Subsidence
Objective: This course provides participants with information to enhance their scientific knowledge and technical skills in predicting subsidence, identifying methods to protect and or minimize damages caused by subsidence, and the surface effects and impacts caused by longwall and room-and-pillar underground mining methods. Duration: 3 days
Agenda
Introduction
Overview of Course
Statistics on Longwall Numbers and Production
Longwall Mining
Room and Pillar Mining with Retreat Mining
Mechanics of Subsidence
Mechanics of Overburden Movement
Zones of Movement
Factors Controlling the height of Caved and Fractured Zones
Planned Versus Unplanned Subsidence
Relationship Between Subsidence and Percent Extraction
Longitudinal and Transverse Profile
Parameters that Characterize Subsidence
Angle of Draw
Angle of Break
Angle of Critical Deformation
Inflection Point
Radius (r) and Angle (B) on Major Influence
Maximum Subsidence and Subsidence Factor
Types of Subsidence trough (critical, sub-critical, sup-critical)
Relationship Between Subsidence Factor and Percent Hardrock
Relationship Between Subsidence Factor and Width/Depth Ratio
Multiple Panels
Time Effects
Dynamic Surface Movement
Other
Subsidence Prediction Methods
Subsidence Development Prediction System (SDPS)
Comprehensive and Integrated Subsidence Prediction Model (CISPM)
National Coal Board Method (NCB)
Penn State University Model (PSU)
Buelah Model
Other Models
Requirement of Energy Policy Act
(EPACT) 92
Surface Structural Damage/Prediction
Damage To Renewable Resources
Damage To Water and Aquifers
Theories on Mitigation Measures
Methods To Minimize or Prevent Subsidence Damage
How to Conduct Subsidence Damage Investigation
Engineering Tools Available for Documentations
Subsidence Monitoring - Layout of Monuments
Design of Mine Pillars
Pillar Load
Pillar Sttrength Using Four Formulas Applied in the United States
Pillar Strength After Flooding
Pillar Design for Multi-Seam Conditions
Abutment Pressure During Retreat Mining
Pillar Strength for Weak Floor/Roof
Pillar Strength for New Mines and Abandoned Mines
Designing Pillars Using SDPS
Case Studies and Problem Exercises
Who Should Attend: Mining Engineers, Geologist, Hydrogeologists, Mine Inspectors, Mine Permit Reviewers, Regulatory Personnel, Program Managers, and Attorneys dealing with Subsidence cases.
National Technical Training Program : (202) 208-2769