Hard rock excavation at the CSM/OCRD test site using Swedish blast design techniques

Technical Report · Thu Sep 01 04:00:00 EDT 1983

OSTI ID:5475198

Holmberg, R

This report is the third in a series describing research conducted by the Colorado School of Mines for the Office of Crystalline Repository Development (OCRD) to determine the extent of blast damage in rock surrounding an underground opening. A special room, called the CSM/OCRD room, was excavated at the CSM experimental mine for the purpose of assessing blast damage in the rock around the room. Even though this mine is not proposed as a nuclear waste repository site, the instrumentation and methods of blast damage assessment developed in this project are applicable to proposed repository sites. This report describes the application of Swedish blasting technology for the excavation of the test room. The design of the blasting patterns including the selection of explosives, hole sizes and location, explosive loading densities, and delay intervals is based upon the theories of Langefors and Kihlstrom in combination with methods used at the Swedish Detonic Research Foundation for minimizing unwanted rock damage. The practical application of the design procedures to seven rounds and the achieved results is discussed.

• Research Organization: Colorado School of Mines, Golden (USA). Dept. of Geological Engineering
• DOE Contract Number: AC02-83CH10140
• OSTI ID: 5475198
• Report Number(s): BMI/OCRD-4(3); ON: DE84003830
• Country of Publication: United States
• Language: English

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