深部开采地表沉陷规律模拟研究

Simulating research on rules of surface subsidence due to deep mining

通过对煤矿深部开采沉陷的结构力学模型研究,提出了盆地水平煤层地表沉陷的理论预测模型,给出了整体和分步两种近似计算方法。在变动煤层开采深度和工作面长度的条件下,采用数值模拟方法对相关的数据进行了拟合计算对比,并基于现场沉陷观测数据对模型进行了验证。新模型方法结合力学模型计算得出开采沉陷预计参数,可以针对上覆岩层的力学参数对所得预测数据给出合理的力学解释,摆脱了经典预计模型概率积分法只依靠统计方法预测结果的缺陷,可为深部安全开采和地表沉陷的预测与控制,提供可靠的科学依据。

Through the research of structural mechanical model of the coal deep mining subsidence,the theoretical prediction model for the basin horizontal coal mining subsidence was put forward with two approximate calculation methods of whole and step.Using numerical simulation by changing the depth of coal mining and the length of working face,the related data were compared by fitting calculation with field subsidence monitoring measurement.The new proposed method can calculate the parameters of predicting mining subsidence based on the structural mechanical model,give a reasonable mechanical description against the predicted data with the overlying rock strata mechanical parameters,and overcome the shortcomings of the classical model of probability integration method relied only on the statistical method to predict mining subsidence;so as to provides a reliable scientific basis to predict and control the deep safe mining and the surface subsidence.