Burial trench dynamic compaction demonstration at a humid site
This task has the objective of determining the degree of consolidation which can be achieved by dynamic compaction of a closed burial trench within a cohesive soil formation. A seven-year-old burial trench in Solid Waste Storage Area (SWSA) 6 of Oak Ridge National Laboratory (ORNL) was selected for this demonstration. This 251 m/sup 3/ trench contained about 80 Ci of mixed radionuclides, mostly /sup 90/Sr, in 25 m/sup 3/ of waste consisting of contaminated equipment, dry solids, and demolition debris. Prior to compaction, a total trench void space of 79 m/sup 3/ was measured by pumping the trench full of water with corrections for seepage. Additional pre-compaction characterization included trench cap bulk density (1.68 kg/L), trench cap permeability (3 x 10/sup -7/ m/s), and subsurface waste/backfill hydraulic conductivity (>0.01 m/s). Compaction was achieved by repeatedly dropping a 4-ton steel-reinforced concrete cylinder from heights of 4 to 8 m using the whipline of a 70-ton crane. The average trench ground surface was depressed 0.79 m, with some sections over 2 m, yielding a surveyed volumetric depression which totaled to 64% of the measured trench void space. Trench cap (0 to 60 cm) bulk density and permeability were not affected by compaction indicating that the consolidation was largely subsurface. Neither surface nor airborne radioactive contamination were observed during repeated monitoring during the demonstration. Dynamic compaction was shown to be an excellent and inexpensive (i.e., about $20/m/sup 2/) method to collapse trench void space, thereby hastening subsidence and stabilizing the land surface. 15 refs., 10 figs., 3 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6409469
- Report Number(s):
- CONF-8509121-22; ON: DE86003318
- Resource Relation:
- Conference: 7. annual DOE LLWMP participants information meeting, Las Vegas, NV, USA, 10 Sep 1985; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
RADIOACTIVE WASTE DISPOSAL
GROUND SUBSIDENCE
UNDERGROUND DISPOSAL
COMPACTING
DEMONSTRATION PROGRAMS
LOW-LEVEL RADIOACTIVE WASTES
OAK RIDGE RESERVATION
ORNL
STABILIZATION
MANAGEMENT
MATERIALS
NATIONAL ORGANIZATIONS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
US AEC
US DOE
US ERDA
US ORGANIZATIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage