Development and Applications of a Triaxial Testing Device for Unsaturated Soils Using Fiber Optic Sensors
碩士 === 國立交通大學 === 土木工程系所 === 97 === The response of soil sepcimen in a triaxial cell is typically monitored using electronic sensors. For triaxial tests on unsaturated soil specimens, a long period is generally required to allow matrix suction within the specimen to reach a stable value. The eletr...
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| Format: | Others |
| Language: | zh-TW |
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2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/92101988933299537901 |
| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 97 === The response of soil sepcimen in a triaxial cell is typically monitored using electronic sensors. For triaxial tests on unsaturated soil specimens, a long period is generally required to allow matrix suction within the specimen to reach a stable value. The eletronic sensors are subject to electro-megnatic interference (EMI) and prone to zero shift and short circuit when exposed in water for a prolonged period. The objective of this research is to develop and verify the feasibility for a trixial testing device to be intrumented cimpletely using Optic Fiber Bragg Grating (FBG) sensors. The FBG instrument includes a load cell, gauge and differential pressure transducers and a linear displacement sensor. This set up takes advantage on the distributive, high sensitivity/stability and immune to EMI and short circuit characteristics of the FBG sensors. The thesis introduces the basic principles of FBG sensors and their calibrations. Procedures of using this sensors in a series of unsaturated soil tests and their results are described. The feasibility and accuracy of the FBG sensors are evaluated.
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