Face Mapping Tunnel. Reviewing the rock mass rating or other method of rock classification to be used on the site. A face map or tunnel geological map is another important document.
Owing to the nature of the construction work during tunnel drivage access to the face was restricted so it was imperative to develop a quick visual assessment of ground conditions. 3 In medium-hard rock or in more cohesive soil the ground may be strong enough to allow a certain open section at the tunnel face. There are indications of a higher jointing.
Timely access to all of.
Engrg Korea Railroad Research Institute Uiwang Korea 437-757. It shows the geology of the face wall and crown of the tunnel after every excavation. It includes the rock strength rock type an engineering geological map of the tunnel and recommendation for the support class. For open face tunnelling projects digital photographs are taken processed to a 3D image and used subsequently for geological mapping and the measurement of geometrical features as well as for assessing the amount of overbreak.
