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New Developments With The Coal Mine Roof Rating

NEW DEVELOPMENTS WITH THE COAL MINE ROOF RATING

The Coal Mine Roof Rating (CMRR) was developed nearly 10 years ago to try to fill this gap (1, 2). The CMRR weighs the geotechnical factors that contribute to roof competence, and combines them on single rating scale of zero to 100. The CMRR integrates

CDC Mining New Developments with the Coal Mine

The Coal Mine Roof Rating (CMRR) has been incorporated into many aspects of mine planning, including longwall pillar design, roof support selection, feasibility studies, and extended cut evaluation. This paper presents recent improvements and application of the CMRR.

New Developments with the Coal Mine Roof Rating

21st International Conference on Ground Control in Mining New Developments with the Coal Mine Roof Rating Chris Mark, Chief, Rock Mechanics Section Greg Malinda, Research Geologist Tim Barton

NIOSHTIC-2 Publications Search 20024703 New

The Coal Mine Roof Rating (CMRR) was first presented at this conference 9 years ago. Since its introduction, the CMRR has been incorporated into many aspects of mine planning, including longwall pillar design, roof support selection, feasibility studies, and extended-cut evaluation.

New Developments With The Coal Mine Roof Rating

The Coal Mine Roof Rating (CMRR) was first presented at this Conference nine years ago. Since its introduction, the CMRR has been incorporated into many aspects of mine planning, including longwall pillar design, roof support selection, feasibility studies, and extended cut evaluation.

CDC Mining CMRR Coal Mine Roof Rating NIOSH

The CMRR was designed to evaluate the properties of the coal mine roof rock mass which contribute to its weakness and convert them into a relative strength rating from 0-100. These properties include the cohesion and frequency of discontinuities like bedding, slips,

A Modified Coal Mine Roof Rating Classification System to

3/1/2017 The coal mine roof rating (CMRR) classification system has been applied in a number of coal mines worldwide including Australia. However, the current system cannot be used directly to design support measures in underground mines. Two case studies, the Eliza Hill project in Australia and Tabas coal mine in Iran were analyzed to assess the impact of various rock properties and gallery geometry

The Coal Mine Roof Rating (CMRR)—a decade of experience

The Coal Mine Roof Rating (CMRR) was developed by the U.S. Bureau of Mines as an engineering tool to quantify descriptive geologic information for use in coal mine design and roof support selection.

(PDF) An approach to map geotechnical uncertainty in

New developments with the coal mine roof rating Article Full-text available Jan 2002 G. M. Molinda Barton Timothy The Coal Mine Roof Rating (CMRR) was first presented at this Conference nine years

Developing a new model based on neuro-fuzzy system for

Mark C, Molinda GM, Barton TM (2002) New developments with the coal mine roof rating. In: Proceedings of the 21st international conference on ground control in mining. West Virginia University, Morgantoen, WV, pp 294–301