1.1 本标准中所述的测试方法用于测量垂直深基础构件的深度，包括微型桩、打入桩（预制或现浇）、钻孔桩、割线或切线桩墙、沉箱、插板、地下连续墙和板桩墙。它适用于上述基础构件（以下也称为“桩”）顶部无法暴露用于测试和其他测试方法（如ASTM）的情况 D5882 或 D6760 无法使用。 1.2 本标准规定了测量深基础深度的最低要求。计划、规范和/或规定可提供满足特定测试计划目标所需的额外要求和方法。 1.3 本标准提供了以下试验方法: 1.3.1 方法“A”使用与深基础相邻的垂直接入管。 1.3.2 方法“B”，使用插入深基础附近地面的地震锥。 1.4 此处指定为“可选”的装置和方法可能会产生不同类型的测试结果或附加信息，并且只能在负责测试的工程师批准后使用。 1.5 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.6 单位- 以国际单位制或英寸-磅单位表示的数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。 1.7 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 本标准中用于规定如何收集、记录和计算数据的方法被视为行业标准。此外，它们代表了通常应保留的有效数字。所使用的方法不考虑材料变化、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。 考虑分析中使用的有效数字超出了本标准的范围。 1.9 本标准提供了有组织的信息收集或一系列选项，并不推荐具体的行动方案。本文件不能取代教育或经验，应与专业判断一起使用。并非本标准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。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。 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、健康和环境实践，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 通常有必要确定支撑现有结构（如建筑物和桥梁）的深层基础构件的深度，对于这些结构，图纸和图纸均未给出- 已建立的记录可用。当必须增加基础荷载或打算在结构附近甚至下方开挖时，就会出现这种情况。当无法接近基础顶部时，如水下桥墩，可以使用平行地震法确定深基础的深度。该方法也适用于可以到达基础顶部，但基础元件无法通过低应变冲击完整性测试方法（ASTM）进行测试的情况 D5882 )由于基础类型（如隔板和割线桩墙、H型桩和板桩）或基础长细比过大。 5.2 符合实践标准的机构 D3740 通常认为能够进行合格和客观的测试和检查。 然而，本标准的用户应注意遵守惯例 D3740 由于正确进行和评估并行地震测试需要培训、专门知识和经验，因此其本身不能确保可靠的结果。合格的工程师应计划并监督现场数据的获取和测试结果的解释。

1.1 The test Methods described in this standard are used to measure the depth of vertical deep foundation elements including micropiles, driven piles (prefabricated or cast in-situ), bored piles, secant or tangent pile walls, caissons, barrettes, diaphragm walls and sheet pile walls. It is applicable where the top of the said foundation element (in the following also named “pile”) cannot be exposed for testing and other testing methods such as ASTM D5882 or D6760 cannot be used. 1.2 This standard provides minimum requirements for measuring the depth of deep foundations. Plans, specifications, and/or provisions may provide additional requirements and methods as needed to satisfy the objectives of a particular test program. 1.3 This standard provides the following test methods: 1.3.1 Method “A” using a vertical access tube adjacent to the deep foundation. 1.3.2 Method “B” using a seismic cone inserted into the ground adjacent to the deep foundation. 1.4 Apparati and Methods herein designated “optional” may produce different a different kind of test results or additional information and may be used only when approved by the engineer responsible for the test. 1.5 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.6 Units— The values stated in either SI units or inch-pound units 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. 1.7 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.8 The methods used to specify how data are collected, recorded and calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that should generally be retained. The methods used 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 standard to consider significant digits used in analysis. 1.9 This standard offers an organized collection of information or a series of options and does not recommend a specific course of action. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this standard may be applicable under 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 of this document only means that the document has been approved through the ASTM consensus process. 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, health, and environmental 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 It is often necessary to determine the depth of deep foundation elements supporting existing structures, such as buildings and bridges, for which neither drawings nor as-built records are available. Such situations occur when the foundation loads have to be increased or when it is intended to excavate near, or even under, the structure. When the top of the foundation is inaccessible, as is the case with underwater bridge piers, the Parallel Seismic method can be used to determine the deep foundations’ depth. The method is also applicable in cases where the foundation top can be reached, but the foundation element is not testable by the Low Strain Impact Integrity Testing Method (ASTM D5882 ) due to the foundation type (such as diaphragm and secant-pile walls, H-piles and sheet piles) or excessive foundation slenderness. 5.2 Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing and inspection. However, users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results since the proper conduct and evaluation of parallel seismic tests requires training, special knowledge and experience. A suitably qualified engineer shall plan and supervise the acquisition of field data and the interpretation of the test results.