If you have access to OneMine as part of a member benefit, log in through your member association website for a seamless user experience.
|"Geological factors and mine design contribute to mining-induced seismic activity, and this is especially true in longwall mining. Massive rock units are a key cause of seismic activity due to catastrophic failures that release large amounts of energy. Other factors, such as overburden depth, panel design, pillar design, rock strength, and proximity of the massive rock unit to the coal seam, all have a role in the potential and size of a seismic event. A recent seismic event was recorded by a deep longwall mine in Virginia at 3.7ML on the local magnitude scale and 3.4 MMS by the United States Geological Survey (USGS) in July 2016, which had no impact on the mining operations. Further investigations by NIOSH and Coronado Coal researchers have shown that this event was associated with geological features that have also been associated with other, similar seismic events in Virginia. Detailed mapping and geological exploration in the mining area has made it possible to forecast possible locations for future seismic activity. In order to use the geology as a forecaster of mining-induced seismic events and the energy potential, two primary components are needed. The first component is a long history of recorded seismic events with accurately plotted locations. The second component is a high density of geologic data within the mining area. In this case, 181 events of 1.0ML or greater were recorded by the mine’s seismic network between January, 2009, and October, 2016. Within the mining area, 897 geophysical logs were analyzed from gas wells, 224 core holes were drilled and logged, and 1,031 fiberscope holes were examined by mine geologists. From this information, it was found that overburden thickness, sandstone thickness, and sandstone quality contributed greatly to seismic locations. After analyzing the data, a pattern became apparent indicating that the majority of seismic events occurred under specific conditions. Three maps were created using MineScape geological mapping software. MineScape deploys an interpolator known as FEM (finite element method) and is based on a series of gridded triangles to forecast the probability and magnitude of an event if a particular panel were to be mined. The forecast maps have shown accuracy of within 74%–89% when compared to the recorded 181 events that were 1.0 ML or greater when considering three major geological criteria of overburden thickness of 1900 feet or greater, 20 to 40 feet of sandstone within 50 feet of the Pocahontas number 3 seam, and a longwall caving height of 15 feet or less."|
Additional chapters/articles from the SME-ICGCM book Proceedings of the 36th International Conference on Ground Control in Mining
|Analysis of Monitored Ground Support and Rock Mass Response||Applying Robust Design to Study the Effects of Stratigraphic||Evaluation of Seismic Potential in a Longwall Mine with Mass||Damage and Permeability Evolution Mechanisms of Coal under U||Coal Bursts That Occur During Development: A Rock Mechanics||Geotechnical Challenges and Experiences of Working a Deep an||Case Study of the Barro Branco Coal Mine Pillar Burst||Numerical Modeling the Interburden Impact on Multiple-Seam C||Basic Procedures for Monitoring and Modeling Abandoned Under||Coal Rib Response during Bench Mining: A Case Study||Geotechnical Considerations for Concurrent Pillar Recovery i||Highwall Mining of Thick, Steeply Dipping Coal: A Case Study||Coal Pillar Design When Considered as an Overburden Reinforc||Analysis of Global and Local Stress Changes in a Longwall Ga||CBM Extraction Engineering Challenges and the Technology of||Numerical Analysis of the Effect of Coal Seam Characteristic||3D Modelling of Mine Backfill||Spreading of Ground Pressure Fluctuation in the Gob||Research Progress on Fully Mechanized Mining Technology of S||Fundamental Principles of an Effective Reinforcing Roof Bolt||Ten Factors about Standing Supports That Might Surprise You||Effect of Vertical Discontinuities on Roof Stability and Gro||The Relationship between Ultrasonic Velocities and Mechanica||Moisture–Induced Swelling of Illinois Mine Roof Shales: A Vi||Ground Control of Longwall Top–Coal Caving Faces within Thic||Coal Strength Variation by Lithotype for High-Volatile a Bit||Deep Cover Bleeder Entry Performance and Support Loading: A||Study on Appropriate Support System and Control Criteria for||Case Study and Design of Standing Steel Set Support for Aged||Modeling the Effect of Bolts on the Behavior of Rock Pillars||Tekcrete Fast®: Fiber-Reinforced, Rapid-Setting Sprayed Conc||A New Generation of Web-Based Applications for Mine Design||User-Friendly Finite Element Design of Main Entries, Barrier||Development and Evaluation of Corrosion Resistant Coating fo||Mechanism and Prevention Measure of Rib Spalling in 6.5 Mete||Development Process for a Greater Capacity Propsetter® Syste||Development, Trials, and Testing of a Two-Component, Rapid-S||Application of Updated Joint Detection Algorithm for the Ana||Study of the Backfill Confined Consolidation Law and Creep C||Changes in Stress and Displacement Caused by Longwall Panel||Geotechnical Monitoring of Rock Mass and Support Behaviour a||Upwards Surface Movement above Deep Coal Mines after Closure||The Use of the Area of Main Influence to Fix a Relevant Boun||High-Precision Dynamic Subsidence Prediction Model Aided by||SDPS Update: Easy Calculation of the Edge Effect Offset for|