【摘要】 采空区地表沉降影响因素众多,以有限元软件ANSYS为基础,利用数值模拟方法的灵活性,分别对各主要影响因素进行分析。选用适合于岩土类材料的德鲁克-普拉格本构模型,利用ANSYS特有的"杀死单元"命令模拟矿体被采出,再通过"激活单元"命令模拟采空区被填充。分别研究了开采深度、开采厚度、地形条件、采空区填充等因素对地表沉降的影响。结果表明:随开采深度的增加,地表变形随之降低;随开采厚度的增加,地表变形增长较快;随着地形坡度的变化,采空区地表移动盆地逐渐向地势较低方向移动;矿体开采后及时充填,对控制地表变形效果显著。更多还原

【Abstract】 There are many factors to influence on the ground settlement in mined-out area.Based on the finite element software ANSYS,making use of the flexibility of numerical simulation method,the main factors are analyzed respectively.The Druker-Prager model is chosen,which is suitable to simulate the materials of rock and soil.’Kill Element’ command is used to simulate the situation of exploiting,and then the command of ’Activate Element’ in ANSYS is used to simulate that the mined-out area is filled.The influence of each factor in the ground settlement over mined-out area is studied respectively such as depth,thickness of the mined-out area,the topographic condition and the filling of the mined-out area.The result shows that the ground settlement decreases with the increase of the mining depth,the ground settlement increases obviously with the increase of mining thickness,the basin movement will move to the lower direction with the change of topographty,and it will reduce the ground settlement evidently to fill the mined-out area in time after mining.更多还原