Geological information acquisition

geophysical prediction and data interpretation are three major links of tunnel geological prediction. In this article the methods of geological logging were firstly discussed

including tunnel risk classification

geological sketching on tunnel face

then the geological plane map was plotted and the three-dimensional geological model was built. The location of the defective geological karst-fractured groundwater in adjacent tunnel could be calculated from the geological model Based on this situation the key issues of instruments were discussed in detail

and developed the tunnel geological prediction automatic selection system

which could help the operators choose proper methods for zones with different rock characters

structure development characters and underground hydrological features

and make suggestion for special geological zones. At last the criterions on data analysis of staple prediction methods of typical adverse geological bodies were given

which had a certain reference to tunnel advanced geological prediction.