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从列昂托夫斯基的三个传统公式到沈忠悦的一个通用公式,使岩层真厚度计算简便得多。但沈氏公式中带有绝对值,所以当连续测量地层剖面而进行厚度累计时容易出错。虽然文朴、徐开礼讨论了负厚度问题,但仍需人工选择不同公式计算或判断正负号,甚至出现文中规定的正负号变换原则与实际情况相矛盾的情形。由此可见,岩层真厚度计算的关键问题乃是厚度值的正负问题,即负厚度的识别和负号的应用。笔者等曾规定,导线从岩层下层面往上层面方向前进时所控制的岩层厚度为正厚度,导线从岩层上层面往下层面方向前进时所控制的厚度为负厚度,并在沈忠悦公式的基础上,根据岩层面法线与导线之情况相符,选择的参数可直接取自野外实测数据,避免了过程性人工换算环节。
From the three traditional formulas of Leonovsky to the one of Shen Zhongyue, the true thickness of the rock formation is much easier to calculate. However, the Shen formula has an absolute value, so it is easy to make mistakes when continuously measuring the thickness of the stratigraphic section. Although Wen Park and Xu Kai-li discussed the issue of negative thickness, they still need to manually select different formulas to calculate or judge the sign, or even the contradiction between the sign principle and the actual situation as stipulated in the article. Thus, the key issue in true rock thickness calculation is the positive and negative value of the thickness, that is, the identification of negative thickness and the application of negative sign. The author once stipulated that the thickness of the strata to be controlled when conducting wires proceeding from the lower level of the strata to the upper strata should be positive and the thickness controlled by the conductor going forward from the upper strata to the lower strata of the strata should be negative. Based on the basis of Shen Zhongyue formula According to the normal of the rock plane and the wire, the selected parameters can be directly taken from the field measured data to avoid the process of artificial conversion.