1.1本规程旨在促进记录涉及岩土数据的测量值和计算值的有效数字的一致性。本指南为行业标准，代表了通常应保留的有效数字。指南不考虑材料变化、获取数据的目的、特殊目的研究或用户目标的任何考虑因素；通常的做法是增加或减少报告数据的有效位数，以与这些考虑因素相称。考虑工程设计分析方法中使用的有效数字超出了本实践的范围。 1.1.1在岩土数据中使用有效数字涉及收集、计算和记录测量值或计算值（结果）或两者的过程。 1.2本规程接受传统舍入方法的变体，该方法识别大多数手持式计算器通用的算法，请参阅 5.2.3 . 传统的舍入方法（参见 5.2 )符合规程E29或IEEE/ASTM SI 10。 1.3 本实践提供了一组用于执行一个或多个特定操作的说明。本文件不能取代教育或经验，应与专业判断一起使用。并非本惯例的所有方面都适用于所有情况。本ASTM标准不代表或取代必须根据其判断给定专业服务的充分性的谨慎标准，也不应在不考虑项目的许多独特方面的情况下应用本文件。 标题中的“标准”一词仅表示该文件已通过ASTM共识程序获得批准。 ====意义和用途====== 4.1使用机构或用户可采用本实施规程中提出的保留有效数字和舍入数的指南。通常，当标准中未包含规定要求时，应采用它们来计算和记录数据。 4.2本指南不应解释为绝对规则，而应解释为在不夸大或降低数值准确性的情况下计算和报告观察或测试数据的指南。 4.2.1提供的指南强调记录数据到足够的有效数字或小数位数，以便进行灵敏度和可变性分析，请参阅 3.2 .

1.1 This practice is intended to promote uniformity in recording significant digits for measured and calculated values involving geotechnical data. The guidelines presented are industry standard, and are representative of the significant digits that should generally be retained. The guidelines do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user's objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this practice to consider significant digits used in analysis methods for engineering design. 1.1.1 Using significant digits in geotechnical data involves the processes of collecting, calculating, and recording either measured values or calculated values (results), or both. 1.2 This practice accepts a variation of the traditional rounding method that recognizes the algorithm common to most hand-held calculators, see 5.2.3 . The traditional rounding method (see 5.2 ) is in accordance with Practice E29 or IEEE/ASTM SI 10. 1.3 This practice offers a set of instructions for performing one or more specific operations. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project’s many unique aspects. The word “Standard” in the title means only that the document has been approved through the ASTM consensus process. ====== Significance And Use ====== 4.1 The guidelines presented in this practice for retaining significant digits and rounding numbers may be adopted by the using agency or user. Generally, their adoption should be used for calculating and recording data when specified requirements are not included in a standard. 4.2 The guidelines presented herein should not be interpreted as absolute rules but as guides to calculate and report observed or test data without exaggerating or degrading the accuracy of the values. 4.2.1 The guidelines presented emphasize recording data to enough significant digits or number of decimal places to allow sensitivity and variability analyses to be performed, see 3.2 .