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钻孔弯曲的偏斜距离(以下简称孔斜偏距)是评定钻孔质量的重要指标之一。孔斜偏距以与设计穿切点同深的实际钻孔孔深点到设计轴线的垂直距离来衡量(“岩心钻探规程”第三十七条)。通常把这个与设计穿切点同深的实际钻孔孔深点称为孔斜评定点。每个钻孔都有一个或几个这样的评定点。只有每个评定点的孔斜偏距都不大于规程的允许值,才能确认该孔孔斜是合格的。因此,对孔斜偏距应准确计算。还须把孔斜偏距的概念推广到各测斜点,因为只有把各测斜点的孔斜偏距求出并将其大小与变化趋势展示在图上,更易于指导施工。
Drilling bending deflection distance (hereinafter referred to as oblique hole offset) is to assess the quality of the drilling one of the important indicators. Hole skew offset is measured as the vertical distance from the actual drill hole depth to the design axis as deep as the cut point of the design (Core Drilling Code, Article 37). This design hole is usually the same point with the depth of the actual drill hole deep hole called hole oblique evaluation point. Each hole has one or more of these points. Only the hole offset of each evaluation point is not greater than the allowable value of the procedure to confirm that the hole inclination is acceptable. Therefore, the deviation of the hole should be accurately calculated. The concept of oblique inclination of the hole must also be generalized to each of the measured oblique points because only the inclination of the oblique points of each of the measured points is determined and its size and trend of change are shown in the figure to make it easier to guide the construction.