双峰县杏子铺镇虎塘村突发特大型矿山采空区地面塌陷,受灾人口达250余户700余人,造成经济损失约4000万元。本文分析认为,条形保安矿柱尺寸严重偏小、矿房跨度过大、上下采场矿柱重叠率低是引发大面积采空区地面塌陷的根本原因。 Shuangfeng County Xingzi Puzhen Hutang sudden large mine mined-out area of ​​the ground collapse, the affected population of more than 700 households more than 700 people, resulting in economic loss of about 40 million yuan. According to the analysis of this paper, the bar size of the pillar is serious and small, the spans of the mine are too large, and the low overlap rate of the pillar in the upper and lower stopes is the root cause of the ground collapse in a large area.