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Title:

In-place Microelectromechanical System Inclinometer Strings: Evaluation of an Evolving Technology
Cover of In-place Microelectromechanical System Inclinometer Strings: Evaluation of an Evolving Technology

Accession Number:

01122374

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Continuous monitoring of subsurface ground movements is accomplished with in-place instruments utilizing automated data acquisition methods. These typically include TDR (Time Domain Reflectometry) or assemblies of several servo-accelerometer-based, electrolytic level transducer-based, or MEMS (Micro-Electro-Mechanical Systems) -accelerometer-based inclinometer probes that are usually aligned within grooved inclinometer casing. In-place inclinometers can determine the magnitude and direction of ground deformation, whereas TDR is primarily used to identify depths of active shearing only. Because the number of sensors in an in-place inclinometer chain may be somewhat limited due to cost or technological constraints, installation of in-place inclinometers on landslides has typically been preceded by the use of TDR or traversing probe inclinometers to target zones of interest. The New York State Department of Transportation (NYSDOT) is participating in prototype installations to evaluate long MEMS-inclinometer strings that do not utilize grooved casing or guide wheels. The new, guideless device and installation method is being used to achieve detailed deformation profiling (at 1-ft (0.3m) increments) to detect multiple zones of ground deformation. This approach can survive very large ground deformations and continue to collect measurements, and is able to be retrieved from severely distorted casing and redeployed. There are however, significant trade-offs and drawbacks associated with this guideless approach, notably concerning questionable backfill support and misalignment of sensors. This paper describes the prototype applications and issues that NYSDOT has experienced on two projects and makes suggestions for future improvements.

Monograph Accession #:

01120148

Report/Paper Numbers:

09-2118

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Barendse, Matthew Brian
Machan, George

Pagination:

12p

Publication Date:

2009

Conference:

Transportation Research Board 88th Annual Meeting

Location: Washington DC, United States
Date: 2009-1-11 to 2009-1-15
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures; Photos; References (8)

Geographic Terms:

New York (State)

Subject Areas:

Geotechnology; Highways; I42: Soil Mechanics

Source Data:

Transportation Research Board Annual Meeting 2009 Paper #09-2118

Files:

PRP, TRIS, TRB

Created Date:

Jan 30 2009 6:27PM