Excavation data such as the cutter torque and thrust that shows excavation condition in TBM execution, able to be acquired to a real time. Rational tunnel execution is able to be materialized , by establishing an estimation method of face geological condition by using these data. Many research reports such as the selection of the support pattern and estimation of face geological condition that used TBM excavation data heretofore, are observed . However, excavation data change largely by

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... of rock and degree of crack and degree of fracture etc., the application is in difficult situation . In this report, it shows the result that carried out analysis about correlation relation between TBM excavation data and geological condition and also stability evaluation point, in an execution case of the rock mass that is composed of many crack andesite and cracking to comparatively a few tuff breccia.