The fracture of rock is influenced by the development of an intrinsic process zone in the form of a localized region of microcracking. This zone has a fundamental importance for defining the system behavior in terms of the post-peak instability and in terms of material strength such that size effects appear. This paper illustrates the change in the load-displacement response and presents evidence of the process-zone development with varying specimen size. It is demonstrated that fracture problems do not require geometric or material nonlinearity to produce instability. The size of a structure that fails by fracture is an important factor. Furthermore, experiments suggest that an intrinsic zone develops in rock as a material characteristic. Because of this intrinsic length, two competing factors define the nominal strength-the positive contribution of the process zone and the depleting aspects of the undamaged volume, that is, the size.
|Original language||English (US)|
|Title of host publication||Vail Rocks 1999 - 37th U.S. Symposium on Rock Mechanics (USRMS)|
|Editors||Kranz, Smeallie, Scott, Amadei|
|Publisher||American Rock Mechanics Association (ARMA)|
|Number of pages||7|
|ISBN (Print)||9058090523, 9789058090522|
|State||Published - 1999|
|Event||37th U.S. Symposium on Rock Mechanics, Vail Rocks 1999 - Vail, United States|
Duration: Jun 7 1999 → Jun 9 1999
|Name||Vail Rocks 1999 - 37th U.S. Symposium on Rock Mechanics (USRMS)|
|Other||37th U.S. Symposium on Rock Mechanics, Vail Rocks 1999|
|Period||6/7/99 → 6/9/99|
Bibliographical noteFunding Information:
Partial support was provided by the National Science Foundation Grant Number CMS-9532061 and the North Atlantic Treaty Organization Collaborative Research Grant Number 950695.