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采用云林离岛工业区外海料源区土壤为试验用砂,考虑现有回填地之土壤条件,采用湿捣法制试样,探讨不同相对密度、有效围压应力及固结应力比等因素,进行一系列共振柱试验,以评估回填土於初始剪应力作用下之土动态特性。由试验结果分析得知,回填土壤之剪切模量有随固结应力比与有效围压应力之增加而增加之趋势,而最大剪切模量( Gmax) 亦随固结应力比与有效围压应力之增加而增加,同时不受初始相对密度不同之影响。另回填土壤因固结应力比所引致之最大剪切模量增量远大于孔隙变化所引致之增量。但固结应力比与有效围压应力对阻尼比之影响则较不明显。同时本研究在Hardin 与Richart(1963) 所建议之评估方式基础上进行修正,对云林外海土壤建立非等向压密条件下,最大剪切模量与不同剪应变所对应之剪切模式经验公式,可提供回填造地设计、施工及抗震分析之参考
Taking the soil from the source material area of offshore industrial zone in Yunlin as test sand, taking into account the soil conditions of the existing backfill, wet pounding method was used to test the factors such as relative density, effective confining pressure and consolidation stress ratio A series of resonant column tests were conducted to evaluate the dynamic behavior of backfill soil under initial shear stress. According to the analysis of the test results, the shear modulus of the backfilled soil tends to increase with the consolidation stress ratio and the effective confining pressure stress, and the maximum shear modulus (Gmax) also increases with the consolidation stress ratio and the effective radius The increase in compressive stress increases without being affected by the difference in initial relative density. In addition, the maximum increment of shear modulus due to the consolidation stress ratio of the backfill soil is much larger than the increment caused by the change of the pore volume. However, the effect of consolidation stress ratio and effective confining stress on damping ratio is less obvious. In the meantime, based on the assessment method proposed by Hardin and Richart (1963), this study amended the shear model corresponding to the maximum shear modulus and the different shear strain under the condition of non-isotropic compaction on the open ocean of Yunlin. Formula, can provide landfill design, construction and seismic analysis of the reference