Study on the Law of Earth’s Surface Movement on Ultra-Long Working Face

High-intensity mining effect induced by long working face causes dynamic disasters to safe and efficient coal mining. For the purpose of in-depth study movement law earth’s surface on ultra-long face, this paperused build a numerical model, analyzes roof-to-floor strata behaviors in bed during mining, studies weakening parameters bed, bearing pressure roof caving rock movement. Analyzes length resulted from difference lengths. It has been recognized that sphere influence changes small large then small, distribution arch bottom height at plastic failure zone are further intensified over advancing moreover, is subject cumulative direction effect. The above-mentioned research results can serve as theoretical basis for practical engineering.