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Experimental Hall 3D deformation analysis Asian Region Design CONVENTIONAL FACILITIES AND SITING

Experimental Hall 3D deformation analysis Asian Region Design CONVENTIONAL FACILITIES AND SITING. Study 1 : Excavation analysis. Contents. Study 1 : Excavation analysis Evaluate the distribution of loosened zone around E/H TDR designed E/H dimension

abraham-saunders
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Experimental Hall 3D deformation analysis Asian Region Design CONVENTIONAL FACILITIES AND SITING

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  1. Experimental Hall 3D deformation analysis Asian Region Design CONVENTIONAL FACILITIES AND SITING

  2. Study 1 : Excavation analysis Contents Study 1 : Excavation analysis Evaluate the distribution of loosened zone around E/H • TDR designed E/H dimension • Parametric study because rock mass properties and initial ground stress are under now investigation Study 2 : Bedrock displacement installing Detector Evaluate the influence of vertical displacement at E/H bottom floor and surrounding area by push-pulling of detectors • Detectors are heavy but lighter than excavated rock mass weight. • Behavior of displacement is almost elastic. • Total weight of excavated rock mass : 350,000 tons at least • 950m2 x 142m x 2.65 ton/m3= 357,000 tons • Detectors weight : 25,000 tons

  3. Study 1 : Excavation analysis Design of Experimental Hall of Asian site

  4. Study 1 : Excavation analysis Analysis conditions • Analysis method : • 3D Elastic FEM analysis considering excavation step • Deformation modulus at fractured elements reduced to one-100th by every excavation step considering plasticity. • Model size : • H450m x W900 x L900m • Overburden : 200m Z 900m Y X 200m 450m X Y Z

  5. Study 1 : Excavation analysis Assumption of Rockmass properties Deformation modulus for analysis set to three classes “H, M, L” considering candidate site rock condition. Share strength is assumed by relationship between propertiesof previous other granite investigation. Predicted P wave velocity

  6. Study 1 : Excavation analysis Borehole logging test at investigation borehole near E/H site m/sec Ω m2/m P-wave velocity logging Electrical logging Value of electrical resistivity Planned installation depth Spacing electrodes are 0.25-4.0m

  7. Study 1 : Excavation analysis Ground stress • Isotropic case but Anisotropic cases • Horizontal stress is larger than vertical stress in case of candidate site condition by some reports • Desirable for E/H direction and max. principle stress direction are same σz σy σx σx σy σz

  8. Study 1 : Excavation analysis Ground stress test at investigation borehole near E/H site Horizontal stress is larger than vertical stress 1.2-1.8 times Direction N E S W N Ground stress MPa K= σH/σz Longitudinal direction of E/H Depth m Depth m

  9. Loosening around cavern is caused by stress releasing and blasting. Study 1 : Excavation analysis Loosened zone around cavern Definition of loosened zone by stress releasing Loosened zone 1.0 < sf. <1.2 plastic not elastic Fractured zone Sf. < 1.0 Fracturing stress F/S Shear Stress Plastic zone Yield stress Y/S Hard rock case Rock characteristics are almost elastic. Y/S is very near F/S Elastic zone In case of large cavern, loosened area by stress releasing is wider. Shear Strain

  10. Study 1 : Excavation analysis Excavation procedure (Bench program) 1st step Initial stress analysis 2nd step Upper A/T and Arch of E/H 3rd step Lower A/T and Evc/T 25.000 25.000 25.000 25.000 25.000 25.000 4th step Bench of E/H middle part 5th step Arch of alcoves 6th step Bench of E/H bottom part Excavation analysis is by six steps as shown on a figure, to roughly understand the variation of stress and deformation on each step. Actual excavation procedure will be more complicated.

  11. Study 1 : Excavation analysis Excavation procedure (Bench program) 1st step Initial stress analysis 2nd step Upper A/T and Arch of E/H 3rd step Lower A/T and Evc/T 4th step Bench of E/H middle part 5th step Arch of alcoves 6th step Bench of E/H bottom part

  12. Study 1 : Excavation analysis Displacement x:y:z=1:1:1 x:y:z=2:2:1 x:y:z=2:1:1 x:y:z=1:2:1 • In case of stress B and C, side wall displacement will be larger relatively. • Because ground stress of cross section direction is larger. • But displacements in good rock condition are absolutely small in each case. B１ B2 B3 x:y:z=1:1:1 x:y:z=2:2:1 x:y:z=2:1:1 x:y:z=1:2:1 A１ A１ B１ B2 B3

  13. Study 1 : Excavation analysis Distribution of loosened zone x:y:z=1:1:1 x:y:z=2:2:1 x:y:z=2:1:1 x:y:z=1:2:1 Section B3 arch Z x:y:z=1:1:1 x:y:z=2:2:1 x:y:z=2:1:1 x:y:z=1:2:1 Section B3 Side wall x:y:z=1:1:1 x:y:z=2:2:1 x:y:z=2:1:1 x:y:z=1:2:1 Section A1 End wall Y X X Y Z

  14. 1.2m 1.2m 3.6m 4.7m Study 1 : Excavation analysis Loosened zone/ Section A1 / H-class Section A1 Stress-A x:y:z=1:1:1 Section A1 Stress-B x:y:z=2:2:1 Section A1 Stress-D x:y:z=1:2:1 Section A1 Stress-C x:y:z=2:1:1

