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SME-ICGCM (1801)
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TITLE Damage and Permeability Evolution Mechanisms of Coal under Unloading Condition
SUMMARY "Major coal mining areas in eastern China have entered into the deep mining state. Gas pre-drainage, which has been successful at shallower depths, is not suitable at greater depths because of complex conditions. Coal permeability, which is closely related to the damage behavior of coal, is the most important parameter in determining gas migration and gas drainage in a coal seam. To achieve an optimal gas drainage design in a deep mining state, the damage and permeability evolutions of coal shou...
AUTHOR Wang, Ranpeng ; Liu, Qingquan (primary); Cheng, Yuanping ; Liu, Zhengdong ; Zhang, Kaizhong ; Jiang, Zhaonan ; Hu, Biao
TITLE Evaluation of Seismic Potential in a Longwall Mine with Massive Sandstone Roof under Deep Overburden
SUMMARY "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 de...
AUTHOR Van Dyke, Mark A. (primary); Su, Wen H. ; Wickline, Joe
TITLE Coal Strength Variation by Lithotype for High-Volatile a Bituminous Coal in the Central Appalachian Basin
SUMMARY "This paper discusses the variation of coal strength based on the megascopic coal lithotypes for Central Appalachian high-volatile A coal beds. The composition of coal beds is complex and variable, depending on the depositional environment associated with original plant material, inflow of clastic material, and water level fluctuations in the original swamp/mire environment. Thus, different types of coal and sediment are formed within each coal bed. These differences in coal composition were fir...
AUTHOR Rusnak, John A.
TITLE Development, Trials, and Testing of a Two-Component, Rapid-Set Cement Grouting System
SUMMARY "In unfavorable strata conditions, it is often necessary to install additional long tendon support as part of a primary support cycle. Although these support systems provide the required additional stability to the roadway installation does have a significant effect on the rate of development. To overcome the slow cure time of Portland cement-type grouts, the use of two component resin systems, such as polyurethanes and urea silicates, have become favorable. However, concerns over low modulus an...
AUTHOR Meikle, Tom (primary); Hawker, Robert ; Grubb, Colin ; Tadolini, Stephen C. ; Mills, Peter
TITLE Geotechnical Challenges and Experiences of Working a Deep and Wide Longwall Face: A Case Study of Adriyala Longwall Project, SCCL
SUMMARY "India’s tryst with mechanized longwall coal mining started with the introduction of the first self-advancing powered support longwall (PSLW) face at Moonidih Colliery of Jharia Coalfield in 1978 and at Godavarikhani (GDK)7 Incline of Singareni Collieries Company Limited (SCCL) in 1983. During the last 37 years, about 30 longwall units in Coal India, Ltd., (CIL) and 10 longwall units in SCCL have been introduced with powered roof supports of varying capacity, ranging from 280 to 800 tonnes, in m...
AUTHOR Boothukuri, Veera Reddy (primary); Charan, Panigrahi Durga ; Madhav, Bhattacharjee Ram ; Benerjee, Gautam
TITLE 3D Modelling of Mine Backfill
SUMMARY "Numerical modeling has been used extensively to assess the stability of surface and underground mines. Tabular, steeply dipping ore bodies are generally mined out by open stoping methods with delayed backfill. Cemented rockfill (CRF) is employed as a backfill material for narrow vein deposits with low production rates. Sublevel stoping methods with delayed backfill are employed to mine out steeply dipping ore bodies. Backfill is exposed to blast-induced vibrations and dynamic loading due to los...
AUTHOR Emad, Muhammad Zaka (primary); Khan, Muhammad Usman ; Goraya, Rangzeb
TITLE Modeling the Effect of Bolts on the Behavior of Rock Pillars and Associated Insights on Rib Reinforcement
SUMMARY "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 ...
AUTHOR Sinha, Sankhaneel (primary); Walton, Gabriel
TITLE User-Friendly Finite Element Design of Main Entries, Barrier Pillars, and Bleeder Entries
SUMMARY "This contribution describes development and application of a user-friendly finite element program, UT3PC, to address three important problems in underground coal mine design: (1) safety of main entries, (2) barrier pillar size needed for entry protection, and (3) safety of bleeder entries during the advance of an adjacent longwall panel. While the finite element method is by far the most popular engineering design tool of the digital age, widespread use by the mining community has been impeded ...
AUTHOR Lawson, Heather E. (primary); Larson, Mark K. ; Pariseau, William G. ; Tesarik, Douglas R.
TITLE The Relationship between Ultrasonic Velocities and Mechanical Damage in Sandstone under Cyclic Loading
SUMMARY "This laboratory study investigates the damage evolution of sandstone specimens under two types of cyclic loading conditions through monitoring and analyzing the variations of elastic moduli and ultrasonic velocities. We adopted the rigidity degradation method for evaluating the damage accumulation through the rock dynamic ultrasonic velocity measurements. Compared to the ultrasonic test, the method of rigidity degradation shows deficiencies in the detection of damage development. The cyclic loa...
AUTHOR Yang, Sen (primary); Liu, Shimin ; Zhang, Hongwei
TITLE Development and Evaluation of Corrosion Resistant Coating for Expandable Rock Bolt against Highly-Corrosive Ground Conditions
SUMMARY "Expandable rock bolts are widely used in hard rock mines as an efficient ground control product. However, capacity and service life can be significantly reduced if the metallic body is subjected to corrosion. In some hard rock mines in the U.S., highly corrosive ground conditions exist, and it has been reported that inflatable rock bolts have corroded within a few months after installation. To provide mining industry a cost-effective inflatable bolt and combat the corrosion issues, Jennmar Corp...
AUTHOR Ma, Kevin J. (primary); Stankus, John ; Faulkner, Dakota