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The lower portion of the Quebec North Shore and Labrador Railway, constructed between 1950 and 1954, is located on side-hill, cut-and-fill sectionsin water-deposited, banded sediments which now occupy terrace-like positions along the Moisie River.
These sediments have a natural water content above the liquid limit and are therefore sensitive to remolding. They are generally stiff and fissured but soft strata and sand partings are not uncommon. Stratification is not always horizontal and slope stability is often impaired by the presence of perched water tables in overlying deposits of sand and gravel.
Failures have occurred in cut and embankment slopes both during and after construction and prompted the large-scale program of exploration and testing which was initiated in 1955 and continued in 1956.
This paper presents a summary of the exploration programs which involved a total of 11,000 ft of boring and sampling at 126 locations. The results of the program of sampling and testing have been of importance in establishing priorities for the completion of corrective measures to improve the stability of cut slopes in the most vulnerable locations and in suggesting future programs of exploration and research.
Soils Engineer, Quebec North Shore and Labrador Railway Co., Quebec,
ConsultantHead, Quebec North Shore and Labrador Railway Co.School of Civil Engineering, Purdue University, Lafayette, Ind.