Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"pillar design"”.
-
Pillar design for St. Peter sandstone formation
… to extract St. Peter Sandstone. The room and pillar mining method has been successfully used for St. Peter Sandstone mining in a few US locations, however, no one has proposed a rigorous pillar design method. The goal of this research is to: (1) elucidate factors contributing to ground control …
-
Optimizing Pillar Design for Improved Stability and Enhanced Production in Underground Stone Mines
… mass behavior for maximizing safety. Optimizing pillar design is essential for preventing hazardous incidents and improving production in room-and-pillar mines. Maintaining regional and global stability is complicated for underground carbonate or stone deposits, where extensive fracture networks …
-
A Risk-Based Pillar Design Approach for Improving Safety in Underground Stone Mines
The collapse of a mine pillar is a catastrophic event with great consequences for a mining operation. These events are not uncommon, and have been reported to produce air blasts able to knock down, seriously injury or kill miners; cause cascade pillar failures which involve the collapse of …
-
High-power single-mode vertical-cavity surface-emitting lasers
… principles into new, novel approaches. The design rules, optimization parameters, fabrication, and characterization of three different structures are presented with an in-depth analysis of performance and future improvement. The devices presented include the metallic spatial filter, the …
-
Investigation into yield pillar behavior and design considerations
Adopting yield pillars has been considered an effective way of alleviating ground control problems and increasing production. The purpose of this research was to study the behavior of yield pillars and to develop the design criteria. After a literature review, two 2-D finite element models were …
-
Optimizing secondary tailgate support selection
… United States. The ALPS (Analysis of Long wall Pillar Stability) program was used to determine adequacy of pillar design for the successful longwall case histories. A relationship was developed between the secondary support density necessary to maintain a stable tailgate entry during mining and …
-
Interactive prediction software for underlying multi-seam design
… studies was compiled. A critical review of the design principles outlined in this literature resulted in the compilation of specific design criteria for the design of lower seam mines. Analysis of this criteria demonstrated the necessity for a protocol for the design of unsymmetrically loaded …
-
Calibrating the LaModel Program for Shallow Cover Multiple-Seam Mines
… coal mines (Pappas and Mark, 2012).;To help with designing stable mine pillars in deep-cover situations, a new calibration method for deep-cover pillar retreat mining was developed and implemented into the LaModel 3.0 program a few years ago (Heasley et al., 2010). This calibrated method was …
-
Integrating the LaModel and ARMPS Programs (ARMPS-LAM)
… If the LaModel analysis of an ARMPS-type mine design, could be made as easily and quickly as an ARMPS analysis and calibrated against a large database, the potential exists to improve the quality of overall mine design.;In this research, a computer code (ARMPS-LAM) has been developed to …