Progressive Damage of a Canadian Granite in Laboratory Compression Tests and Underground Excavations

Minerals

ThanhSon Nguyen¹ 

[1] Canadian Nuclear Safety Commission (CNSC), Ottawa, ON K1P 5S9, Canada;

关键词: nuclear waste disposal;    brittle rock;    granite;    hydro-mechanical coupling;    plasticity;    damage;   

DOI  :  10.3390/min11010010

来源: DOAJ

【 摘 要 】

The crystalline rock formations of the Canadian Shield are currently one candidate rock type for the geological disposal of radioactive waste in Canada. This article starts with a critical review of past research results on the geomechanical behaviour of Lac du Bonnet granite, a rock type found at an Underground Research Laboratory (URL) in Pinawa, Manitoba, Canada. Based on the published data, a constitutive model was developed, based on Mohr-Coulomb plasticity, which includes the concept of asynchronous degradation of cohesion and mobilization of friction with progressive damage, as well as time-dependent degradation of strength. The constitutive model was used to simulate laboratory compression tests. It was then implemented in a coupled hydro-mechanical model to simulate the response of the rock mass induced by excavation of a test tunnel at 420 m depth at the URL.

【 授权许可】

Unknown