Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar

Table 2

Definitions for varied critical mining height.

Immediate roof on filling goaf	Basic roof on filling goaf	Adjacent large caving goaf	Adjacent small caving goaf	Equivalent mining height	Description for critical mining height
Breaks up	Breaks up	Instable	Instable		:critical equivalent mining height for immediate roof breaking up in filling goaf
Breaks up	Breaks up	Instable	Stable		:critical equivalent mining height for basic roof breaking up in filling goaf
Breaks up	Breaks up	Stable	Stable		:critical equivalent mining height for adjacent large caving goaf in instability
Breaks up	Bends and subsides	Stable	Stable		:critical equivalent mining height for adjacent small caving goaf in instability
Bends and subsides	Complete	Stable	Stable