  15. 1.2m 1.2m 1.6m 6.8m 5.6m Study 1 : Excavation analysis Loosened zone/ Section A1 / M-class Section A1 Stress-A x:y:z=1:1:1 Section A1 Stress-B x:y:z=2:2:1 Section A1 Stress-D x:y:z=1:2:1 Section A1 Stress-C x:y:z=2:1:1

  16. 3.7m 4.9m 1.8m 4.1m 6.6m 8.8m 3.8m 10.8m Study 1 : Excavation analysis Loosened zone/ Section A1 / L-class Section A1 Stress-A x:y:z=1:1:1 Section A1 Stress-B x:y:z=2:2:1 Section A1 Stress-D x:y:z=1:2:1 Section A1 Stress-C x:y:z=2:1:1

  17. 1.2m 1.2m 1.2m 1.2m Study 1 : Excavation analysis Loosened zone / Section B1 / H-class Section B1 Stress A x:y:z=1:1:1 Section B1 Stress B x:y:z=2:2:1 Section B1 Stress C x:y:z=2:1:1 Section B1 Stress D x:y:z=1:2:1

  18. 1.6m 1.6m 1.8m 5.3m 4.7m Study 1 : Excavation analysis Loosened zone / Section B1 / M-class Section B1 Stress A x:y:z=1:1:1 Section B1 Stress B x:y:z=2:2:1 Section B1 Stress C x:y:z=2:1:1 Section B1 Stress D x:y:z=1:2:1

  19. 4.1m 4.1m 4.1m 2.6m 9.4m 6.5m 7.3m 13.4m Study 1 : Excavation analysis Loosened zone / Section B1 / L-class Section B3 Stress A x:y:z=1:1:1 Section B3 Stress B x:y:z=2:2:1 Section B3 Stress C x:y:z=2:1:1 Section B3 Stress D x:y:z=1:2:1

  20. Study 1 : Excavation analysis Loosened zone / Section B3 / H-class Section B3 Stress A x:y:z=1:1:1 Section B3 Stress B x:y:z=2:2:1 Section B3 Stress C x:y:z=2:1:1 Section B3 Stress D x:y:z=1:2:1

  21. 1.2m 1.2m 6.7m 4.9m Study 1 : Excavation analysis Loosened zone / Section B3 / M-class Section B3 Stress A x:y:z=1:1:1 Section B3 Stress B x:y:z=2:2:1 Section B3 Stress C x:y:z=2:1:1 Section B3 Stress D x:y:z=1:2:1

  22. 3.7m 1.8m 4.1m 4.9m 12.4m 7.5m 20.3m 9.4m Study 1 : Excavation analysis Loosened zone / Section B3 / L-class Section B3 Stress A x:y:z=1:1:1 Section B3 Stress B x:y:z=2:2:1 Section B3 Stress C x:y:z=2:1:1 Section B3 Stress D x:y:z=1:2:1

  23. Study 2 : Displacement by Detectors movement Analysis conditions • Estimation of displacement distribution around E/H by installing or push-pulling Detectors. • Rock mass deformation modulus : 5 GPa • Analysis method : 3D Elastic FEM analysis • Displacement is inversely proportional to deformation modulus because of elastic analysis. • Model size : • H450m x W900 x L900m • Overburden : 200m ILD Detector 900m 200m 450m SiD Detector

  24. Study 2 : Displacement by Detectors movement Subject 2：Loading condition (Detector position) Detector ILD or SiD Concrete pallet 20m*20m*t3m Concrete slab t=3m Loading condition LOO Loading condition LOS Loading condition OOS Both off-line ILD installation SiD installation ILD ILD SiD SiD • ILD weight : 15,000 tons • SiD weight : 10,000 tons • Detectors are installed on concrete pallets. • Thickness of concrete pallets are assumed as 3m. • Detector weight are loaded on the pallet as a uniformly-distributed load Loading condition LSO ILD off-line SiD on-line ILD SiD Loading condition OLS ILD on-line SiD oｆｆ-line ILD SiD

  25. Study 2 : Displacement by Detectors movement Base concrete slab displacement by placing detectors Max displacement of ILD is 1.28mm, “OLS” case : ILD online case Max displacement of SiD is 0.84mm, “LSO” case : SiD online case Rock mass Deformation modulus : 5GPa Concrete Young’s modulus :25GPa

  26. Study 2 : Displacement by Detectors movement Displacement distribution of E/H bottom level Deformation modulus : 5GPa

  27. Study 2 : Displacement by Detectors movement Vertical displacement distribution at each level Experimental hall Bottom level displacement is larger Displacement outside E/H is almost same Deformation modulus : 5GPa Experimental hall Top Level YOT BT Level YOB Bottom Level YOO Experimental hall Experimental hall

  28. Study 2 : Displacement by Detectors movement Vertical displacement distribution at each cross section ILD alcove section ILD alcove section Beam line section Beam line section SiD alcove section SiD alcove section

  29. Study 2 : Displacement by Detectors movement Relative displacement between “LSO” and “OLS” at Beamline elevation mm Beam line The area that displacement more than 0.02mm is within around 100m from the beam line. Deformation modulus : 5GPa

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