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Subsidence and Collapse

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Subsidence and Collapse Learning Objectives: Supplement Understand the types of subsidence and the causes of each type Key controls of subsidence processes, and ... – PowerPoint PPT presentation

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Title: Subsidence and Collapse


1
Subsidence and Collapse
2
Learning Objectives Supplement
  • Understand the types of subsidence and the causes
    of each type
  • Key controls of subsidence processes, and
    mitigation
  • Human effects that promote or mitigate subsidence

3
Terminology
  • Subsidence/collapse
  • Surface depressions resulting from failure of
    rock/soil from deeper(underground) perturbations
    usually associated with material removal by
    natural or human influences.

4
Types of Subsidence
  • Subsidence at or near the surface (Volume
    losses)
  • Withdrawal of fluids
  • Underground Mining
  • Dissolution of limestone or salt deposits

5
Subsidence at or near the surface (Volume losses)
  • Above compressible (fine-grained) sediments
  • Associated with clayey soils
  • Draining or decomposition of organic deposits

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Withdrawal of fluids
  • Groundwater
  • Oil
  • Both

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Underground Mining
  • Material withdrawal (especially coal)
  • Room Pillar mining
  • Longwall mining
  • Mine fires

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Dissolution of Limestone Sinkholes, Karst
Topography
  • Controlling Factors
  • Promoting Factors
  • Types
  • Examples
  • Human Effects

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Salt Domes
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Learning Objectives Supplement
  • Understand the types of subsidence and the causes
    of each type
  • Key controls of subsidence processes, and
    mitigation
  • Human effects that promote or mitigate subsidence
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