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本文提出由单个垂直或倾斜钻孔取得定向岩心以确定岩层或矿体产状要素的图算法,所用工具是地质人员熟习的极射赤平投影网(吴氏网)。定向取心对地质构造和岩组分析有很大意义。对于产状稳定的层状或似层状岩矿层,不取定向岩心,利用单个倾斜钻孔取出的普通岩心确定产状要素,这个问题已得到解决(《矿山技术》,1977年,第二期)。下面扼要举例说明。如图1所示,钻孔与地层同倾向,地层倾角β=40°,钻孔二测程顶角θ_1=20°,θ_2=30°,方位变化△α=0,迂层角(轴心夹角)的通式γ=90°-β-θ,γ_1=90°-β-θ_1
This paper presents an algorithm for obtaining directional cores from a single vertical or inclined borehole to determine the origin of rock or ore bodies. The tools used are polar stereographic projection nets familiar to geologists. Directional coring is of great significance for the analysis of geological structures and rock groups. For stratiform or stratified rock and rock formations that are stable in shape, the problem of producing elements is determined using conventional core removed from a single inclined borehole without directional cores (Mine Technology, 1977, no. 2 ). The following brief examples. As shown in Fig. 1, the borehole is the same as the stratum. The stratum dip β = 40 °, the dip angle of the borehole two geodesic θ_1 = 20 °, θ_2 = 30 °, azimuth change △ α = 0, Angle) γ = 90 ° -β-θ, γ_1 = 90 ° -β-θ_1