Bulletin (1910) (14576667767) - Public domain book illustration

Identifier: bulletin86unit (find matches)

Title: Bulletin

Year: 1910 (1910s)

Authors: United States. Bureau of Mines

Subjects: Mines and mineral resources Mines and mineral resources Mining engineering

Publisher: Washington U.S. Govt. Print. Off. (etc.)

Contributing Library: Gerstein - University of Toronto

Digitizing Sponsor: University of Toronto

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SLIDES. 49 they were somewhat troublesome. They nave made necessary theexcavation of about 30,000,000 cubic yards more than weis includedin the first estimates for Culebra Cut, but they have not in the pastand will not in the future endanger the ultimate success of the canal.Because of their importance as a factor in canal construction theyare discussed in considerable detail. ANALYSIS OF CONDITIONS LEADING TO SLIDES. The following information, with accompanying illustrations, haslargely been given by the author m a paper ^ read before the TwelfthInternational Congi*ess at Toronto, Canada. Any excavation in the earths crust sets up stresses in the con-tiguous rocks, because of the unbalanced pressures created by thesubstitution of atmospheric pressure for the greater pressure of thematerial excavated. These stresses are divisible into two distinctgroups, as follows: (a) Crushing or direct gravity stresses, which havea maximum effect near the toe of the steep slope of the excavation;an

Bulletin des United States Bureau of Mines 1910 Buchillustrationen Maschinenbau Minen und Bodenschätze Geologie Bilder aus dem Internetarchiv Kanada

1910

University of Toronto

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public domain