Results 81 - 90 of 97

• Investigation of the Jacking Force Capability of Tunnel Liners
  2/1/2002 - Conference papers
  Steel liner plates are used to provide protective linings in the tunneling industry. This report summarizes test results, examines design parameters that impact jacking force capability, and develops models to improve design load prediction.
• A Model for the Structure of Round-Strand Wire Ropes
  6/1/2001 - Non-peer reviewed journal articles
  This report provides a generalized mathematical model that completely describes the geometry of the wires in round-strand wire ropes.
• Safety Considerations for Transport of Ore and Waste in Underground Ore Passes
  3/1/1999 - Peer reviewed journal articles
  NIOSH researchers are investigating methods to improve safety during the transport of ore in ore passes.
• Coal Mine Subsidence Prediction Using a Boundary-Element Program
  3/1/1999 - Conference papers
  This paper presents several case studies in which a mechanics-based boundary-element program is used to back-calculate the surface subsidence associated with various panels at several northern Appalachian coal mines.
• The State-of-the-Art in Coal Pillar Design
  3/1/1999 - Conference papers
  Recently, powerful design methods have emerged from analysis of large data bases of real-world pillar successes and failures. In the process, our understanding of pillar mechanics has been greatly enriched.
• A Hybrid Statistical-Analytical Method for assessing Violent Failure in U.S. Coal Mines
  1/1/1999 - Information Circulars
  This work identified the most important variables contributing to coal bumps. These are (1) mechanical properties of strata, including local yield characteristics of a mine roof and floor, (2) gate pillar factors of safety, (3) roof beam thickness, join...
• Model for the Structure of Round-Strand Wire Ropes
  9/1/1998 - Reports of Investigations
  The behavior of wire ropes used in hoisting is not well understood. In an effort to improve this understanding, the structure of round-strand wire ropes was analyzed. This report provides a generalized mathematical model that completely describes the g...
• A Static Fatigue Constitutive Law for Joints in Weak Rock
  4/1/1998 - Conference papers
  Researchers from the Spokane Research Laboratory of the National Institute for Occupational Safety and Health (NIOSH) are developing numerical modeling tools to forecast time-dependent deformation around coal mine entries.
• Simplified Pre- and Post-Processing Technique for Performing Finite-Element Analyses of Deep Underground Mines
  8/1/1997 - Conference papers
  Demonstration of a technique developed at the Spokane Research Center that allows the user to create a finite-element model of a two-dimensional section of an underground mine in a relatively straightforward manner.
• Modeling the Effects of Longwall Mining on the Ground Water System
  1/1/1995 - Reports of Investigations
  A hydrologic-subsidence investigation was performed to evaluate the effects of longwall mining on the local groundwater regime through field monitoring and numerical modeling.