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开采诱发的冲击地压活动与区域应力场之间存在着密切相关关系,为探究冲击地压孕育过程中相关区域岩体内部应力场的演化机制及灾害发生前兆信息,研究将钻孔应变观测技术首次应用到矿山动力灾害监测中,并采用分形盒维数定量分析钻孔应变数据时程变化特征及其与冲击地压的相关关系。结果表明,钻孔应变观测技术应用到矿山动力灾害监测中,可直接、准确地记录冲击地压发生前后区域内岩体的应变微动态变化过程;运用分形方法处理具有固体潮趋势背景的钻孔应变数据简单而有效,分形盒维数可量化评价应变数据的复杂变化和固体潮畸变异常程度;钻孔应变数据的分形盒维数时程变化,定量表征了冲击地压的非线性时空演化过程,可将盒维数的“升高→降低”变化作为冲击地压发生的前兆判据。
In order to explore the evolution mechanism of internal stress field and the precursory disaster information of rock mass in the relevant area during the process of rockburst inoculation, this paper studied the relationship between drilling strain observation technology It is applied for the first time to mine dynamic disaster monitoring. The fractal box dimension is used to quantitatively analyze the time-history characteristics of borehole strain data and its correlation with rock burst. The results show that the application of borehole strain observation technology to the monitoring of mine dynamic disasters can directly and accurately record the micro-dynamic changes of rock mass in the area before and after the rockburst; and the fracturing method can be used to deal with the borehole with trend of solid tide The strain data are simple and effective. The fractal box dimension can be used to quantitatively evaluate the complex changes of strain data and the degree of anomalies of solid tide distortion. Fractal dimension of borehole strain data changes with time course, and quantitatively characterizes the nonlinear spatio-temporal evolution of rockburst , The change of “increasing → decreasing” of box dimension can be used as a precursor of rockburst.