Research on Adaptability of Full-mechanized Caving Mining with Large Mining-height

In order to solve the safety problem from methane concentration in mining face with high mining intensity, full-mechanized top-coal caving mining with large mining-height was put forward. In spite of its advantages in controlling methane, its main problems were pointed out. Higher mining height might reduce coal-wall stability and result in coal or roof fall. Top-coal caving difficulty degree might increase with larger top-coal thickness. Numerical simulation software applied, coal-seam thickness, strength and mining height were believed to be main factors of influencing the adaptability of full-mechanized caving mining with large mining height by orthogonal test. Relationship formula of meeting coal-wall stability and good top-coal caving degree were obtained. Based on this, adaptable conditions of full-mechanized caving mining with large mining-height were presented. This provided theoretical reference for methods selection of safe and high-efficient mining extremely thick coal-seam.