By E. Hoek, Evert. Hoek, John A. Hudson
Floor and Underground undertaking Case Histories
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Extra resources for Comprehensive rock engineering : principles, practice and projects. 5. Surface and underground case histories
In addition, the borehole itself is often studied by various methods.
Educational uses and research uses include such examples as the Civil and Mineral Engineering Building at the University of Minnesota which is a 15 000 m building housing classrooms, offices and research laboratories. Part of the building is a cut-and-cover building in soil but approximately 2000 m was mined from two vertical shafts in a soft sandstone at a depth of 25 to 35 m below ground level (Figure 11). The building was named the Outstanding Civil Engineering Achievement of 1983 in the USA.
4 Drilling Holes for Detailed Information Boreholes provide more-detailed information than many other methods of investigation, but this stage is considerably more expensive because heavy equipment is needed and the work is time consuming. Drilling is carried out by several methods, from simple probe holes, in which the speed of drilling is recorded and the rock material is investigated by studying the drill cuttings, to core drilling, in which a cylinder of rock cut out by diamond drill bits is brought to the surface for analysis.
Comprehensive rock engineering : principles, practice and projects. 5. Surface and underground case histories by E. Hoek, Evert. Hoek, John A. Hudson