Abstract

During the extension of the Hamilton Mountain trunk sewer, instantaneous and long-term movements were monitored in the rock strata containing the excavated trench. Movements as far as 150 m from the trench axis were observed over a period of more than 1 year.Although the movements seem to be continuous and decreasing with time, their spatial distribution and dissipation are not entirely predictable, suggesting the important role of local geological features.Interpretations of the results and recommendations for other work in the region are submitted.

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