基于K-Means模糊聚类的采场覆岩运移微震能量簇时空分析

Spatial-temporal analysis of microseismic energy cluster in overlying rock migration based on K-Means fuzzy clustering

煤矿冲击地压以及顶板强来压成因多而复杂,且难以与冲击启动和显现能量建立量化关系。很难建立力学模型通过理论计算实现精准预警监测。为探究煤矿冲击地压启动机理问题,提出了基于模糊聚类数学语言和微震能量事件实测数据的冲击地压数据分析模型。该模型通过借助K-Means模糊数学分析方法对记录的微震事件按照事件和空间的属性进行分类,在构造模糊矩阵后,迭代入质心隶属度公式将微震事件数据集分成若干簇,最小化冲击事件类间相似性,最大化类内相似性。通过计算分析确定采场巷道记录的微震事件多为覆岩结构周期性拉伸破断和工作面推进至“见方”时的复合型结构失稳,当破断结构为基本顶组成的大结构时,事件能量级数较高。结果表明,模糊聚类分析结果较为准确,基于该分析模型可对煤矿冲击地压进行预警并为防冲工作提供理论指导及施工方案。

The causes of coal mine rock burst and strong roof weighting in coal mines are numerous and complex,and it is difficult to establish a quantitative relationship with the impact initiation and apparent energy.It is difficult to establish a mechanical model to realize accurate early warning and monitoring through theoretical calculation.In order to explore the starting mechanism of rock burst in coal mines,a rock burst data analysis model based on fuzzy clustering mathematical language and measured data of microseismic energy events is proposed.The model classifies the recorded microseismic events according to the attributes of events and space by means of K-Means fuzzy mathematics analysis method.After constructing fuzzy matrix,the data set of microseismic events is divided into several clusters by iteration into centroid membership formula to minimize the similarity between shock events and maximize the similarity within the class.Through calculation and analysis,it is determined that the microseismic events recorded in the stope roadway are mostly the periodic tensile fracture of the overlying rock structure and the composite structure instability when the working face advances to the square.When the fracture structure is a large structure composed of the basic roof,the energy series of the event is high.The results indicate that the fuzzy clustering analysis results are relatively accurate,and based on this analysis model,early warning of coal mine rockburst can be provided,providing theoretical guidance and construction plans for anti erosion work.