关岩土参数的统计计算方法,GB50021—2001《岩土工程勘察规范》引入了随机场理论,得到母体空间均值在置信水平1-α下的单侧置信界限,并采用标准值表述之。但是由随机场理论方法尚未完全实用化,故而采用了近似简化公式,最终使得标准值的计算公式与规范一致。同时为了方便使用,避免误用学生氏分布表,规范对修正系数计算式进行了拟合简化。本文从经典的随机变量理论出发,采用统计学中的参数估计理论,阐述了岩土参数标准值计算公式的来,并讨论了修正系数的拟合简化计算式的合理性,同时提出了新的更为合理的拟合公式。%On the statistical calculation method of the geotechnical parameters in Norm for Investigation of Geo-technical Engineering (GB50021-2001), the paper introduced random field theory, got the average confidence lim-its under the confidence level of 1-α and used the standard value to express it. But because the random field theory has not yet been completely practical, a simplified formula for calculating the standard value was used, making the calculation formula consistent with the original norm. At the same time, in order to facilitate the use and avoid the misuse of student's distribution table, the norm carried out fitting and simplification of the calculation formula of the modified parameters. The paper, from the classical random variables theory, using statistical parameters in the estimation theory, discribed the standard value of the modified calculation formula, discussed the correctness of the simplified calculation formula, and puts forward the new and more reasonable fitting formula.
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