1.1本指南涵盖了计算现场等效层弹性模量的概念，可用于路面评估、修复和加铺层设计。根据挠度数据计算得出的等效弹性模量取决于方法，并表示在特定试验载荷和频率、温度以及其他环境和现场特定条件下，特定无损挠度试验（NDT）设备下各层的刚度。本指南不包括设计负荷、参考温度和其他设计相关因素的调整。本指南的目的不是推荐一种特定方法，而是概述估算路面层原位弹性模量的一般方法。 1.2本指南适用于柔性路面和某些情况下的刚性路面（即内部板荷载），但仅限于使用分层弹性理论 作为分析方法。应注意的是，各种可用的分层弹性计算机建模技术使用不同的假设和算法，结果可能会有很大差异。可以使用其他分析程序，如有限元建模，但需要对程序进行修改。 注1-如果需要其他分析方法，脚注3中列出的报告可以提供一些指导。 1.3以英寸-磅为单位的数值应视为标准值。括号中给出的国际单位仅供参考。 1.4本标准无意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。

1.1 This guide covers the concepts for calculating the in situ equivalent layer elastic moduli can be used for pavement evaluation, rehabilitation and overlay design. The resulting equivalent elastic moduli calculated from the deflection data are method-dependent and represent the stiffnesses of the layers under a specific nondestructive deflection testing (NDT) device at that particular test load and frequency, temperature, and other environmental and site-specific conditions. Adjustments for design load, reference temperature, and other design-related factors are not covered in this guide. The intent of this guide is not to recommend one specific method, but to outline the general approach for estimating the in situ elastic moduli of pavement layers. 1.2 This guide is applicable to flexible pavements and in some cases, rigid pavements (that is, interior slab loading), but is restricted to the use of layered elastic theory as the analysis method. It should be noted that the various available layered elastic computer modeling techniques use different assumptions and algorithms and that results may vary significantly. Other analysis procedures, such as finite element modeling, may be used, but modifications to the procedure are required. Note 1-If other analysis methods are desired, the report listed in Footnote 3 can provide some guidance. 1.3 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information only. 1.4 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.