Risk Assessment and Control Strategy of Residual Coal Pillar in Room Mining: Case Study in Ecologically Fragile Mining Areas, China

Gradual instability of coal pillars left behind underground with room mining is one the main reasons for sudden roof caving in gob, surface subsidence, and other significant hazards. Moreover, implies great losses resources. In this paper, failure mode pillar process were analyzed according to coalfield regional engineering geological hydrogeological conditions. A numerical model was adopted study effect different sizes progressive on plastic zone’s evolution characteristics stress field stope. The proposed technologies cemented paste backfilling reinforcement residual are applied, a simulation established strata movement analyze stability degree key aquiclude Pliocene series Neogene. Consequently, performance application prospect evaluated. results obtained substantiate new method long-term control protecting ecological environment China’s western eco-environmental frangible area.