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为评价工程中条带开采方案的煤层整体稳定性,确定开采方案的安全程度,基于强度折减原理,应用FLAC3D数值模拟软件,将工程实际与数值实验相结合,研究煤层条带开采对地表沉陷、围岩变形和破坏的影响,用安全系数对安全程度进行评价。提出条带开采整体失稳的临界状态判断标准为采空区之间及采空区至地表岩体塑性区域连通,并以地表最大沉降和顶板最大位移突然增大作为临界状态判断标准的验证条件,结果表明:应用强度折减原理进行数值模拟确定的条带开采整体安全系数与工程实际相吻合。
In order to evaluate the overall stability of the coal seam in the strip mining scheme and to determine the safety of the mining scheme, FLAC3D numerical simulation software was used to combine the engineering practice with numerical experiments based on the strength reduction principle to study the effect of coal seam mining on surface subsidence , The deformation and destruction of surrounding rock, the safety factor is used to evaluate the safety level. The criterion for judging the critical state of the overall instability of strip mining is the connectivity between the mined-out area and the plastic zone of the mined-out area and the plastic zone of the rock mass, and the verification conditions of the criterion of the critical state are the maximum subsidence and the sudden increase of the maximum displacement of the roof The results show that the overall safety factor of strip mining determined by numerical simulation based on the strength reduction principle is consistent with the engineering practice.