the weak rock and the result which analyzed TBM excavation data.