Abstract
This paper describes research on a consultation system to cope with landslides and other problems which often occur during the construction of a tunnel portal by grasping the problems involved in the construction of the portal and assisting the study of suitable measures to be taken. This system is designed not only to assist the operations of trained engineers but also to aid even relatively inexperienced engineers to foresee in advance the dangers of a portal site so that the necessary measures can be prepared, and also enables the expeditious preparation of detailed study reports. Also, in consideration of the fact that past experience is of great importance in this type of problem, a dialogue format was adopted so that the process of study at all times clearly draws from this experience.
