Abstract
Abstract This paper summarises a study on pillar spalling using fracture propagation code FRACOD. The rock mass response in a heated pillar between two large boreholes in the planned Äspö Pillar Stability Experiment by SKB is modelled. To model all the planned loading phases, the code has been improved in many ways. Today it predicts the explicit fracturing process including fracture initiation. Barton-Bandis model has been applied to estimate the fracture properties for newly initiated fractures. It also simulates the development of Acoustic Emission (AE) events. A stress reconstruction technique has been developed to transfer excavation and heat induced stresses from other models into FRACOD The modelling results suggest that the excavation induced stresses will cause slight fracturing in the pillar walls. Fracture propagation driven by thermal loading may lead to minor spalling
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