高密度电阻率法在太行山北段铁矿采空区勘查中的应用

Application of high density resistivity method in exploration of goaf of iron deposit in North Taihang Mountain

为查明保定市徐水区云寨顶重要建(构)筑物下部小窑采空区的分布情况,为后续采空区治理提供基础资料,开展本次工程物探研究工作。通过高密度电阻率法及现场调查,对徐水区云寨顶开采铁矿形成的小窑采空区进行勘查。勘查成果表明,云寨顶铁矿小窑采空区电阻率值明显高于围岩,在高密度电法电阻率反演断面图上表现为椭圆状高电阻率异常。经现场调查,解译推断的小窑采空区位置与已知采空区位置对应,高密度电阻率法在铁矿小窑采空区勘查中具有很高的可实施性。此外,降水沿所揭露裂隙破碎带渗流后,形成局部极低阻异常,上部的构筑物受小窑采空区和裂隙破碎带双重影响变形开裂。

In order to find out the distribution of the small kiln goaf under the important buildings in Yunzhaiding area of Xushui District,Baoding City,and to provide basic data for the treatment of the goaf,the engineering geophysical exploration research of this project is carried out.Through high-density resistivity method and field investigation,the small kiln goaf formed by iron ore mining in Yunzhaiding area is explored.The exploration result indicates that the resistivity value of the small kiln goaf in Yunzhaiding iron deposit is significantly higher than that of the surrounding rock,and it shows an elliptical high resistivity anomaly in the high-density electrical resistivity inversion cross-section.After on-site investigation,the inferred location of the small kiln goaf corresponds to the known goaf location.The high-density resistivity method has high feasibility in the exploration of the small kiln goaf in iron deposit.In addition,after the precipitation seeps along the exposed fracture zone,local extremely low resistance anomaly is formed,and the upper buildings are deformed and cracked due to the dual influence of the small kiln goaf and fracture zone.