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关于从斜钻孔中取芯计算岩层真厚度的方法,朱显芝同志早在《中国地质》1964年第4期上发表过《关于斜钻孔矿层或岩层真厚度计算方法的商榷》一文,提出在直孔中计算岩层真厚度的简便公式,即岩层厚度等于岩层假厚度乘岩芯倾角余弦值的公式,可以通用于斜孔。也就是说,斜孔中计算岩层真厚度,用不着采用前人的一些烦琐公式。嗣后,《地质论评》1965年第23卷第6期、《地质与勘探》1975年第5期相继刊登过类似文章。此外,该公式并编入《地质常用计算手册》等书。因此,据了解,长期以来该公式已为很多地质工作者所熟悉和采用。但最近有读者反映,由于《煤田地质勘探编录》中又引用了过去的比较烦琐的公式,从而引起了一些同志产生无所适从之感。现王仲三同志用简明的几何方法,进一步论证了简便公式的通用性、准确性,特予刊登,供读者参考。
As for the method of calculating core true thickness from cored hole, Comrade Zhu Xianzhi published an article entitled “Discussion on Calculation Method of Diameter Bored Strata or True Thickness of Rock” as early as “China Geology”, No. 4, 1964, A straightforward formula for calculating the true thickness of a rock formation in a straight hole is that the rock thickness equals the cosine of the rock thickness and can be generalized to a slant hole. In other words, slant hole to calculate the true thickness of the rock, do not need to use some of the cumbersome formula of the predecessor. Subsequently, “Geological Review” 1965 Volume 23 No. 6, “Geology and Exploration” 1975 the fifth have published a similar article. In addition, the formula and incorporated into “Geological Calculation Manual” and other books. Therefore, it is understood that this formula has long been familiar and adopted by many geotechnical workers. Recently, however, some readers have reported that as a result of the quotation of the past cumbersome formula in the Coalfield Geological Exploration Catalog, some comrades have been given a feeling of being at a loss. Comrade Wang Zhongsan, with concise geometric methods, further demonstrate the versatility and accuracy of simple formulas and give special reference to readers.