## Abstract

In this paper, we present an evaluation method for the strength of a discontinuous rock mass considering the critical strain of the intact rock. This method, which incorporates a weak layer model that describes the mechanical behavior of cracks, is based on a mathematical homogenization theory. The basic idea of this method is that the failure criterion for the rock mass is estimated by the critical strain of the intact rock. To express the critical strain under the state of three dimensions, the evaluation equation for the critical strain, which has conventionally been expressed by the axial strain, is transformed to an equation for the critical strain which is represented by the second invariant of the deviator strain. The strength of the rock mass is evaluated by numerical tests that use a localization process through a homogenization theory. Localization is a process that calculates the macroscopic stress as the response of the model to the forced macroscopic strain. A numerical analysis of in situ rock mass tests for a discontinuous rock mass was carried out using this method. The shear strength conformed to the strength obtained by the in situ tests, and therefore, this method can be used to evaluate the strength of a rock mass.

Original language | English |
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Publication status | Published - 2009 |

Event | 43rd U.S. Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium - Asheville, NC, United States Duration: 2009 Jun 28 → 2009 Jul 1 |

### Conference

Conference | 43rd U.S. Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium |
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Country/Territory | United States |

City | Asheville, NC |

Period | 09/6/28 → 09/7/1 |