1.1 本规程描述了从矿井煤层工作面上下延伸的通道中采集煤样的程序。 1.2 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 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、健康和环境实践，并确定监管限制的适用性。 有关具体预防信息，请参阅 注释2 . 1.4 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====== 4.1 包括总煤层间隔的正确采集的工作面通道样本提供了一个样本，该样本是采样点煤层的代表性横截面。 采集通道样本进行后续测试，以评估煤质和表征商业评估，规划采矿作业以保持煤质，并根据分类确定煤级 D388页 ，用于地质煤炭资源研究。 注1: 由于可能存在横向变化，一个样本可能无法代表另一个样本点的煤层质量。通道样本生成的数据的可靠性取决于样本点的数量和间距以及给定区域内煤炭特征的可变性。 注2: 由于产品受到煤层外材料的污染、煤层部分的选择性开采、无法从矿井中的一个或多个特定位置获得样品，或采样目的与采矿实践不兼容，因此，出于这些目的对矿产品进行采样并不令人满意。相反，渠道样本不应用于评估矿山产品商业运输的质量，应根据方法进行采样 D2234/D2234M .

1.1 This practice describes procedures for collecting a coal sample from a channel extending from top to bottom in the face of a coal seam in a mine. 1.2 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautionary information, see Note 2 . 1.4 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 ====== 4.1 A properly collected face channel sample that includes the total coal bed interval provides a sample that is a representative cross section of the coal bed at the point of sampling. Channel samples are taken for subsequent testing needed for evaluation of coal quality and characterization for commercial evaluations, for planning of mining operations to maintain coal quality, for the determination of coal rank in accordance with Classification D388 , and for geologic coal resource studies. Note 1: Because of the potential for lateral variability, a sample may not represent the quality of the coal bed at another sample point. The reliability of the data generated from channel samples is dependent on the number and spacing of the sample points and the variability of the coal characteristics in a given area. Note 2: Sampling of the mine product for these purposes is unsatisfactory because of contamination of the product with out-of-seam material, selective mining of parts of a seam, inability to obtain samples from one or more specific locations in the mine, or other incompatibility of the purpose of sampling with the mining practice. Conversely, channel samples should not be used for evaluation of the quality of commercial shipments of the mine product, which should be sampled in accordance with Methods D2234/D2234M .