ABSTRACT

For safe and efficient tunnel excavation, it is important to accurately predict the geological conditions ahead of the tunnel face. The authors have proposed Comprehensive System for forward Prediction of Geological Conditions by combining the following methods: “TSP (Tunnel Seismic Prediction) system”, “Reflection tomography”, “Drill logging”, “Velocity logging”, and “Face image processing system”.

This paper presents the features of the proposed system. The authors carried out performance tests by applying this system to an actual tunnel, and verified that this system is useful for practical investigation and evaluation of geological condition.