Several contributions to soil compactibility induced by cyclic loading test |
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Authors: | Masayuki Koike Toru Kaji Prathuang Usaborisut Tomohiro Takigawa Akira Yoda Shozo Takahashi |
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Institution: | a Institute of Agricultural and Forest Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japanb Daikin Industries, Ltd., Kanaoka, Sakai, Osaka 591-8022, Japanc Faculty of Engineering, Kasetsart University, Kamphaengsaen Campus, Nakhon Pathom 73140, Thailandd R&;D Division, TCM Corporation, Ryugasaki, Ibaraki 301-8501, Japan |
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Abstract: | To investigate the soil compactibility during the cyclic loading, three different kinds of paddy field soils were prepared so as to clarify interrelationships among stress amplitude ratio, bulk density, soil water content and pore water pressure. The presetting values of specimen include the soil water content(percent dry basis) and bulk density of 25% d.b. and 1.1 Mg/m3 respectively. The relation between the number of cyclic loading and axial strain exhibited an asymptotically increasing trend, converging toward a specific value for each experimental condition. Possible effect caused by elastic–plastic characteristics could be recognized, when axial strain for 0.5 Hz excitation becomes greater than the one of 1.0 Hz under same stress amplitude ratio. When the stress amplitude ratio took 0.1, the absolute value of axial strain of 0.5 Hz was greater than the one of 1.0 Hz, whereas its decreasing trend was recognized in the sequence of silt, clay and silty sand. The qualitative relations between pore water pressure and number of cyclic loading were also examined to scrutinize the effect of effective water pressure to the soil compactibility. |
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Keywords: | Soil Soil compactibility Soil compaction Cyclic loading test Triaxial test Paddy field soil |
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