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|"Rib failures are a major hazard in underground mining. When pillars are subjected to loading, extensile cracks are generated parallel to the excavation boundary, which can manifest as rib falls. A common mitigation measure is to install supports, especially bolts, normal to the rib surface. The type and spatial distribution of these supports along the pillar is often based on experience rather than comprehensive analysis. Since conducting field experiments is often impractical and expensive, a convenient alternative is to perform 3D numerical modeling. In this study, FLAC3D has been used to capture the interaction of rib bolts and the failure processes governing the stability of pillars. An associated goal is to determine whether, at all, a continuum software is capable of modeling the effect of supports. The modeling involved two important steps: selection of a proper constitutive model, and, explicit simulation of rock bolts. Based on precursory work in the last decade, an S-shaped strength criterion was chosen that can describe the tensile fracture mechanism of rock at low confinement and shear failure mechanism of rock at high confinement. The built-in pile structural element in FLAC3D is a simplified representation of the complete bolt system. Hence, the different components of a rock bolt (i.e., steel, grout, steel-grout interface, and grout-rock interface) have been explicitly modeled within the rock mass and then tested for its ability to replicate the ground-support interaction behavior. INTRODUCTION Rib failure-related hazards and injuries have plagued the mining industry for decades (Mohamed et al., 2016; Iannacchione and Prosser, 1998). In highly stressed environments, excavation parallel cracks are the primary initiators of skin instability. In absence of any support, this failure can indirectly destabilize the excavation by increasing the exposed span of intersections and roadways. Over the last two decades, there have been numerous injuries (fatal and non-fatal) due to rib failures in underground coal/non-coal mines."|
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|