Evaluation of Horizontal Stresses in Soil during Direct Simple Shear by High-Resolution Distributed Fiber Optic Sensing
This paper presents an approach for evaluating the horizontal stresses that develop in geotechnical Direct Simple Shear (DSS) tests through the use of high-resolution distributed fiber optic sensing. For this aim, fiber optics were embedded in 3D printed rings used for confining the soil in the test...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-08-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/19/17/3684 |
| _version_ | 1811303967936741376 |
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| author | Assaf Klar Michael Roed Irene Rocchi Ieva Paegle |
| author_facet | Assaf Klar Michael Roed Irene Rocchi Ieva Paegle |
| author_sort | Assaf Klar |
| collection | DOAJ |
| description | This paper presents an approach for evaluating the horizontal stresses that develop in geotechnical Direct Simple Shear (DSS) tests through the use of high-resolution distributed fiber optic sensing. For this aim, fiber optics were embedded in 3D printed rings used for confining the soil in the test procedure. An analytical approach linking the measured spatially-distributed strain profile and the internal soil-ring contact stresses is developed in the paper. The method is based on representation of the contact stresses by a Fourier series expansion, and determining the coefficients of the series by minimizing the difference between the measured strain and the analytical strain within the linear elastic ring. The minimization problem results in a linear set of equations that can easily be solved for a given measurement. The approach is demonstrated on a set of drained DSS tests on clean sand specimens. Stress paths using the evaluated horizontal stresses are plotted together with Mohr circles at failure. These illustrate how, in these specific tests, the horizontal stress increases and principal stress direction rotates, until failure occurs along horizontal planes. |
| first_indexed | 2024-04-13T07:57:33Z |
| format | Article |
| id | doaj.art-03697c1d99a64555805e953729f8f50e |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T07:57:33Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-03697c1d99a64555805e953729f8f50e2022-12-22T02:55:21ZengMDPI AGSensors1424-82202019-08-011917368410.3390/s19173684s19173684Evaluation of Horizontal Stresses in Soil during Direct Simple Shear by High-Resolution Distributed Fiber Optic SensingAssaf Klar0Michael Roed1Irene Rocchi2Ieva Paegle3Department of Civil Engineering, Technichal University of Denmark, 2800 Kgs. Lyngby, DenmarkDepartment of Civil Engineering, Technichal University of Denmark, 2800 Kgs. Lyngby, DenmarkDepartment of Civil Engineering, Technichal University of Denmark, 2800 Kgs. Lyngby, DenmarkDepartment of Civil Engineering, Technichal University of Denmark, 2800 Kgs. Lyngby, DenmarkThis paper presents an approach for evaluating the horizontal stresses that develop in geotechnical Direct Simple Shear (DSS) tests through the use of high-resolution distributed fiber optic sensing. For this aim, fiber optics were embedded in 3D printed rings used for confining the soil in the test procedure. An analytical approach linking the measured spatially-distributed strain profile and the internal soil-ring contact stresses is developed in the paper. The method is based on representation of the contact stresses by a Fourier series expansion, and determining the coefficients of the series by minimizing the difference between the measured strain and the analytical strain within the linear elastic ring. The minimization problem results in a linear set of equations that can easily be solved for a given measurement. The approach is demonstrated on a set of drained DSS tests on clean sand specimens. Stress paths using the evaluated horizontal stresses are plotted together with Mohr circles at failure. These illustrate how, in these specific tests, the horizontal stress increases and principal stress direction rotates, until failure occurs along horizontal planes.https://www.mdpi.com/1424-8220/19/17/3684distributed diber-optic sensingdirect simple sheargeotechnical engineeringcontact problemssoil properties |
| spellingShingle | Assaf Klar Michael Roed Irene Rocchi Ieva Paegle Evaluation of Horizontal Stresses in Soil during Direct Simple Shear by High-Resolution Distributed Fiber Optic Sensing Sensors distributed diber-optic sensing direct simple shear geotechnical engineering contact problems soil properties |
| title | Evaluation of Horizontal Stresses in Soil during Direct Simple Shear by High-Resolution Distributed Fiber Optic Sensing |
| title_full | Evaluation of Horizontal Stresses in Soil during Direct Simple Shear by High-Resolution Distributed Fiber Optic Sensing |
| title_fullStr | Evaluation of Horizontal Stresses in Soil during Direct Simple Shear by High-Resolution Distributed Fiber Optic Sensing |
| title_full_unstemmed | Evaluation of Horizontal Stresses in Soil during Direct Simple Shear by High-Resolution Distributed Fiber Optic Sensing |
| title_short | Evaluation of Horizontal Stresses in Soil during Direct Simple Shear by High-Resolution Distributed Fiber Optic Sensing |
| title_sort | evaluation of horizontal stresses in soil during direct simple shear by high resolution distributed fiber optic sensing |
| topic | distributed diber-optic sensing direct simple shear geotechnical engineering contact problems soil properties |
| url | https://www.mdpi.com/1424-8220/19/17/3684 |
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