综合物探方法在铁矿隐伏采空区充填效果评价中的应用研究

    Application of comprehensive geophysical prospecting method in the evaluation of filling effect of concealed goaf in iron mine

    • 摘要: 充填效果是采空区治理评价的重要指标。为研究物探方法在采空区充填治理效果评价方面的适用性,本文以淄博市某闭坑铁矿隐伏采空区为研究对象,应用可控源音频大地电磁法和微动测量进行时移数据观测,通过对采空区测量数据进行归一化、标准化处理,分析了采空区充填前后的电性特征和弹性波速特征及差异,提出了适合采空区充填效果评价的技术方法。研究结果表明,可控源音频大地电磁法解译结果能反映出充水采空区的范围及其充水通道,其中,充水采空区表现为封闭的低阻异常区,充水通道引起的低阻条带状异常与裂隙带富水有关;微动测量解译结果能清晰反映出充水采空区引起的低速异常范围,但充水通道反映不明显,两种物探方法在采空区位置探测中均有较好的适用性;受采空区充水影响,充填治理前后采空区均表现为低阻低速异常特征,但其弹性波速特征的差异较电性特征更为明显,异常分辨率也更清晰,微动测量方法在采空区充填治理效果评价方面的适用性优于可控源音频大地电磁法。

       

      Abstract: Filling effect is an important indicator of goaf treatment evaluation. In order to study the applicability of geophysical methods in goaf filling treatment effect evaluation, this paper takes a concealed goaf in a closed pit iron mine in Zibo City as the research object, and applies controlled source audio-frequency magnetotelluric method and fretting measurement to observe time-shift data. By normalizing and standardizing the measurement data of goaf, the electrical characteristics and elastic wave velocity characteristics and differences before and after goaf filling are analyzed, and a technical method suitable for goaf filling effect evaluation is proposed. The results show that the interpretation results of controlled source audio-frequency magnetotelluric method can reflect the range of water-filled goaf and its water filling channel, in which the water-filled goaf is a closed low-resistance abnormal area, and the low-resistance strip abnormal caused by water filling channel is related to the water-rich fissure zone. The interpretation results of fretting measurement can clearly reflect the range of low-speed abnormal caused by water-filled goaf, but the water filling channel is not obvious. Both of the two geophysical methods have good application effect in the range detection of goaf. Affected by the goaf water filling, the goaf before and after filling treatment exhibited the characteristics of low resistance and low velocity anomalies, but the difference of elastic wave velocity characteristics is more obvious than that of electrical characteristics, and the abnormal resolution is clearer. The applicability of fretting measurement method in the evaluation of goaf filling treatment effect is better than that of controlled source audio-frequency magnetotelluric method.

       

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