A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Finite Element Analysis of a Bentonite-Filled Rock Cavity
This study presents the results of a finite element analysis of the stability of a storage hole filled with compacted bentonite and a storage tunnel filled with a bentonite-sand mixture for a final repository of radioactive waste. The bentonite has swelling properties and the swelling pressure causes additional loading on the wall of the storage hole and tunnel. In this analysis we assume a swelling pressure of 10 MPa for the storage hole with the diameter of 1.5 m and 0.5 MPa for the storage tunnel with the width of 3.7 m and the highth of 4 m. Results of the FEM-analysis at plane strain show stress concentrations in the roof of the tunnel and below the bottom of the storage hole. While the axisymmetrical analysis indicated a more even and homogeneous stress distribution with minor stress concentrations at the bottom of the hole. The Results of analysis in plane strain show that the joints in the vicinity of the storage hole will open up a maximum of 3 mm when the hole is excavated. This is further increased to 13 mm around the top of the hole when the hole is filled with bentonite. Around the bottom of the hole the deformations are calculated to be 5 mm. However, in the real case the displacements will be less due to the confined conditions around the hole. From this study we conclude that the opening of the joints will not exceed some millimeter in the rock mass around the storage hole and the tunnel. (Atomindex citation 10:438330)
Finite Element Analysis of a Bentonite-Filled Rock Cavity
This study presents the results of a finite element analysis of the stability of a storage hole filled with compacted bentonite and a storage tunnel filled with a bentonite-sand mixture for a final repository of radioactive waste. The bentonite has swelling properties and the swelling pressure causes additional loading on the wall of the storage hole and tunnel. In this analysis we assume a swelling pressure of 10 MPa for the storage hole with the diameter of 1.5 m and 0.5 MPa for the storage tunnel with the width of 3.7 m and the highth of 4 m. Results of the FEM-analysis at plane strain show stress concentrations in the roof of the tunnel and below the bottom of the storage hole. While the axisymmetrical analysis indicated a more even and homogeneous stress distribution with minor stress concentrations at the bottom of the hole. The Results of analysis in plane strain show that the joints in the vicinity of the storage hole will open up a maximum of 3 mm when the hole is excavated. This is further increased to 13 mm around the top of the hole when the hole is filled with bentonite. Around the bottom of the hole the deformations are calculated to be 5 mm. However, in the real case the displacements will be less due to the confined conditions around the hole. From this study we conclude that the opening of the joints will not exceed some millimeter in the rock mass around the storage hole and the tunnel. (Atomindex citation 10:438330)
Finite Element Analysis of a Bentonite-Filled Rock Cavity
O. Stephansson (author) / K. Maeki (author) / T. Groth (author) / P. Jonasson (author)
1978
74 pages
Report
No indication
English
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