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A Numerical Study on the Fracture Evolution and Damage at Rock Pillar Near Deposition Holes for Radioactive Waste  

이희석 (SK건설(주) Geotask팀)
Publication Information
Journal of the Korean Geotechnical Society / v.19, no.5, 2003 , pp. 211-221 More about this Journal
Abstract
At Aspo hard rock laboratory in Sweden, an in-situ heater experiment called "$\"{A}"{s}"{p}"{o}$ Pillar Stability Experiment (APSE)" is prepared to assess capability to predict spatting and stability in a rock mass between deposition holes for radioactive waste. To Predict reasonably fracturing process at rock pillar under a planned configuration before testing, a boundary element code FRACOD has been applied for modelling. The code has been improved to simulate explicitly fracture evolution both at rock boundaries and in intact rocks. A new inverse stress reconstruction technique using boundary element has been also developed to transfer stress field by excavation and thermal loading into the FRACOD model. This article presents the results from predictive modelling far the planned in-situ test condition. Excavation induced stresses might cause slight fracturing in the pillar walls. Typical shear fractures have been initiated and propagated near central pillar walls during 120 days of heating, but overall rock mass remained stable under the considered configuration. The effects of pre-existing joints and properties of fractures are also discussed. It is found from the results that FRACOD can properly model essential rock spatting and propagation at deep tunnels and boreholes.at deep tunnels and boreholes.
Keywords
Boundary element method; Fracture initiation; Fracture propagation; Inverse technique; Rock fracture; Rock pillar; Spalling;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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