J Gholamnejad - Assistance professor, Department of mining and metallurgical engineering - Yazd University, Yazd,Iran,
M Ghadimi Yamcheloo - Tabas Coal Mine Project, Iran

One of the basic parameter of mine design in Room and Pillar Method is accuratedesign of pillars’ dimensions, so that having economized project, safety faces,mining operation and recovery pillar are depend on accurate design of pillars’dimensions. In Room and Pillar Method, a part of mine material reminds as a pillar,so the main goal of pillars’ design is to design pillars with minimum dimensions thatkeep the faces safe and create stable rooms. The goal of this research is to calculateand design the optimum pillars’ dimensions in Room and Pillar Method for seam C۱in Parvadeh -Tabas coal mine. For this purpose, first the condition of Central Mineroof has been analyzed using Coal Mine Roof Rating (CMRR), the result of theprogram CMRR ۲۰۰۷ is CMRR= ۴۷ and the adjusted one is CMRR= ۴۰ whichdemonstrate the weak roof of the mine. The length and width of pillars are۱۵m×۱۵m and optimum excavation rate is ۴۳.۸% for seam C۱ are designed bySoftware ARMPS. Because of the ۴% excavation rate and ۱۵.۲۵ m۲ pillars’ areadecrease, with the same bolt plan (ARBS) as well as the previous design, this designis economized.

Parvadeh , Room & Pillar, CMRR, ALPS, ARBS