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지오그리드의 크리프 거동 평가 및 크리프 감소계수 산정
차동환(Dong-Hwan Cha),윤광중(Kwang-Jung Yoon),구현진(Hyun-Jin Koo),전한용(Han-Yong Jeon) 한국토목섬유학회 2008 한국토목섬유학회 학술발표회 Vol.2008 No.4
There are some methods such as conventional creep test, TTS(Time-Temperature superposition), and SIM(Stepped Isothermal Method) for creep behavior evaluation of geogrid. The estimation of reduction factor from the creep behavior is based on creep rupture or limit creep strain. In this study, using conventional creep test and SIM we evaluated the creep behavior of the geogrid which was composed of high tenacity PET fibers and polyolefin polymer for low creep deformation and excellent resistance to installation damage. And then the creep reduction factor was estimated. The creep reduction factors on criteria evaluated from the results of the creep test methods and their combination are in the range of 1.571 ~ 1.615, which have no significant difference. Therefore it was concluded that all of creep test methods and the criteria for creep reduction factor used in this study are useful, and for creep reduction factor it is possible to use the criterion of creep rupture combination from conventional method and SIM method but not that of limit creep strain combination from them because their strain values with methods are different each other.