1.1 这些试验方法包括通过使用共振柱装置进行扭转振动，测定完整和重组条件下实心圆柱形土壤试样的剪切模量和剪切阻尼，作为剪切应变幅度的函数。试样的振动可能叠加在试样中受控的静态应力状态上。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）。当振动的剪切应变幅值小于10时，这些模量和阻尼测定的试验方法被认为是无损的 –2 % (10 –4 在中/英寸），可以在同一个试样上，在不同的静应力状态下进行多次测量。 1.2 这些试验方法涵盖了两种装置配置:装置类型1，将已知扭矩施加到试样顶部，并在试样顶部测量产生的旋转运动，以及第2类装置，其中未校准扭矩施加在试样顶部，通过试样传递的扭矩由试样底部的扭矩传感器测量。对于这两种类型的装置，扭矩应用于试样的活动端（通常为顶部），旋转运动也在试样的活动端测量。 1.3 这些试验方法仅限于测定剪切模量和剪切阻尼、必要的振动以及与振动相关的试样制备程序等。 ，不包括轴向和横向静态法向应力的应用、测量或控制。后一种程序可能包含在试验方法中，但不限于此 D2850 , D4767 或 D7181 . 1.4 有效数字- 所有记录和计算值应符合实践中制定的有效数字和舍入指南 D6026 . 1.4.1 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。 1.4.2 比本标准规定的有效数字或灵敏度更高的测量值不应视为不符合本标准。 1.5 单位- 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。以国际单位制以外的单位报告试验结果不应视为不符合这些试验方法。 1.5.1 转换后的英寸-磅单位使用重力单位制。在这个系统中，磅（lbf）表示力（重量）的单位，而质量的单位是段塞。除非涉及动态（F=ma）计算，否则未给出转换后的段塞单元。 1.5.2 工程/建筑行业的常见做法是同时使用磅来表示质量单位（lbm）和力（lbf）。这隐含地结合了两个独立的单元系统；也就是说，绝对系统和引力系统。在一个标准中结合使用两套独立的英寸-磅单位在科学上是不可取的。如上所述，本标准包括英寸的重力系统- 磅单位，不使用/呈现质量的缓动单元。然而，使用天平或天平记录磅质量（lbm）或记录密度（lbm/ft） 3. 不应视为不符合本标准。 1.6 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。 1.7 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 通过本文所述的共振柱技术测量的给定土壤的等效弹性剪切模量和阻尼能力取决于振动的应变幅度、有效应力状态和土壤的孔隙比、温度、时间、，由于这些方法中未规定静态轴向应力和侧向应力以及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静态轴向应力和侧向应力以及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。 这些试验的结果对于涉及土壤-结构相互作用和土壤沉积物地震响应的计算非常有用。 注1: 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 These test methods cover the determination of shear modulus and shear damping as a function of shear strain amplitude for solid cylindrical specimens of soil in intact and reconstituted conditions by torsional vibration using resonant column devices. The vibration of the specimen may be superposed on a controlled static 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 shear strain amplitudes of vibration are less than 10 –2 % (10 –4 in./in.), and many measurements may be made on the same specimen and with various states of static stress. 1.2 Two device configurations are covered by these test methods: Device Type 1 where a known torque is applied to the top of the specimen and the resulting rotational motion is measured at the top of the specimen, and Device Type 2 where an uncalibrated torque is applied to the top of the specimen and the torque transmitted through the specimen is measured by a torque transducer at the base of the specimen. For both types of devices, the torque is applied to the active end (usually top) of the specimen and the rotational motion also is measured at the active end of the specimen. 1.3 These test methods are limited to the determination of the shear modulus and shear damping, the necessary vibration, and specimen preparation procedures related to the vibration, etc., and do not cover the application, measurement, or control of the axial and lateral static normal stresses. The latter procedures may be covered by, but are not limited to, Test Method D2850 , D4767 , or D7181 . 1.4 Significant Digits— All recorded and calculated values shall conform to the guide for significant digits and rounding established in Practice D6026 . 1.4.1 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 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 methods for engineering design. 1.4.2 Measurements made to more significant digits or better sensitivity than specified in this standard shall not be regarded a nonconformance with this standard. 1.5 Units— The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units, which are provided for information only and are not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with these test methods. 1.5.1 The converted inch-pound units use the gravitational system of units. In this system, the pound (lbf) represents a unit of force (weight), while the unit for mass is slugs. The converted slug unit is not given, unless dynamic (F = ma) calculations are involved. 1.5.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit for mass. However, the use of balances or scales recording pounds of mass (lbm) or recording density in lbm/ft 3 shall not be regarded as nonconformance with this standard. 1.6 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. 1.7 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 equivalent elastic shear modulus and damping capacity of a given soil, as measured by the resonant column technique herein described, depend upon the strain amplitude of vibration, the state of effective stress, and the void ratio of the soil, temperature, time, etc. Since the application and control of the static axial and lateral 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 static axial and lateral 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. The results of these tests are useful for calculations involving soil-structure interaction and seismic response of soil deposits. Note 1: The quality of the results produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities. 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.