現有剪應變速率對土壤動態特性之影響研究，在較大應變及高速剪動頻率下剪應變速率之影響相對欠缺，其主要原因為缺乏相關可進行大應變高速剪動設備，本研究目的為研發可進行兼具高速及大應變之K0壓密中空扭剪試驗儀，系統可施作頻率範圍為10-2~5Hz，克服現有單一剪動模式下可施作頻率範圍不足之限制。以此系統探討剪應變速率對乾淨砂及不同細粒料含量麥寮砂之土壤剪力模數與阻尼比影響。試驗結果顯示，乾淨砂及麥寮砂之土壤剪力模數隨剪動頻率呈一先升後降之趨勢，阻尼比則隨剪動頻率上升，有著先降後升之趨勢，此兩者趨勢相反，且皆以剪動頻率1Hz為此趨勢界線。並以剪力模數、阻尼比與剪動頻率關係之回歸趨勢線斜率探討不同土壤時，剪應變速率對剪力模數及阻尼比之影響程度。

The influence of the shear strain rate on the dynamic characteristics of the soil is relatively lacking in the shear strain rate under the large strain and high shearing frequency. The main reason is the lack of relevant large-strain high-speed shearing equipment. The purpose of this study is to develop the K0 compacted hollow cylinder torsional shear apparatus with high speed and large strain can be used. The system can be applied in the frequency range of 10-2~5Hz, which overcomes the limitation of the frequency range that can be applied in the existing single shear mode. This system was used to investigate the effect of shear strain rate on soil shear modulus and damping ratio of Ottawa sand and MLS with different fines content. The test results show that the soil shear modulus of Ottawa sand and MLS has a tendency to rise first and then decrease with the shearing frequency, and the damping ratio increases with the shearing frequency, which has a tendency to drop first and then rise. The shearing frequency of 1 Hz is used as the trend boundary. The slope of the regression curve of the relationship between dynamic characteristics and shearing frequency is used to investigate the effect of shear strain rate on dynamic characteristics.

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