Show simple item record

dc.contributor.authorForbes, Bradleyen
dc.date.accessioned2020-02-28T19:37:27Z
dc.date.available2020-02-28T19:37:27Z
dc.identifier.urihttp://hdl.handle.net/1974/27646
dc.description.abstractDistributed optical fiber strain sensing is investigated as a technology to enhance the assessment of tendon reinforcement elements that are commonly used in mines and tunnelling projects. Central to this research effort is the application of a particular high spatial resolution Rayleigh optical frequency domain reflectometer that is able to distinguish strain along a standard optical fiber at spatial increments as low as 0.65 millimeters. In applying this technology to reinforcement elements, the objective is to measure a nearly continuous strain distribution, such that complex and non-uniform in-situ reinforcement responses that are induced by ground deformations can be characterized and quantified. This has been approached from an intrinsic sensing perspective, whereby several instrumenting procedures have been developed to directly couple fiber optic strain sensors with various reinforcement elements. Notably, a delta-shaped sensor arrangement and accompanying analysis have been developed in order to calculate the coaxial strain scalar and bending moment vector mobilized along a reinforcement element. Significantly, this allows the maximum strain distribution along a reinforcement element to be measured without prior knowledge of the location(s) or orientation(s) of strain inducing features. Through a series of laboratory experiments and in-situ studies it was demonstrated that load experienced by a reinforcement element can be measured as a function of distance from the load inducing source. This critically improves common pull test assessment of reinforcement because bond stress and load development length can be quantified and related to bond strength models. Furthermore, several in-situ reinforcement mechanisms mobilized by excavation advancement were measured. These included stress redistributions facilitated by umbrella arch elements in the form of distributed bending moments as well as localized dowel reinforcement across shearing discontinuities. The latter was found to concentrate strain within several centimeters of an active discontinuity, necessitating the high spatial resolution measurements. In view of use of this technology by practitioners, it has been established that the sensor arrangement can be installed in conformance with standard reinforcement handling and mechanized installation procedures. The end benefit is the developed sensing technique can be used by ground control engineers to more confidently justify alterations and optimizations to support design.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.rightsAttribution 3.0 United Statesen
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/
dc.subjectTunnel Supporten
dc.subjectGround Supporten
dc.subjectOptical Fiber Strain Sensingen
dc.subjectDeep Miningen
dc.subjectExcavation Displacementsen
dc.subjectSupport Elementen
dc.subjectRock Bolten
dc.subjectCable Bolten
dc.subjectMonitoringen
dc.subjectUmbrella Archen
dc.subjectShearing Grounden
dc.titleHigh Spatial Resolution Measurement of Tendon Reinforcement in Underground Construction Worksen
dc.typethesisen
dc.description.degreePhDen
dc.contributor.supervisorVlachopoulos, Nicholasen
dc.contributor.supervisorDiederichs, Marken
dc.contributor.departmentGeological Sciences and Geological Engineeringen
dc.degree.grantorQueen's University at Kingstonen


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record

Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
Except where otherwise noted, this item's license is described as Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada