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d-EXTO User Manual
YieldPoint Inc.
January 2021
Copyright © 2021 by YieldPoint Inc. The Information contained herein is the exclusive property of YieldPoint Inc.,
except as otherwise indicated and shall not be reproduced, transmitted, transcribed, stored in a retrieval system, or
translated into any human or computer language, in any form or by any means, electronic, mechanical, magnetic, optical,
chemical, manual, or otherwise without expressed written authorization from the company. The distribution of this
material outside the company may occur only as authorized by the company in writing.
YieldPoint hardware and software products are not designed to be used in the diagnosis and treatment of humans.
TM
Windows
is a registered trademark of Microsoft Corporation.
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Summary of Contents for YieldPoint dEXTO
- Page 1 The distribution of this material outside the company may occur only as authorized by the company in writing. YieldPoint hardware and software products are not designed to be used in the diagnosis and treatment of humans. Windows...
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Page 2: Warranty And Service Policy
Units out of warranty returned for repair, test, and/or recalibration are handled on a time and material basis. If requested, or if costs exceed 50% of current list price, YieldPoint Inc., advises the customer prior to making the repairs. Such repairs are performed at the customer’s expense. Typical test, recalibration, and repairs are 25% of the instrument’s current list price. - Page 3 There is no need to wait to temperature equalization either. 3. Plug the dEXTO into the d-READER and take a reading with the instrument uncoiled and relaxed. The instrument will scroll through its anchors. Anchor 1 is closest to the head.
- Page 4 5. Grout tubes of appropriate lengths, and tape to tie to the extensometers, must be available. 6. All YieldPoint instruments to be installed must be available at the site at the proper level. Extensometers must be uncoiled and laid to rest and straighten.
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Page 5: Data Interpretation
2.25” (57mm) borehole Grout hose taped to extensometer 0.4 w:c ratio grout 0.35-0.38 w:c ratio grout Instrument Head Grout Hose To Pump Figure 1: Fully installed d-EXTO in uphole. DATA INTERPRETATION d-EXTO Installation Manual Jan 2021... - Page 6 Assume we have a 3 point extensometer with anchors at 10ft, 34ft and 45ft from the roof of the excavation. Some hypothetical readings are shown in the following table. Notice that the readings are larger for the more distant anchors even though we intuitively know these points have physically moved less (i.e.
- Page 7 Anchor T=7days T=14 days 3 (45ft) 0.00 4.30 8.30 2 (34ft) 0.00 3.52 7.04 1 (10ft) 0.00 0.31 0.79 Roof TIME REFERENCED EXTENSOMETER DATA Now we need to “invert” the time-referenced extensometer data based on the fact that Anchor 3 at 45ft has moved least. This results in: Anchor T=7days T=14 days...
- Page 8 Displacement vesus distance Displacement versus Distance Distance (ft) An Excel spreadsheet can be developed and spatial plots can be generated with each line representing a snapshot for a given date (7 and 14 days in this case). The slope of the 2 plots is the average strain between the anchor points. Notice this is greater between the 10ft and 34ft anchor than between 0 and 10ft.
- Page 9 Roof-> 10 10-> 34 34->45 Location (ft) 40.5 0 days 7 days 101.706 405.0575 284.3395 14 days 259.1864 788.6634 459.3176 Strain vesus distance Strain versus Distance Distance from Roof (ft) Notice that the strain values are plotted midway between the anchor points. Strain is often a good indicator of crack density and indicates whether the deformation is truly distributed or localized at specific structures.
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