1.1这些试验方法仅限于测定水平移动压缩( P )和剪切( S )试验现场的地震波主要由土壤材料（与岩石相反）组成。包括用于关键项目的首选测试方法，其中必须获得最高质量的数据。还包括一种可选方法，用于不需要高精度测量的项目。 1.2将讨论数据的各种应用，并讨论可接受的解释程序和设备，如震源、接收器和记录系统。 其他项目包括钻孔间距、钻孔、套管、灌浆、偏差测量和实际测试。数据简化和解释仅限于识别各种地震波类型、视速度与真实速度的关系、示例计算、有效钻孔间距、使用斯奈尔折射定律、假设和计算机程序。 1.3需要注意的是，可以使用多个可接受的设备来产生高质量的P波或S波，或两者兼有。 此外，还可以使用几种类型的商用接收器和记录系统来进行可接受的井间测量。因此，这些测试方法主要涉及实际测试程序、数据解释和设备规范，以产生统一的测试结果。 1.4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。 1.4.1用于规定如何在这些试验方法中收集/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这些测试方法的范围。 1.4.2比这些试验方法中规定的更有效数字或更高灵敏度的测量不应视为不符合本标准。 1.5这些测试方法使用国际单位制编写。为方便起见，提供了英寸-磅单位。以英寸-磅单位表示的数值可能不是精确的等价物；因此，它们应独立于SI系统使用。结合两个系统的值可能会导致与这些测试方法不一致。 1.5.1处理英寸磅单位时，使用英寸磅单位的重力系统。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，否则未给出合理化的段塞单元。 1.5.2工程/建筑专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位制； 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，这些测试方法包括英寸-磅单位的重力系统，不使用或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。 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====== 地震跨孔法为设计师提供了与所讨论材料的地震波速相关的信息 (1). 2. 该数据可作为静态/动态分析的输入，作为计算剪切模量、杨氏模量和泊松比的手段，或仅用于确定钻孔之间可能存在的异常。 试验方法固有的基本假设如下: 5.2.1假设水平分层。 5.2.2斯奈尔折射定律适用。如果不应用斯奈尔折射定律，获得的速度将不可靠。

1.1 These test methods are limited to the determination of horizontally traveling compression ( P ) and shear ( S ) seismic waves at test sites consisting primarily of soil materials (as opposed to rock). A preferred test method intended for use on critical projects where the highest quality data must be obtained is included. Also included is an optional method intended for use on projects which do not require measurements of a high degree of precision. 1.2 Various applications of the data will be addressed and acceptable interpretation procedures and equipment, such as seismic sources, receivers, and recording systems will be discussed. Other items addressed include borehole spacing, drilling, casing, grouting, deviation surveys, and actual test conduct. Data reduction and interpretation is limited to the identification of various seismic wave types, apparent velocity relation to true velocity, example computations, effective borehole spacing, use of Snell's law of refraction, assumptions, and computer programs. 1.3 It is important to note that more than one acceptable device can be used to generate a high-quality P wave or S wave, or both. Further, several types of commercially available receivers and recording systems can also be used to conduct an acceptable crosshole survey. Consequently, these test methods primarily concern the actual test procedure, data interpretation, and specifications for equipment which will yield uniform test results. 1.4 All recorded and calculated values shall conform to the guide for significant digits and rounding established in Practice D 6026. 1.4.1 The procedures used to specify how data are collected/recorded and calculated in these test methods 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 these test methods 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 these test methods shall not be regarded a nonconformance with this standard. 1.5 These test methods are written using SI units. Inch-pound units are provided for convenience. The values stated in inch pound units may not be exact equivalents; therefore, they shall be used independently of the SI system. Combining values from the two systems may result in nonconformance with these test methods. 1.5.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In this system, the pound (lbf) represents a unit of force (weight), while the unit for mass is slugs. The rationalized 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, these test methods include the gravitational system of inch-pound units and do not use or 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. 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 seismic crosshole method provides a designer with information pertinent to the seismic wave velocities of the materials in question (1). 2 This data may be used as input into static/dynamic analyses, as a means for computing shear modulus, Young’modulus, and Poisson’ratio, or simply for the determination of anomalies that might exist between boreholes. Fundamental assumptions inherent in the test methods are as follows: 5.2.1 Horizontal layering is assumed. 5.2.2 Snell’laws of refraction will apply. If Snell’laws of refraction are not applied, velocities obtained will be unreliable.