ISSN:
1434-453X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Architecture, Civil Engineering, Surveying
,
Geosciences
Notes:
Summary First, Class II behaviour of rock is discussed with a spring model. The model is characterized by non-uniform failure, which agrees qualitatively with common experimental observation, and shows not only class I but also class II behaviour depending on strength variation of springs. Focusing on the difference between class I and class II behaviour in actual rocks, unloading-reloading tests were conducted in the post-failure region. From the test results, it was found that for both class I and class II rocks, the elastic strain tends to decrease in the post-failure region as the loadbearing capacity deteriorates. The results also show that a remarkable difference between class I and class II categories is the magnitude of non-elastic strain. That is, if non-elastic strain increases faster that elastic strain decreases, then rock shows class I behaviour, and in the opposite case class II behaviour. In general, the non-elastic strain increases with confining pressure and in some cases, rock behaviour changes from class II to class 1 at higher confining pressure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01043307
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