摘要
在传统直流电法超前探测施工中,通过三个不同位置的电极对地供电,测量巷道后方一段距离内电位差,由此得到迎头前方电阻率变化的一维结果。由于一维解释结果具有不确定性,为此提出了一种基于钻杆供电的二维反演方法:即将迎头前方三维空间以柱坐标形式剖分,建立前方特定区域电阻率与测量异常电位差的近似线性关系,根据不同钻进深度测量值构建反演代数方程组,通过解方程快速反演以获取前方电阻率的二维分布。采空区模型与陷落柱超前探测快速反演以及实例表明,钻杆供电直流电法超前探测快速反演方法能比较准确反映异常电阻率在两个方向的方位信息,提高反演结果的准确性。
In traditional DC electric advanced prospecting,the power supply is through three electrodes in different positions to excite current into the earth.To measure potential difference within a distance behind the roadway,thus obtains one-dimensional result of front resistivity variation.Since the one-dimensional interpreted result has uncertainty,a 2D inversion method based on drill stem power supply put forward.That is subdivided front 3D space in cylindrical coordinate form,and established an approximate linear relationship between specially designated front area resistivity and measured abnormal potential difference.According to measured different drilling depth value to structure inversion algebraic equations,through equation solving fast inversion obtains front resistivity 2D distribution.Worked-out area model,subsided column advanced prospecting fast inversion and examples have shown that the drill stem power supply DC electric advanced prospecting fast inversion method can reflect position information of abnormal resistivity in two directions relatively exact,and improve inversion result accuracy.
作者
刘磊
Liu Lei(Xi’an Research Institute,China Coal Technology&Engineering Group Corp,Xi’an,Shaanxi 710077)
出处
《中国煤炭地质》
2018年第4期64-69,共6页
Coal Geology of China
基金
陕西省自然科学基础研究项目(2016JM4007)
关键词
直流电法
超前探测
钻杆供电
二维快速反演
DC electric method
advanced prospecting
drill stem power supply
2D fast inversion
