基于高密度电阻率法的多层采空区探测研究

Research on detection of multi-layer goaf based on high-density resistivity method

针对露天金属矿山在规模化开发利用中遇到的多层充水型采空区精准探测的技术难题,选取鞍山-本溪地区某典型的BIF型深凹露天铁矿为对象,以识别其内发育的多层充水型采空区异常为出发点,以多层充水型采空区的地球物理特征为依据,采用高密度电阻率法为探测技术手段,选用抗干扰能力较强的温纳装置,在露天铁矿+128 m采矿平台开展探测应用研究。研究成果表明:高密度电阻率法识别出了2处由采空区引起的地球物理异常,根据工程资料,其异常埋深分别在10~30 m和21~43 m之间,并确定为充水型采空区;高密度电阻率法对一定深度空间内的多层充水型采空区引起的异常具有较好的识别精度,对采空区顶板的裂隙发育程度也具有较好的识别效果。

Aiming at the technical difficulties of accurate detection of multi-layer water-filled goaf encountered in the large-scale development and utilization of open-pit metal mines,a typical BIF-type deep-concave open-pit iron ore in Anben area was selected as the object to identify the abnormality of the layered water-filled goaf as the starting point.Based on the geophysical characteristics of the multi-layer water-filled goaf,the high-density resistivity method is used as the detection technology,and the Wenner device with strong anti-interference ability is selected.In open-pit iron mine+128 m mining platform,we carry out detection application research.The research results show that the high-density resistivity method has identified two geophysical anomalies caused by the goaf.According to the engineering data,the abnormal burial depths are between 10~30 m and 21~43 m respectively,which are determined to be water-filled types goaf.The high-density resistivity method has good identification accuracy for the anomalies caused by the multi-layer water-filled goaf in a certain depth space,and also has a good identification effect on the development degree of cracks in the roof of the goaf.The safe mining of deep concave open-pit iron ore in the area provides theoretical basis and data support.