(長沙礦山研究院， 長沙 410012)
摘 要: 應(yīng)用分形幾何方法，對室內(nèi)巖石試樣及礦山頂板冒落前后的聲發(fā)射參數(shù)進(jìn)行分析，尋求頂板冒落過程中聲發(fā)射參數(shù)的分形特性，用分維來研究巖體失穩(wěn)的聲發(fā)射規(guī)律。研究結(jié)果發(fā)現(xiàn)：采場頂板巖體冒落前的聲發(fā)射參數(shù)(C、E )分布符合分形，不同類型的巖體雖然失穩(wěn)前分維 D 大小不同，但表現(xiàn)出相同的規(guī)律性，即頂板處于相對穩(wěn)定期時(shí)，分維值上升，當(dāng)聲發(fā)射參數(shù)達(dá)到臨界狀態(tài)時(shí)，分維值開始下降，分形維隨巖體破壞的發(fā)展而減小，特別是最低的分維產(chǎn)生于巖體破壞災(zāi)害附近。
關(guān)鍵字: 分維 聲發(fā)射 采場頂板 失穩(wěn)
（Changsha Institute of Mining Resarch, Changsha, 410012）
Abstract:Acoustic emission(AE) parameters, measeured from rock speciments in laboratory and monitored from stopes before/after roof collapses , were studied by using fractal geometric method, so as to investigate their fractal characteristics during the rock failure process. Meanwhile the AE rules governing rock mass destabilization were investigated through fractal dimension study. The research results indieated that the fractal dimension values of the stope roof rock-mass before suddenly collapsing exibit certatin regularity which can be used to evaluate the stability of the rock in stoping and excavation more scientifically, and to predict the activation of rock pressure in mining and excavation processes.
Key words: fractal dimension AE roof destabilization
