New coal pillar strength formulae considering the effect of interface friction
Simon Heru Prassetyo, Muhammad Alen Irnawan, Ganda Marihot Simangunsong, Ridho Kresna Wattimena, Irwandy Arif, Made Astawa Rai Mining Engineering Program, Institut Teknologi Bandung, Indonesia https://doi.org/10.1016/j.ijrmms.2019.104102 Highlights Coal pillar strength formulae considering the interface friction are developed. The new formulae are compared against stable and unstable pillar cases. The linear-low friction formula provides best representation […]