频率信号激励下煤电性试验及其特征研究
Research on Coal Electrical Experiment Stimulated by Frequency Signal and Its Characteristics
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摘要: 对煤在频率信号激励下的复电性进行了测量。结果显示：不同煤种，振幅谱及相位谱各自呈现出不同的特征。试验频率范围0.1 Hz～100 kHz，测量结果为不同变质程度的煤样幅频特性Z-f整体趋势单调递减；不同煤种及岩矿石幅频曲线各不相同，拐点位置也不一样；各煤体相频曲线呈现不同的特征，相位一般为负值，煤体与岩石总体表现出容抗的性质,曲线形状及极值点位置也各不相同。根据在相同电性频率域下不同变质程度的煤种所表现出来的阻抗及相位的不同，分析其导电机理与其结构模型，为电法勘探提供理论支撑与试验基础。Abstract: Plural electrical property of coal was measured under frequency signal excitation. The results show that amplitude spectrum and phase spectrum of different kinds of coal respectively present different characteristics. In the test frequency range of 0.1 Hz to 100 kHz, Z-f curves of coals all show monotone decrease. The amplitude-frequency curves of different types of coal and rocks differ from one another, and inflection point positions are also different. Phase frequency curves of different coal and rocks present different characteristics. Phase is generally negative. Coal and rocks overall show the property of capacitive reactance. Curve shapes and extreme value point positions are respectively different. The amplitude frequency and phase frequency characteristics of coal and rocks were first analyzed. According to the differences of impedance and phase of coal in different metamorphic extent under the same electrical frequency domain, electricity exploration is used to prospect its compositions and structures, which provides theoretical and experimental basis for electric prospecting.
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