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|In this Bureau of Mines report, the authors present the results of laboratory tests on the burst proneness of coal, Many researchers have studied the violent breaking of large coal masses in underground mines, called bursts, but the causes remain uncertain. They have often assigned to geology and gas pressure the causative roles. The objective of this work is to show that stress can produce bursts in my coal if constraint is necessary for pillar survival and is suddenly lost. We tested coal samples from 15 mines, in 11 coal seams, in six states in the laboratory, and 13 were made to burst. These burst were produced in several ways, but segmented steel platens were used in the tests reported. Two parameters analogous to the momentum and k-tic energy were used to rank the burst proneness of the coals tested. Tangential strains over the the surface of the model coal pillar were measured to reveal a periodic slipping prior to the burst.|
Additional chapters/articles from the SME-ICGCM book Rock Mechanics in Productivity and Protection ? Proceedings Twenty five Symposium on Rock Mechanics
|Mining-Induced Stress Measurement With Hydraulic Borerole Pr||Instrumentation and Monitoring For Pillar Extraction in a De||Reinforcement of Large Pillars by Bolting||Pressure Measurements in the Gob||Determination Of Solution Cavern Spacing In Deep Salt Deposi||Leached Salt Cavern Design Using a Fracture Criterion for Ro||Numerical Modeling Of "Stiff" Backfill in the Coeur D'A||Stress Control Method Applied to Stabilization of Undergroun||Optimun Mining Plan for Multiple Seam Mining||An Investigation of the Causes of Cutter Roof Failure in a C||Methods of Designing Mechanical Roof Bolting in Horizontally||Rock Bursts In Human Collieries||Constraint - The Missing Variable in the Coal Burst Problem||Prediction of Inter-Strata Movements Above Longwall Faces||Controlled Load Development At Longwall Coalfaces||Technique To Measure Resultant Load Vector On Shield Support||An Improved Technique of In-Situ Measurement Of Fracture Zo||Comprehensive Observation And Research On The Mechanism Of W||Displacement Discontinuity Method For Three-Dimensional Stre||Recent Developments In Subsidence Prediction And Control For||A Method For Assessing The Potential Of Mine Subsidence At A||Ground Movements Associated With Pillar Extraction Coal Mini||Application Of Time Domain Reflectometry To Mining||Proposed Criteria For Subsidence Damage To Buildings||Stability of Slopes in Discontinuously Jointed Rock||A Case History of the Effect of Mine Subsidence on a Concret||Microcomputer Simulation of Rock Blasting to Predict Fragmen||Probabilistic Analysis of Blasting Impact on Open Pit Stabil|