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ASTM D6820-2002(2007) 次表面探查用时间域电磁法的使用标准指南
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【英文标准名称】: Standard Guide for Use of the Time Domain Electromagnetic Method for Subsurface Investigation
【原文标准名称】: 次表面探查用时间域电磁法的使用标准指南
【标准号】: ASTM D6820-2002(2007)
【标准状态】: 现行
【国别】:
【发布日期】: 2002
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: D18.01
【标准类型】: (Guide)
【标准水平】: ()
【中文主题词】:
【英文主题词】: conductivity; electrical method; geophysics; resistivity; subsurface investigation; surface geophysics; time domain electromagnetic method; transient electromagnetic method
【摘要】: 1.1 Purpose and ApplicationThis guide summarizes the equipment, field procedures, and interpretation methods for the assessment of subsurface materials and their pore fluids using the Time Domain Electromagnetic (TDEM) method. This method is also known as the Transient Electromagnetic Method (TEM), and in this guide is referred to as the TDEM/TEM method. Time Domain and Transient refer to the measurement of a time-varying induced electromagnetic field.1.1.1 The TDEM/TEM method is applicable to investigation of a wide range of subsurface conditions. TDEM/TEM methods measure variations in the electrical resistivity (or the reciprocal, the electrical conductivity) of the subsurface soil or rock caused by both lateral and vertical variations in various physical properties of the soil or rock. By measuring both lateral and vertical changes in resistivity, variations in subsurface conditions can be determined.1.1.2 Electromagnetic measurements of resistivity as described in this guide are applied in geologic studies, geotechnical studies, hydrologic investigations, and for mapping subsurface conditions at waste disposal sites (). Resistivity measurements can be used to map geologic changes such as lithology, geological structure, fractures, stratigraphy, and depth to bedrock. In addition, measurement of resistivity can be applied to hydrologic investigations such as the depth to water table, depth to aquitard, presence of coastal or inland ground water salinity, and for the direct exploration for ground water.1.1.3 General references for the use of the method are McNeill (), Kearey and Brooks (), and Telford et al ().1.2 Limitations1.2.1 This guide provides an overview of the TDEM/TEM method. It does not provide or address the details of the theory, field procedures, or interpretation of the data. Numerous references are included for that purpose and are considered an essential part of this guide. It is recommended that the user of the TDEM/TEM method be familiar with the references cited and with the ASTM standards D 420, D 653, D 5088, D 5608, D 5730, D 5753, D 6235, D 6429 and D 6431.1.2.2 This guide is limited to TDEM/TEM measurements made on land. The TDEM/TEM method can be adapted for a number of special uses on land, water, ice, within a borehole, and airborne. Special TDEM/TEM configurations are used for metal and unexploded ordnance detection. These TDEM/TEM methods are not discussed in this guide.1.2.3 The approaches suggested in this guide for the TDEM/TEM method are commonly used, widely accepted, and proven. However, other approaches or modifications to the TDEM/TEM method that are technically sound may be substituted.1.2.4 This guide 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, experience, and should be used in conjunction with professional judgment. Not all aspects of this guide may be applicable in 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 means only that the document has been approved through the ASTM consensus process.1.3 Precautions1.3.1 It is the responsibility of the user of this guide to follow any precautions in the equipment manufacturer''s recommendations and to establish appropriate health and safety practices.1.3.2 If the method is used at sites with hazardous materials, operations, or equipment, it is the responsibility of the user of this guide to establish appropriate safety and health practices and to determine the applicability of any regulations prior to use.1.3.3......
【中国标准分类号】: A42
【国际标准分类号】: 33_100_01
【页数】: 15P.;A4
【正文语种】:

关键字: ASTM D682

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