Engineering Geophysics - Mine Subsidence Risk Assessment Study

Hanna, Kanaan
Organization: International Conference on Ground Control in Mining
Pages: 12
Publication Date: Jan 1, 2011
Abandoned mines pose a serious threat to public health and safety, as well as the environment. When active workings approach old mine workings, miners could encounter significant hazards. Additionally, the presence of mined-out areas or voids underlying residential/commercial properties, transportation, and infrastructure systems can cause subsidence issues ranging from differential settlements and sinkholes to catastrophic collapse. All these features can result in adverse impacts in terms of cost and public safety. Traditionally, mine void detection and related engineering investigations for mine subsidence risk assessment and mitigation have been greatly dependent on systematic drilling and grouting backfill programs. The unknown location and condition of abandoned underground mines represent significant challenges to geologists and engineers in accurately evaluating subsidence hazards and developing appropriate mitigation measures. A comprehensive, multi-phase mine subsidence investigation was conducted at an abandoned western U.S. mine site. The mine operated in an approximately 8-ft (2.4-m) -thick coal seam using room-and-pillar extraction from 1919 to 1922. The mine lies at depths ranging from 50 to 100 ft (15 to 30 m), and it is overlain by critical pipeline and utility corridors. Any future subsidence/ sinkhole that occurs beneath or adjacent to the corridors could pose a significant threat, specifically to the structural integrity of the pipeline corridor. Therefore, the engineering geophysical investigation was initiated to determine the potential subsidence risk. This paper describes a recent success achieved by using integrated engineering geophysics in subsidence risk evaluation. A summary of significant results with emphasis on subsurface characterization, mine workings and voids delineation, modeling analysis, and high risk zones identification and mitigation strategy is presented.
Full Article Download:
(2567 kb)

Additional chapters/articles from the SME-ICGCM book 30th International Conference on Ground Control in Mining

A Study on Geotechnical Risks in Interaction Between Open-Pi
Think Like a Rock
Mapping and Application of Roof Joint Patterns for Ground Co
The Autowarning Telltale: A New Safety Monitoring Device for
Recent Innovations for Slope Development
Analysis of Roof Falls at and Recommendation of Roof Control
The Introduction of Uk Rockbolting Technology into Coal Mine
A Pipeliner's Perspective on Longwall Mining
Why Dead Load Suspension Design for Roadway Roof Support Is
Investigation Into Abnormal Surface Subsidence Above a Longw
Protecting Underground Coal Miners From Rib Falls
MSHA Technical Review of Proposed Mine Designs for U.S.Under
Prediction of Roof Fall Rate in Coal Mines Using Fuzzy Logic
Surface Subsidence Velocity of Fully-Mechanized Thick Seam T
Engineering Geophysics - Mine Subsidence Risk Assessment Stu
A Retrospective on LaModel (Or Dr. Heasley?s Wild Ride)
Safe Pillar Extraction Practice - Some Geotechnical Principl
Case Study of Roof Behaviour and Conditions for Longwall Fac
Early Warning of Longwall Weighting Events and Roof Cavities
Streams and Longwall Coal Mining Subsidence: A Pennsylvania
Surface Structures Impacted By Subsidence From Pennsylvania
GIS Supported Evaluation of Surface Level Impacts Due to Aba
Development and Application of Impact-Resistant Lagging for
Detection and Monitoring of Surface Subsidence Associated wi
Applications of ARMPS (Version 6) to Practical Pillar Design
The Duncan Method of Partial Pillar Extraction at Tasman Min
The Duncan Method of Partial Pillar Extraction at Tasman Min
Geotechnical Considerations for Longwall Top Coal Caving at
Assessment of the Dynamic Loads Effect on Underground Mines
Designing Shotcrete As Primary Support in Tunnels
The Influence of Interface Friction and W/H Ratio on the Vio
Gateroad Support in the Czech and Polish Coal Mining Industr
Study on Eco-Friendly Underground Mining System for Ultra-Th
Ground Control Technology for Mass Exploitation of Coal Depo
The Initial Performance of Commonly Used Primary Support on
Application of Stress, Geologic, and Support Design System (
A Retrospective Assessment of Ground Control Research and Ap
Calculating the Mining-Induced Horizontal Deformation Indice
Understanding the Causes of Roof Control Problems on a Longw
The Technical Progress and Problems to Be Solved of Thick Co
Topography and Coal Seam Initial Stress Estimation: a Sensit
The Effects of Longwall Coal Mining on the Hydrogeology of S
Application of Yield-Lok Bolt for Bursting and Convergence G
Research on Mine Pessure Behaviors and Overlying Strata Move
Preventing Roof Fall Accidents - An Operation's Approac
Roof Bolting for Long-Term Entries in Underground Coal Mines
Numerical Modeling of the Pillar Confinement with Backfillin