1.1 该测试方法包括确定岩石质量指标（RQD）作为岩芯样本钻孔岩芯测井的标准参数，以及通常获得的岩芯回收率值（实践 D2113 ); 然而，不同学科之间可能存在一些差异，例如采矿和土木工程。 1.2 本标准不包括通过其他钻孔方法（如声学或光学遥视仪）进行的任何RQD测定，这些方法可能不会提供与实际岩芯样品相同的数据或结果。 1.3 有许多钻井和岩性变化可能会影响RQD结果。本标准提供了许多常见和一些异常情况的示例，本标准的用户需要了解这些情况才能使用本标准，并且不能期望它涵盖所有钻井和测井场景。目的是为用户提供一个示例基线，以获得所有权，并在其特定钻井计划中观察类似、额外或独特的地质和程序问题。 1.4 本标准使用D.U.Deere的原始计算方法来确定RQD值，不包括其他计算或分析方法；比如蒙特卡洛。 1.5 本试验方法中的RQD仅表示由试验程序定义的岩芯间隔内完整和完好岩石的百分比，并且仅表示特定位置处沿钻孔轴线方向的岩体的百分比。岩芯层段通常是一段岩芯，但可以是岩性单元或与项目相关的任何其他岩芯样本层段。 1.6 RQD最初用于直径为54.7 mm（2.155 in.）的N尺寸岩心的常规钻孔。然而，该测试方法涵盖了从BQ到PQ的所有类型的岩芯桶和岩芯尺寸，只要使用了不会导致岩芯过度破碎或回收率低或两者兼有的适当钻井技术，这些岩芯桶和岩芯尺寸通常可用于测量和确定RQD。看见 6.3 有关此问题的更多信息。 1.7 只有与Deere提出的常见隧道分类相关的RQD分类 2. , 3. 包含在本试验方法中。其他分类系统未具体涵盖，但在一般情况下提及，如果使用，不应视为不符合本标准。 1.8 所有观察值和计算值应符合实践中确定的有效数字和舍入准则 D6026 . 1.8.1 本标准中用于指定数据收集、计算或记录方式的方法与数据在设计或其他用途中或两者中的应用精度没有直接关系。 如何应用使用本标准获得的结果超出了其范围。 1.9 以国际单位制或英寸-磅单位表示的值[括号中给出了合理值]应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。以国际单位制以外的单位报告试验结果不应视为不符合本标准。 1.10 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 1.11 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 RQD于20世纪60年代中期首次引入，以提供简单且廉价的岩体质量一般指示，以预测隧道条件和支护要求。自那时以来，RQD记录实际上已成为各种岩土勘探的钻孔岩芯测井的标准做法。 5.2 RQD值的使用范围已经扩大，为初步设计和施工能力决策提供了依据，涉及结构基础、隧道、露天矿和许多其他应用的开挖。 RQD值也可用于识别与岩石地基承载力、沉降、侵蚀或滑动相关的潜在问题。RQD可以为涉及混凝土骨料、堆石或大型抛石的问题提供采石场岩石质量指示。 5.3 RQD已被广泛用作低质量岩石区的警告指标，这些岩石区可能需要更严格的审查或需要额外的钻孔或其他调查工作。这包括有一定时间的岩石- 在良好控制的条件下，通过在24小时后再次测定RQD，可以帮助确定耐久性的相关质量。 5.4 RQD是许多岩体分类系统的基本组成部分，例如岩体评级（RMR）和Q系统，用于工程目的。看见 D5878 和 2. , 3. . 5.5 必要时，可以使用不同方向的钻孔来确定三维RQD。 5.6 RQD的概念也可以使用测线法在任何岩石露头或开挖面上使用。 然而，本标准不包括该主题。 注2: 本标准产生的结果的质量取决于执行该标准的人员的能力，以及所用设备和设施的适用性。符合实践标准的机构 D3740 通常认为能够胜任和客观的测试/采样/检查等。本标准的用户应注意遵守惯例 D3740 本身并不能保证可靠的结果。 可靠的结果取决于许多因素；实践 D3740 提供了一种评估其中一些因素的方法。

1.1 This test method covers the determination of the rock quality designation (RQD) as a standard parameter in drill core logging of a core sample in addition to the commonly obtained core recovery value (Practice D2113 ); however there may be some variations between different disciplines, such as mining and civil projects. 1.2 This standard does not cover any RQD determinations made by other borehole methods (such as acoustic or optical televiewer) and which may not give the same data or results as on the actual core sample(s). 1.3 There are many drilling and lithologic variations that could affect the RQD results. This standard provides examples of many common and some unusual situations that the user of this standard needs to understand to use this standard and cannot expect it to be all inclusive for all drilling and logging scenarios. The intent is to provide a baseline of examples for the user to take ownership and watch for similar, additional or unique geological and procedural issues in their specific drilling programs. 1.4 This standard uses the original calculation methods by D.U. Deere to determine an RQD value and does not cover other calculation or analysis methods; such as Monte Carlo. 1.5 The RQD in this test method only denotes the percentage of intact and sound rock in a core interval, defined by the test program, and only of the rock mass in the direction of the drill hole axis, at a specific location. A core interval is typically a core run but can be a lithological unit or any other interval of core sample relevant to the project. 1.6 RQD was originally introduced for use with conventional drilling of N-size core with diameter of 54.7 mm (2.155 in.). However, this test method covers all types of core barrels and core sizes from BQ to PQ, which are normally acceptable for measuring determining RQD as long as proper drilling techniques are used that do not cause excess core breakage or poor recovery, or both. See 6.3 for more information on this issue. 1.7 Only the RQD classification which correlates with the common tunneling classification that was presented by Deere 2 , 3 is covered in this test method. Other classification systems are not covered specifically but are mentioned in general and if used shall not be regarded as nonconformance with this standard. 1.8 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.8.1 The method used to specify how data are collected, calculated, or recorded in this standard is not directly related to the accuracy to which the data can be applied in design or other uses, or both. How one applies the results obtained using this standard is beyond its scope. 1.9 The values stated in either SI units or inch-pound units [rational values are given in brackets] are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard. 1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.11 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The RQD was first introduced in the mid 1960s to provide a simple and inexpensive general indication of rock mass quality to predict tunneling conditions and support requirements. The recording of RQD has since become virtually standard practice in drill core logging for a wide variety of geotechnical explorations. 5.2 The use of RQD values has been expanded to provide a basis for making preliminary design and constructability decisions involving excavation for foundations of structures, or tunnels, open pits, and many other applications. The RQD values also can serve to identify potential problems related to bearing capacity, settlement, erosion, or sliding in rock foundations. The RQD can provide an indication of rock quality in quarries for issues involving concrete aggregate, rockfill, or large riprap. 5.3 The RQD has been widely used as a warning indicator of low-quality rock zones that may need greater scrutiny or require additional borings or other investigational work. This includes rocks with certain time-dependent qualities that by determining the RQD again after 24 h, under well-controlled conditions, can assist in determining durability. 5.4 The RQD is a basic component of many rock mass classification systems, such as rock mass rating (RMR) and Q-System, for engineering purposes. See D5878 and 2 , 3 . 5.5 When needed, drill holes in different directions can be used to determine the RQD in three dimensions. 5.6 The concept of RQD can be used on any rock outcrop or excavation surface using line surveys as well. However, this topic is not covered by this standard. Note 2: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.