Open Access
Table 1
Geotechnical considerations in UWV design.
| Geologic attribute | Geotechnical issues | Possible impacts on Underground Wood Vault (UWV) durability | Assessment criteria |
|---|---|---|---|
| 1. Hydrology | A. Proximity to surface water | Water infiltration from above | Surface water flow patterns |
| Annual and seasonal precipitation | |||
| B. Proximity to groundwater | Water incursion from below | Aquifer locations (vertical and lateral) | |
| Aquifer recharge and discharge dynamics | |||
| C. Predictability of water movement | Water environment cannot be reliably modelled | Multi-decadal records of precipitation and water-well productivity | |
| 2. Lithology | A. Permeability | Materials do (or do not) allow interstitial water or gas flow | Soil composition and texture |
| Bedrock composition and texture | |||
| B. Hydraulic conductivity | Materials do (or do not) minimize flow-penetration rates by water | Hydraulic conductivity values for all materials | |
| C. Plasticity | Materials do (or do not) display selfhealing properties during wet/dry cycles | Liquid limit and plasticity index values for all materials | |
| D. Sorption capacity | Materials do (or do not) tend to immobilize water or GHG through sorption | Mineral composition, especially abundance of expandable phyllosilicates | |
| 3. Seismicity | A. Peak Ground Acceleration (PGA) from shock waves | Shock waves do (or do not) occur frequently | PGA model for 50-year or longer timescale |
| Shock waves do (or do not) occur strongly | Wave-amplification potential implied by lithology | ||
| B. Peak Ground Displacement (PGD) from shock waves | Cap fractures admit water from above or release GHG from below | Mechanical response model for site materials | |
| Sub-surface fractures admit groundwater from below | Geologic evidence for absence of land surface disturbance by earthquake activity |
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