Abstract：A phenomenon of sub-critical mining subsidence appears in Jiaoping mining area in Shaanxi Province，which is under the conditions of great mining depth，thick seam and fully-mechanized top-coal caving. By similar material tests，the relationships of ground movement with the width of working face，the size of face-separated pillar，and the lithologic characteristic of overlying strata are studied. The main characters of rock masses movement are revealed. The achieved results prove that the face-separated pillars with a definite width can effectively control ground subsidence. It will provide references to those mines with similar conditions in Jiaoping mining area.
