复杂地质条件下两种采矿方法共同开采时地表变形规律研究

Surface Deformation by a Combination of Two Mining Methods under Complex Geographic Conditions

采用相似模拟实验、数值模拟和现场测试相结合的方法对程潮铁矿无底柱分段崩落法和充填法共同开采时的地表变形情况进行了研究,同时利用地压在线监测系统进行应力测试,确保保安矿柱回收的顺利进行。结果表明,地表最大沉降值为54 mm,基本保证地表的稳定性;垂直矿体走向方向地表的垂直位移值与开采中心的距离正相关,水平位移值则以开采中心呈现中心反对称。随距开采中心距离增大,矿区地表垂直位移和水平位移绝对值逐渐减小。该研究可为程潮铁矿井下矿体共同开采提供参考。

Surface deformation by a combination of sublevel caving method and cut-and-fill method in Chengchao Iron Mine was studied with similar simulation,numerical simulation and in-situ tests,and an on-line monitoring system of ground pressure was used for the stress test,so as to ensure the successful recovery of safety pillars. It is found that the surface subsidence being maximally at 54 mm generally won' t bring impact on the surface stability,the vertical displacement of surface along the vertical strike of the orebody has a positive correlation with the distance away from the mining center,and the horizontal displacement on both sides of the mining center presents an inverse symmetry. With an increase in the distance away from the mining center,the absolute values of surface displacement in vertical and horizontal directions are decreasing gradually. This result can be of reference for Chengchao Iron Mine with a combined mining method underground.