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New Method for Yield Pillar Design to Control Coal Bumps.

PB2019101096

Publication Date	2003
Personal Author	Peng, S. S.; Morsy, K.
Page Count	205
Abstract	Coal mine bumps have presented serious mining problems in the United States throughout the 20th century. Also, it is anticipated that as the easily recoverable reserves are depleting, the trend will be toward deeper mines. Current practice of yield pillar applications shows that it can prevent coal bumps in some long wall mines and safe coal reserves for deep mines. The current methods of yield pillar design size the yield pillar just to be yielded without considering the pillar instability after it yields. The coal bumps problem arises after the pillar yields. Finite Element technique is a good approach to simulate the complex loading conditions of the yield pillar systems. Unfortunately most of FE commercial codes are not designed for mining applications. Therefore an adoption for any implemented FE code should be an essential step towards a rational design method. Finally, a computer-based program which can design stable yield pillar systems for most common geological and geometrical conditions would be extremely useful. In this work coal pillar and gob models were developed. The key issues of the newly developed method, it evaluates the pillar stability in post-peak region also it divides the yield pillar into three loading zones; namely core, transition and rib zones. An appropriate stability criterion was assigned for each zone. An interpolation model for the pillar stability measures based on a full factorial analysis for the geological and geometrical factors was developed. A PC-program was established based on a proposed design algorithm and the developed interpolation model. This program is able to design and evaluate the 2-entry yield pillar systems.
Keywords	Coal mining Mining industry Rock mechanics Occupational hazards Engineering controls Engineering Models Rock bursts Rock falls Geology Ground control Ground stability Design algorithms
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	48A - Mineral Industries 48B - Natural Resource Management 48E - Soil Sciences 50D - Soil & Rock Mechanics 44G - Environmental & Occupational Factors 57M - Occupational Therapy, Physical Therapy, & Rehabilitation 95G - Protective Equipment 95D - Human Factors Engineering 48F - Geology & Geophysics 41K - Engineering Materials 94H - Industrial Safety Engineering 94E - Environmental Engineering
Corporate Authors	West Virginia Univ. Research Corp., Morgantown.; National Inst. for Occupational Safety and Health, Atlanta, GA.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	201921

New Method for Yield Pillar Design to Control Coal Bumps.

New Method for Yield Pillar Design to Control Coal Bumps.
PB2019101096

Publication Date	2003
Personal Author	Peng, S. S.; Morsy, K.
Page Count	205
Abstract	Coal mine bumps have presented serious mining problems in the United States throughout the 20th century. Also, it is anticipated that as the easily recoverable reserves are depleting, the trend will be toward deeper mines. Current practice of yield pillar applications shows that it can prevent coal bumps in some long wall mines and safe coal reserves for deep mines. The current methods of yield pillar design size the yield pillar just to be yielded without considering the pillar instability after it yields. The coal bumps problem arises after the pillar yields. Finite Element technique is a good approach to simulate the complex loading conditions of the yield pillar systems. Unfortunately most of FE commercial codes are not designed for mining applications. Therefore an adoption for any implemented FE code should be an essential step towards a rational design method. Finally, a computer-based program which can design stable yield pillar systems for most common geological and geometrical conditions would be extremely useful. In this work coal pillar and gob models were developed. The key issues of the newly developed method, it evaluates the pillar stability in post-peak region also it divides the yield pillar into three loading zones; namely core, transition and rib zones. An appropriate stability criterion was assigned for each zone. An interpolation model for the pillar stability measures based on a full factorial analysis for the geological and geometrical factors was developed. A PC-program was established based on a proposed design algorithm and the developed interpolation model. This program is able to design and evaluate the 2-entry yield pillar systems.
Keywords	Coal mining Mining industry Rock mechanics Occupational hazards Engineering controls Engineering Models Rock bursts Rock falls Geology Ground control Ground stability Design algorithms
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	48A - Mineral Industries 48B - Natural Resource Management 48E - Soil Sciences 50D - Soil & Rock Mechanics 44G - Environmental & Occupational Factors 57M - Occupational Therapy, Physical Therapy, & Rehabilitation 95G - Protective Equipment 95D - Human Factors Engineering 48F - Geology & Geophysics 41K - Engineering Materials 94H - Industrial Safety Engineering 94E - Environmental Engineering
Corporate Authors	West Virginia Univ. Research Corp., Morgantown.; National Inst. for Occupational Safety and Health, Atlanta, GA.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	201921