Evaluation of Reliability of Strain Gauge Measurements for Geosynthetics

토목섬유 보강재에 적용한 스트레인게이지 실측값의 신뢰성 평가

Cho, Sam-Deok;Lee, Kwang-Wu;Li, Zhuang;Kim, Uk-Gie

  • Received : 2015.10.09
  • Accepted : 2015.11.20
  • Published : 2015.12.30


Geosynthetics are widely used in different ways such as reinforcement of structures in road, railway, harbor and dam engineering, drainage, separation and erosion prevention. They are especially applied to reinforced retaining wall and slope or ground reinforcement. Recently, geosynthetics reinforced pile supported (GRPS) embankment was developed to improve stability and construability of embankments in railway engineering. Extension strains are usually measured by strain gauges adhered to geosynthetics to evaluate the stability of geosynthetics. However, the measurements are influenced by manufacturing method and stiffness of geosynthetics and also adherence of strain gauge. In this study, wide-width tensile strength tests were performed on three types of geosynthetics including geogrid, woven geotextile and non-woven geotextile. During the test, strains of geosynthetics were measured by both video extensometer and strain gauges adhered to the geosynthetics and the measured results were compared. Results show that the measured results by strain gauges have high reliability in case of large stiffness geosythetics like geogrid and woven geotextile, whereas they have very low reliability for small stiffness geosythetics like non-woven geotextile.


Geosynthetics;Wide-width tensile test;Tensile strain;Strain gauge;Reliability


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