Geotechnical characterization and performance assessment of bentonite/sand mixtures for underground waste repository sealing
Source abstract
Abstract
The objective of this study is to assess the performance of a bentonite/sand mixture for the sealing of underground waste repositories through performing geotechnical laboratory tests such as compaction and flow tests. Swelling, mechanical and shear strength tests along with analyses of seal/rock mechanical interactions of an axially loaded seal in rock have been conducted to recommend an optimum compacted bentonite/sand mixture and a suitable bentonite/sand seal length-to-radius ratio (L/a) as a function of water load. The bentonite used in this study was a natural sodium based non-treated bentonite possessing a high swelling potential and containing at least 90% montmorillonite. The results of the compaction permeameter tests led to a recommendation to select a mixture with a bentonite content of about 30% since it possessed the lowest hydraulic conductivity. Analysis of seal/rock mechanical interaction to reduce the possibility of seal slip was performed as a function of the axial load generated from a water column on the seal for seal length-to-radius ratios (L/a) ranging from 2.0 to 20.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Landfill Environmental Impact Studies · Grouting, Rheology, and Soil Mechanics · Soil and Unsaturated Flow
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
Show source-provided references
1. Shear strength of cement-grout borehole plug
2. Bond strength of cementitious borehole plugs in welded tuff
3. Design implications of analytical and laboratory studies of permanent abandonment plugs10.1139/t98-089 ↗
4. Evaluation of a compacted bentonite/sand seal for underground waste repository isolation10.1007/s00254-006-0212-6 ↗
5. 2000
6. ASTM D 698-07 e1. Standard test methods for laboratory compaction characteristics of soil using standard effort (12 400ft-lbf/ft3 (600kN-m/m3)). Annual Book of ASTM Standards, Section 4, Vol. 04.08, Soil and Rock (I), ASTM, West Conshohocken, PA.
7. ASTM D 854-06 e1. Standard test methods for specific gravity of soil solids by water pycnometer. Annual Book of ASTM Standards, Section 4, Vol. 04.08, Soil and Rock (I), ASTM, West Conshohocken, PA.
8. ASTM D 2166-06. Standard test method for unconfined compressive strength of cohesive soil. Annual Book of ASTM Standards, Section 4, Vol. 04.08, Soil and Rock (I), ASTM, West Conshohocken, PA.
9. ASTM D 4318-05. Standard test methods for liquid limit, plasticity limit, and plasticity index of soils. Annual Book of ASTM Standards, Section 4, Vol. 04.08, Soil and Rock (I), ASTM, West Conshohocken, PA.
10. ASTM D 4546-08. Standard test methods for one-dimensional swell or settlement potential of cohesive soils. Annual Book of ASTM Standards, Section 4, Vol. 04.08, Soil and Rock (I), ASTM, West Conshohocken, PA.
11. ASTM D 5856-07. Standard test method for measurement of hydraulic conductivity of porous material using a rigid-wall, compaction-mold permeameter. Annual Book of ASTM Standards, Section 4, Vol. 04.08, Soil and Rock (I), ASTM, West Conshohocken, PA.
12. ASTM D 6528-07. Standard test method for consolidated undrained direct simple shear testing of cohesive soils. Annual Book of ASTM Standards, Section 4, Vol. 04.08, Soil and Rock (I), ASTM, West Conshohocken, PA.
13. Sand-bentonite liners: predicting permeability from laboratory tests10.1139/t90-005 ↗
14. Choice of French clays as engineered barrier components for waste disposal
15. Daemen · 1996
16. Water content-density criteria for compacted soil liners10.1061/(ASCE)0733-9410(1990)116:12(1811) ↗
17. A study of the compaction properties of potential clay–sand buffer mixtures for use in nuclear fuel waste disposal10.1016/0013-7952(85)90015-8 ↗
18. Demirtaşlı · 1985
19. 1985
20. Tunnel bulkheads for acid mine drainage
21. 1992
22. 1996
23. State-of-the-art evaluation of repository sealing materials and techniques
24. Halliburton Services, Undated. Cement plug studies. Halliburton Cement, Halliburton Services, A Halliburton Company, Houston, Texas.
25. Hoffman · 2004
26. Stress distributions in rock anchors10.1139/t71-060 ↗
27. Sealing of underground repositories for radioactive wastes
28. 2009
29. Hydraulic conductivity of compacted bentonite–sand mixtures10.1139/t92-042 ↗
30. Simplified evaluation on hydraulic conductivities of sand–bentonite mixture backfill10.1016/j.clay.2003.09.006 ↗
31. In situ performance of a clay based barrier
32. The permeability of compacted bentonite fine-grained soils
33. Environmental geological and geotechnical investigations related to the potential use of Ankara clay as a compacted landfill liner material, Turkey10.1007/s00254-004-1147-4 ↗
34. Akkuyu II (Çamalanı) Nuclear Power Plant geological and geotechnical investigations
35. Performance of bentonite and bentonite/crushed rock borehole seals
36. Sodium bentonite as a borehole sealant
37. Tunnel plugs in recent H.E.C. Practice
38. Small-scale bentonite injection test on rock
39. Borehole sealing for underground waste storage10.1061/(ASCE)0733-9410(1983)109:1(113) ↗
40. Waste disposal in rock
41. Identification of susceptible soils and control of tunnelling failure in small earth dams
42. Hydraulic conductivity of bentonite–sand mixtures10.1139/t99-120 ↗
43. Piping in earth dams of dispersive clay
44. Waste isolation pilot plant sealing system design report. DOE/WIPP-95-3117
45. Environmental radiation protection standards for management and disposal of spent nuclear fuel, high-level and transuranic radioactive wastes
46. Disposal of high-level radioactive wastes in geologic repositories
47. Disposal of high-level radioactive wastes in geologic repositories, Final rule, unsaturated zone amendment
48. Formulation of backfill material for a nuclear fuel waste disposal vault10.1139/t86-031 ↗
49. Wyllie · 1999