煤岩单轴压缩氡析出特性试验研究

Experimental study on the characteristics of radon emission from coal and rock under uniaxial compression

煤岩破裂伴随氡析出特性变化,通过观测煤、岩破裂过程氡析出规律有利于揭示煤岩动力灾害机理及其前兆特征。论文利用自行设计的受载岩石破裂过程氡析出测量试验系统,研究了煤岩单轴压缩氡析出规律。结果表明,煤岩试样单轴压缩不同加载阶段的氡析出特征具有显著差异。试样加载初期(孔隙/裂隙压密阶段),氡析出较原始状态大幅增加;试样加载中期(弹性变形阶段),氡析出较加载初期明显回落;试样加载后期(塑性变形阶段),氡析出较原始状态进一步增加;试样破裂后,煤样和岩样的氡浓度较原始水平分别增加了约91%和83%。

Coal and rock failure is associated with changes in characteristics of radon emission.The observation of laws of radon emission from the coal and rock failure process is helpful to reveal the dynamic disaster mechanism of coal and rock and its precursor characteristics.In this paper,the emission laws of radon emission from coal and rock under uniaxial compression was studied through a self-designed radon emission measurement test system in loading rock failure process.The results have shown that significant differences exist in the characteristics of radon emission from the coal and rock specimens under uniaxial compression in different loading phases.In the early phase of sample loading（the stage of pore/fissure compression）,the radon emission increases significantly from its initial state.In the middle phase of sample loading（the stage of elastic deformation）,the radon emission drops markedly compared with that of the early loading phase.In the late phase of sample loading（the stage of plastic deformation）,the radon emission further increases from its initial state.After sample failure,the radon concentration of the coal sample and rock sample increases by about 91% and 83% respecttively from its initial level.