Physical Properties and the Mechanics of Penetration and Loading of Bulk Materials as Related to Rapid Excavation
Annual technical rept. 1 Feb-31 Dec 1971
BUREAU OF MINES PITTSBURGH PA PITTSBURGH MINING AND SAFETY RESEARCH CENTER
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Basic physical properties tests on 38 samples from tunneling and mining sites were completed. Designing and constructing a curved path penetration and loading apparatus has been accomplished. Linear penetration tests were run using both confined and unconfined materials. Confined tests were performed with bulk material in the loose state and then on a vibratory compacted state. Compaction was found to be the most important variable. Digging and loading tests indicated the tremendous energy required for the initial digging process compared to the loading process. Load cells were installed on the walls of the containers to measure the force transmitted to the walls during penetration tests. A finite element computer program was completed.
- Mining Engineering
- Civil Engineering