Results 1 - 10 of 46

• Modeling the Effect of Seal Leakage on Spontaneous Heating in a Longwall Gob Area
  6/1/2010 - Conference papers
  In this NIOSH study, a computational fluid dynamics (CFD) model developed in previous work is used to model the effect of seal leakage on spontaneous heating of coal in longwall gob behind the seal.
• Modeling the Effect of Barometric Pressure Changes on Spontaneous Heating in Bleederless Longwall Panels
  3/1/2010 - Conference papers
  The effect of inflow and outflow of gas on the potential spontaneous heating in the gob was investigated using the computational fluid dynamics (CFD) model.
• Case History of the Response of a Longwall Entry Subjected to Concentrated Horizontal Stress
  2/1/2007 - Peer reviewed journal articles
  A study of ground behavior, reinforcement performance and stress redistribution looked at a longwall tailgate under severe horizontal stress. Comparison to field results showed that a FLAC-2D model captured the significant roof and support behavior.
• A Field Study of Longwall Mine Ventilation Using Tracer Gas in a Trona Mine
  12/1/2019 - Peer reviewed journal articles
  An article describing a field study conducted to understand the role of gas dynamics in variable broken rock, as well as investigate airflow exchanges between the face and gob.
• Overview of Current US Longwall Gateroad Support Practices: An Update
  12/1/2019 - Peer reviewed journal articles
  An overview of recent trends in US longwall mining, with an emphasis on accident and injury trends, as well as support systems and ground conditions.
• Ground Response to High Horizontal Stresses During Longwall Retreat and its Implications for Longwall Headgate Support
  2/19/2019 - Peer reviewed journal articles
  An article discussing roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary.
• Analysis of Global and Local Stress Changes in a Longwall Gateroad
  2/5/2019 - Peer reviewed journal articles
  An analysis of a numerical-model-based approach for estimating the changes in both the horizontal and vertical loading conditions induced by an approaching longwall face.
• Empirical Guidelines for Longwall Ground Control Design
  10/22/2016 - Research projects
  A project to update the database of case histories upon which the Analysis of Longwall Pillar Stability (ALPS) software bases its recommended stability factors.
• Calibration and Verification of Longwall Stress Models
  10/22/2016 - Research projects
  A project to address the paucity of guidance in available literature for assessing the design an underground longwall coal mine for safe ground response to mining with numerical stress analysis tools.
• Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
  11/1/2010 - Peer reviewed journal articles
  This paper describes a practical approach for implementing stochastic determination of gob gas ventholes production performances and for generalizing the prediction capability of deterministic models.