变电站下伏采空区安全稳定性分析
Safety and stability analysis of mined-out area underlying substation
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摘要: 针对河南省平顶山市拟建变电站的安全稳定性问题，以变电站下伏采空区为研究对象，在明确变电站下伏采空区基本地质条件及开采情况的基础上，综合采用瞬变电磁法及钻孔探测对其进行研究；通过分析瞬变电磁探测得到的视电阻率纵向剖面和地层深度与视电阻率关系曲线可知在部分深度范围内存在低阻异常区域，分析视电阻率水平剖面进一步确定低阻异常区域的水平范围；由钻孔探测得到的钻孔深度与岩心率关系曲线可以准确确定较破碎岩层的深度范围。综合分析2种探测结果可确定采空区异常区域位于拟建区域的偏西部，变电站下伏采空区的安全稳定性存在不确定因素，为保证其能够安全稳定运营需采取有效的采空区治理措施。Abstract: Aiming at the safety and stability issues of the proposed substation in Pingdingshan City, Henan Province, the substation was taken as the research object. Based on the basic geological conditions and mining conditions of the substation, the goaf was detected comprehensively the transient electromagnetic method and drilling detection. By analyzing the longitudinal profile of apparent resistivity obtained by transient electromagnetic detection and the relationship curve between formation depth and apparent resistivity, it could be seen that there are low resistance anomalies in some depths. The horizontal range of the low-resistance anomaly area was further determined by analyzing the horizontal profile of apparent resistivity. The relationship between the drilling depth and the core rate obtained by drilling detection could accurately determine the depth range where the rock formation is relatively broken and has a small amount of water leakage. It could be determined that the abnormal area of the mined-out area is located in the west of the proposed area according to the comprehensive analysis of the two detection results, and there are uncertain factors in the safety and stability of the mined-out area underlying the substation, and effective mined-out area governance measures must be taken to ensure the safe and stable operation of the substation.
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