1.1这些试验方法包括通过使用共振柱进行振动，在未扰动和重塑条件下测定土壤实心圆柱试样的剪切模量、剪切阻尼、杆模量（通常称为杨氏模量）和杆阻尼。试样的振动可能叠加在试样中受控的环境应力状态上。振动装置和试样可封闭在三轴室内，并承受全方位压力和轴向载荷。此外，试样可能会受到其他受控条件的影响（例如，孔隙水压力、饱和度、温度）。当振动的应变幅值小于10时，这些模量和阻尼测定的测试方法被认为是无损的 4. 拉德（10 4. 在中/英寸），可以在同一个试样上，在不同的环境应力状态下进行多次测量。 1.2这些试验方法仅涵盖模量和阻尼的测定、必要的振动以及与振动有关的试样制备程序等，不包括环境应力的应用、测量或控制。试验方法D 2166或D 2850可能涵盖但不限于后一种程序。 1.3所有记录和计算值应符合实施规程D 6026中制定的有效数字和舍入指南。 1.3.1本标准中用于规定如何收集/记录和计算数据的程序被视为行业标准。 此外，它们代表了通常应保留的有效数字。使用的程序不考虑材料变化、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标准的范围。 1.3.2比本标准规定的有效数字或灵敏度更高的测量不应视为不符合本标准。 1.4以国际单位制表示的数值应视为标准。以国际单位制以外的单位报告试验结果应视为符合这些试验方法。 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。 ====意义和用途====== 通过本文所述的共振柱技术测量的给定土壤的模量和阻尼取决于振动的应变幅度、有效应力的环境状态以及土壤的孔隙比、温度、时间等。 由于这些方法中未规定环境应力和孔隙比的应用和控制，因此结果对现场条件的适用性将取决于环境应力和孔隙比的应用和控制程度，以及其他参数，如土壤结构、重复现场条件。用于模拟现场条件的技术取决于许多因素，由工程师决定哪些技术适用于给定的情况和土壤类型。

1.1 These test methods cover the determination of shear modulus, shear damping, rod modulus (commonly referred to as Young's modulus), and rod damping for solid cylindrical specimens of soil in the undisturbed and remolded conditions by vibration using the resonant column. The vibration of the specimen may be superposed on a controlled ambient state of stress in the specimen. The vibration apparatus and specimen may be enclosed in a triaxial chamber and subjected to an all-around pressure and axial load. In addition, the specimen may be subjected to other controlled conditions (for example, pore-water pressure, degree of saturation, temperature). These test methods of modulus and damping determination are considered nondestructive when the strain amplitudes of vibration are less than 10 4 rad (10 4 in./in.), and many measurements may be made on the same specimen and with various states of ambient stress. 1.2 These test methods cover only the determination of the modulus and damping, the necessary vibration, and specimen preparation procedures related to the vibration, etc., and do not cover the application, measurement, or control of the ambient stress. The latter procedures may be covered by, but are not limited to, Test Methods D 2166 or D 2850. 1.3 All recorded and calculated values shall conform to the guide for significant digits and rounding established in Practice D 6026. 1.3.1 The procedures 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 procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the users 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 methods for engineering design. 1.3.2 Measurements made to more significant digits or better sensitivity than specified in this standard shall not be regarded a nonconformance with this standard. 1.4 The values stated in SI units are to be regarded as the standard. Reporting test results in units other than SI shall be regarded as conformance with these test methods. 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. ====== Significance And Use ====== The modulus and damping of a given soil, as measured by the resonant-column technique herein described, depend upon the strain amplitude of vibration, the ambient state of effective stress, and the void ratio of the soil, temperature, time, etc. Since the application and control of the ambient stresses and the void ratio are not prescribed in these methods, the applicability of the results to field conditions will depend on the degree to which the application and control of the ambient stresses and the void ratio, as well as other parameters such as soil structure, duplicate field conditions. The techniques used to simulate field conditions depend on many factors and it is up to the engineer to decide on which techniques apply to a given situation and soil type.