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동결 온도와 재하속도에 따른 동결토의 일축강도 특성에 관한 실험적 연구
최헌우(Heon-Woo Choi),서영교(Young-Kyo Seo),안승만(Sung-Man An),조현주(Hyun-Ju Cho) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
The mechanical properties governing the behavior of frozen soil structure have been interested design factors for some field applications. In this research, a series of laboratory tests were performed to investigate the compression strength properties of mixed soil(standard sand and kaolinite) in three different temperature such to the 5, 10 and 15 degrees below zero environment. The effects of strain rate(1.11*10-4 to 2.22*10-2) on the compressive properties of artificial soil have been determined experimentally using uniaxial compression test. Data included on the initial tangent modulus, compressive strength and failure strain.
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동결 온도와 재하속도에 따른 동결토의 일축압축 및 쪼갬인장 강도특성
서영교(Young-Kyo Seo),최헌우(Heon-Woo Choi) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.6
Recently the world has been suffering from difficulties related to the demand and supply of energy due to the democratic movements sweeping across the Middle East. Consequently, many have turned their attention to never-developed extreme regions such as the polar lands or deeps sea, which contain many underground resources. This research investigated the strength and initial elastic modulus values of eternally frozen ground through a uniaxial compression test and indirect tensile test using frozen artificial soil specimens. To ensure accurate test results, a sandy mud mixture of standard Jumunjin sand and kaolinite (20% in weight) was used for the specimens in these laboratory tests. Specimen were prepared by varying the water content ration (7%, 15%, and 20%). Then, the variation in the strength value, depending on the water content, was observed. This research also established three kinds of environments under freezing temperatures of -5℃, -10℃,and -15℃. Then, the variation in the strength value was observed, depending on the freezing environment. In addition, the tests divided the loading rate into 6 phases and observed the variation in the stress-strain ratio, depending on the loading rate. The test data showed that a lower freezing temperature resulted in a larger strength value. An increase in the ice content in the specimen with the increase in the water content ration influenced the strength value of the specimen. A faster load rate had a greater influence on the uniaxial compression and indirect tensile strengths of a frozen specimen and produced a different strength engineering property through the initial tangential modulus of elasticity. Finally, the long-term strength under a constant water content ration and freezing temperature was checked by producing stress-strain ratio curves depending on the loading rate.
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