Standard Practices for Monitoring Earth or Structural Movement Using Inclinometers

SIGNIFICANCE AND USE
4.1 An inclinometer is a deformation monitoring system, which uses a grooved pipe or casing with internal longitudinal grooves aligned with the anticipated direction of movement, installed in either a soil/rock mass or a geotechnical structural element. The inclinometer casing can be surveyed with a single traversing probe or with an array of in-place inclinometer (IPI) gauges connected to a data logger. The measurement and calculation of deformation normal to the axis of the inclinometer casing is done by passing a probe along the length of this pipe or placement of a sensor array, guided by the internal grooves. The probe or sensor array measures the inclination of the pipe, usually in two orthogonal directions 90° apart (X- and Y-direction) with respect to the axis of the casing (Z-direction, usually the line of gravity). Measurements are converted to distances using trigonometric functions. Successive surveys compared with an initial survey give differences in position and indicate deformation normal to the axis of the inclinometer casing. In most cases the inclinometer casing is installed in a near-vertical hole, and the measurements indicate subsurface horizontal deformation. In some cases, the inclinometer casing is installed horizontally, and the measurements indicate vertical deformation.  
4.2 Inclinometers are also called slope inclinometers or slope indicators. Typical applications include measuring the rate and direction of landslide movement and locating the zone of shearing, monitoring the magnitude and rate of horizontal movements for embankments and excavations, monitoring the settlement and lateral spread beneath tanks and embankments, and monitoring the deflection of bulkheads, piles or structural walls.
Note 1: The precision of this standard is dependent on the competence of the personnel performing it and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of...
SCOPE
1.1 This standard covers the use of inclinometers to monitor the internal movement of ground, or lateral movement of subsurface structures. The standard covers types of instruments, installation procedures, operating procedures, and maintenance requirements. The standard also provides formulae for data reduction.  
1.2 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 unless superseded by this standard.  
1.2.1 The procedures used to specify how data are collected, recorded or calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should 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; 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 analytical methods for engineering design.  
1.3 Units—The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard.  
1.4 This standard 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 or experience and should be used in conjunction with professional judgment. Not all aspects of this standard 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 man...

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Publication Date
31-May-2021
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ASTM D6230-21e1 - Standard Practices for Monitoring Earth or Structural Movement Using Inclinometers
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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.
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Designation: D6230 − 21
Standard Practices for
Monitoring Earth or Structural Movement Using
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Inclinometers
This standard is issued under the fixed designation D6230; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—Minor corrections were editorially made throughout in July 2021.
1. Scope* of a given professional service must be judged, nor should this
document be applied without consideration of a project’s many
1.1 This standard covers the use of inclinometers to monitor
unique aspects. The word “Standard” in the title of this
the internal movement of ground, or lateral movement of
document means only that the document has been approved
subsurface structures. The standard covers types of
through the ASTM consensus process.
instruments, installation procedures, operating procedures, and
1.5 This standard does not purport to address all of the
maintenance requirements. The standard also provides formu-
safety concerns, if any, associated with its use. It is the
lae for data reduction.
responsibility of the user of this standard to establish appro-
1.2 All observed and calculated values shall conform to the
priate safety, health, and environmental practices and deter-
guidelines for significant digits and rounding established in
mine the applicability of regulatory limitations prior to use.
Practice D6026 unless superseded by this standard.
1.6 This international standard was developed in accor-
1.2.1 Theproceduresusedtospecifyhowdataarecollected,
dance with internationally recognized principles on standard-
recorded or calculated in this standard are regarded as the
ization established in the Decision on Principles for the
industry standard. In addition, they are representative of the
Development of International Standards, Guides and Recom-
significant digits that generally should be retained. The proce-
mendations issued by the World Trade Organization Technical
dures used do not consider material variation, purpose for
Barriers to Trade (TBT) Committee.
obtaining the data, special purpose studies, or any consider-
ations for the user’s objectives; it is common practice to
2. Referenced Documents
increase or reduce significant digits of reported data to be
2
2.1 ASTM Standards:
commensuratewiththeseconsiderations.Itisbeyondthescope
D653 Terminology Relating to Soil, Rock, and Contained
of this standard to consider significant digits used in analytical
Fluids
methods for engineering design.
D3740 Practice for Minimum Requirements for Agencies
1.3 Units—The values stated in SI units are to be regarded
Engaged in Testing and/or Inspection of Soil and Rock as
as the standard. The inch-pound units given in parentheses are
Used in Engineering Design and Construction
for information only. Reporting of test results in units other
D3966/D3966M Test Methods for Deep Foundations Under
than SI shall not be regarded as nonconformance with this
Lateral Load
standard.
D6026 Practice for Using Significant Digits and Data Re-
cords in Geotechnical Data
1.4 This standard offers an organized collection of informa-
D7299 Practice for Verifying Performance of a Vertical
tion or a series of options and does not recommend a specific
Inclinometer Probe
course of action. This document cannot replace education or
experienceandshouldbeusedinconjunctionwithprofessional
3. Terminology
judgment. Not all aspects of this standard may be applicable in
3.1 For definitions of common technical terms used in this
all circumstances. This ASTM standard is not intended to
representorreplacethestandardofcarebywhichtheadequacy standard, refer to Terminology D653.
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This practice is under the jurisdiction of ASTM Committee D18 on Soil and
Rock and is the direct responsibility of Subcommittee D18.23 on Field Instrumen-
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tation. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved June 1, 2021. Published June 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1998. Last previous edition approved in 2013 as D6230 – 13. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D6230-21E01. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6230
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