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截止目前,矿床评价仍以勘探剖面图和水平断面图为基本依据。倘若这些图件所反映矿体的形态,厚度、品位是正确的,那么评价就将趋于真实。然而,由于钻探施工中不可避免地倾角和方位角偏移,势必导致实际见矿点位偏离设想位置(即见矿点既不在设计剖面上,也不在应控制的水平断面上)。为了把实际见矿点重新反映在剖面和水平断面上,产生了目前使用的各种投影法和计算法。现行投影法和计算法从原理上可归纳为两类:一种是法线投影法;另一种是走向及倾向投影法。法线投影法的弊病所在,早已为某些研究者所揭示。这一方法机械地对见矿点进行垂直投影。当矿体不严格垂直可投影的平面时,必然导致矿体形态失真(如图1所示:实际见矿
Up to now, the deposit evaluation is still based on exploration profile and horizontal section. If these maps reflect the morphology, thickness and grade of the ore body is correct, then the evaluation will tend to be true. However, due to the unavoidable dip and azimuthal deviation in drilling construction, it is inevitable that the actual seepage point will deviate from the expected position (ie see the ore point neither in the designed section nor in the horizontal section to be controlled). In order to see the actual mine point re-reflected in the profile and horizontal section, resulting in the use of a variety of projection methods and calculation methods. The current projection method and calculation method can be summarized in principle into two categories: one is the normal projection method; the other is the trend and projective projection method. The drawbacks of the normal projection method have long been revealed by some researchers. This method mechanically see the mine point vertical projection. When the ore body is not strictly perpendicular to the projection plane, it will inevitably lead to ore body morphological distortion (as shown in Figure 1: the actual see mine