摘要
矸石充填开采可以降低采空区顶板垮落的可能性,并对地表沉陷变形起到关键控制作用。为了更简便准确的评估矸石充填后的效果,以新元煤矿为工程背景,首先概述了矸石充填设备的选型,考察了充填后的三个工作面的充实率,之后模拟计算了地面沉陷量,并通过现场实测来验证模拟结果。最后结合相关变形指标初步评估了该煤矿矸石充填开采对地表建筑物的影响。结果表明:新元煤矿三个工作面充填开采后的最大充实率为73%,最小则为36%;数值计算的地表沉陷量曲线与实测数据点相匹配,证明了模拟工作的可信度;模拟出来的三个工作面的可能最大地表水平变形值为0.15mm/m,可能最大地表倾斜变形值为0.35mm/m,可能最大地表曲率值为0.0022mm/m^(2);上述这些变形参数均小于相关的Ⅰ级变形指标,证明了矸石充填开采后对地面建筑物等的影响是非常小的。通过此数值模拟的方法提前对矸石充填开采引起的地表变形进行合理预测与评估是可行的。
Gangue filling mining can reduce the possibility of roof collapse in goaf and play a key role in controlling surface subsidence deformation.In order to evaluate the effect of gangue filling more easily and accurately,taking Xinyuan Coal mine as the engineering background,the selection of gangue filling equipment was summarized firstly,the filling rate of three working faces after filling was investigated;then,the ground subsidence was calculated using numerical software,and the simulation results were verified by field measurement;finally,the influence of gangue filling mining on the surface buildings is preliminarily evaluated based on relevant deformation indexes.The results show that the maximum filling rate of Xinyuan Coal Mine after filling mining is 73% and the minimum is 36%;the surface subsidence curve calculated by numerical method matches the measured data points,which proves the reliability of simulation work;the maximum possible surface horizontal deformation value of the three simulated working surfaces is 0.15 mm/m,the maximum possible surface tilt deformation value is 0.35 mm/m,and the maximum possible surface curvature value is 0.0022 mm/m^(2).These deformation parameters are all smaller than the relevant grade-I deformation index,and the effect of gangue filling mining on ground buildings is non-significant.It is feasible to predict and evaluate the surface deformation caused by gangue filling mining in advance using this numerical simulation method.
作者
徐慧刚
XU Hui-gang(Xinyuan Coal Co.,Ltd.,Yangquan 045000,China)
出处
《煤炭工程》
北大核心
2022年第3期131-135,共5页
Coal Engineering
关键词
充填开采
矸石
设备选型
地表沉陷
变形指标
filling mining
gangue
equipment selection
surface subsidence
deformation index