 
Learning Objectives
Introduction
Issues
and Challenges
Locating Roads, Landings
and Quarries
Constructing Roads,
Landings and Quarries
Maintaining Roads
Deactivating and Rehabilitating Roads
Self-check
Karst
Management Handbook for
British Columbia |
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Issues and Challenges
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Figure 6-1: Caves
with thin ceilings are caves where the depth of the overlying
bedrock is less
than three
times
the width
of the cave passage. |
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What are some of the management issues associated with road building?
- Preventing damage to surface and subsurface karst features
- Minimizing soil erosion and sediment/debris transfer into
underground drainage systems and subterranean karst habitats
- Maintaining natural surface and subsurface drainage patterns
- Maintaining surface and subsurface water quality and quantity
- Avoiding caves
with thin ceilings (see Figure 6-1)
- Inadvertently intercepting subsurface conduits or caves through
road and quarry development
- Preventing damage to surface karst features and cave
decorations through blasting and/or vibrations from falling timber and
hauling heavy loads
- Disturbing cave-dwelling fauna (e.g., bats) through blasting,
construction, or hauling
- Controlling public access to surface karst features and caves.
What are some of the engineering challenges associated with road
building?
- Ground surface instability
- Highly irregular bedrock topography beneath the overburden which can lead to unpredictable foundation depths
- Road subsidence,
collapse, or washout due to sinkhole development
- Deep openings or shafts in the bedrock
- Near-surface cavities and caves with thin ceilings
(see
Figure 6-1).
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