In-situ Rockmass Test and Numerical Simulation of Basalt Waste Isolation Project in Handford
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Abstract
As the hard bedrock sites decreases gradually, the nuclear safety related structures of NPP has been demonstrating the foundation suitability of the weathered rock, half-diagenesis rock, sedimentary rock and the shallow buried basaltic bedrock under the wide quaternary overburden layer of costal plain, but there are few recent research on basaltic foundation suitability which columnar joints well developed. In this investigation we analyzed the in-situ colmunar basaltic rockmass test and numerical simulation results of Basalt Waste Isolation Project(BWIP) in Hardford, then used the three-dimensional discrete element software 3DEC and Voronoi diagrams to calculate the deformation modulus of irregular colmunar basaltic rockmass. The results shown that the numerical simulation coincide better with the in-situ rockmass test which the numerical solution of the deformation modulus parallel to the axial direction of BWIP is 20.19 GPa while the in-situ rockmass test result is 20 GPa. This work provide some guidance for further numerical simulation on foundation suitability of colmunar basaltic rockmass which can be applicated into the sitting of NPP and disposal repository.
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