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在岩石露头上,特别是在探槽新揭露的新鲜露头或坑道壁上,测定岩矿石的电性参数,比室内在标本上测定,能获得较为真实的数值.本文对露头上测定电参数的技术条件,包括电极装置和边界影响进行了讨论. 露头测定所用装置的选择从电法勘探基础理论可知,当地下半无限空间充满了均匀各向同性介质(其电阻率为ρ_1,极化率为η_1)时,无论采用何种装置,所测得的视电阻率ρ_s和视极化率η_s的值就是它们的真实值(ρ_1和η_1). 四极(此处指对称四极装置)、三极以及二极装置都可用在露头上进行小极距的测深,或小极距的剖面测量,以获取露头的ρ及η值.三种装置计算电阻率的公式在一般电法勘探的教科书中均可查到,其极化率计算公式就是其二次电位与
On the rock outcrops, especially on the fresh outcrops or tunnel walls newly exposed in the trenches, the electrical parameters of the rock ores can be determined more accurately than those measured indoors, so the more realistic values can be obtained.In this paper, The technical conditions, including the electrode device and the influence of the boundary, are discussed.The selection of the device for outcrop determination We can see from the basic theory of electrical prospecting that the local lower half of the infinite space is filled with homogeneous isotropic medium (resistivity ρ_1, polarizability η_1), the measured apparent resistivities ρ_s and apparent polarizations η_s are their true values (ρ_1 and η_1) regardless of the device used. The quadrupoles (here referred to as symmetrical quadrupole devices), the tris Both polar and bipolar devices can be used for out-of-the-spot measurements of small polar depths or small polar cross-sectional measurements for ρ and η outcrops. The formulas for calculating the electrical resistivity of the three devices are found in the textbook Can be found in its polarizability formula is its secondary potential and