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Survey of the Geology and Geological Structure of the Foundations at a Construction Site for Tram  

Lee, Byung-Joo (Geologic Environment Div., Korea Institute of Geoscience and Mineral Resources)
SunWoo, Chun (Geologic Environment Div., Korea Institute of Geoscience and Mineral Resources)
Chae, Byung-Gon (Geologic Environment Div., Korea Institute of Geoscience and Mineral Resources)
Publication Information
The Journal of Engineering Geology / v.20, no.3, 2010 , pp. 329-338 More about this Journal
Abstract
The foundation area for tram contains biotite gneiss, quartzo-feldspathic gneiss, calc-silicate rock, and porphyroblastic gneiss of the pre-Cambrian Kyeonggi gneiss complex. These rocks record at least three stages of deformation, as indicated by fold sets of contrasting orientations (D1-D3). Joints are generally steeply dipping and strike NW-SE to WNW-ESE. The Gonjiam Fault, which strikes WNW-ESE, follows a river in the area. The fault possesses a 3-m-wide fracture zone, a 10-m-wide damage zone, and is 15 km long. Two tunnels have been constructed through the biotite gneiss. The geometric relationship between discontinuities (e.g., joints and foliation) and tunneling direction reveals that set 3 of the AA tunnel is unstable but that BB tunnel is relatively safe.
Keywords
Kyeonggi gneiss complex; Structural domain; Folding; Foundation survey;
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