Most of infrastructure projects around the
world have to focus on a clear understanding of geological model which may be
determined from various sources of information. The limitation in geotechnical
data and budget affects the accuracy of the geological model, particularly for projects of
long and deep tunnel of which accessibility to the excavation points is
difficult and far reaching. Therefore, an approach adopted for interpretation
plays an important role in the level of uncertainty of the derived
geological model. This paper focuses on the determination of the geological
models at the site of a long water diversion tunnel project in a complex
geologic setting in northern Thailand from an approach to understand the
relationship between regional tectonic setting and local tectonic condition so
that geological structures and rock mass conditions along the tunnel
alignment can be assessed for a better planning of tunnel design and construction.
The paper describes tectonic settings at regional scale (Northern Thailand and Eastern
Myanmar), tectonic features and geologic condition in project area,
geotechnical investigation and data along tunnel alignment and predicted tunnel
ground behavior.
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