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在收集泥炭土动力测试数据及开展泥炭土动三轴试验基础上,统计分析了泥炭土的剪切波速与土层深度及物理指标的关系、泥炭土的动剪切模量比和阻尼比随剪应变的变化规律,并与黏性土进行了对比分析。结果表明:泥炭土是一种软弱高压缩性土,其动力特性受多种因素影响,表现为动强度低,动力特性复杂。昆明地区泥炭土的剪切波速与土层深度有较好的相关性,与单个物理指标之间没有明显相关性。建立的美国加州和我国昆明两个地区泥炭土剪切模量比和阻尼比计算模型能较好地描述其随剪应变的变化规律。与加州泥炭土相比,我国昆明地区泥炭土的模量比在低剪应变下相对偏大,而在高剪应变下相对偏小,阻尼比也表现出类似的变化特征。与黏土相比,泥炭土的模量比明显偏大,而阻尼比明显偏小。目前国内对泥炭土动力特性的研究还不多,需要积累更多的测试数据,以便得到更合理的泥炭土动力学参数及模型。
On the basis of collecting the dynamic test data of peat soil and carrying out the triaxial test of peat soil, the relationship between shear wave velocity of peat soil and soil depth and physical indexes was statistically analyzed. The dynamic shear modulus ratio and damping ratio of peat soil Shear strain changes, and compared with the cohesive soil. The results show that peat soil is a kind of weak and highly compressible soil. Its dynamic characteristics are affected by many factors, which are characterized by low dynamic strength and complex dynamic characteristics. Kunming area peat soil shear wave velocity and depth of soil has a good correlation, and there is no significant correlation with the single physical indicators. The calculation model of shear modulus ratio and damping ratio of peat soil in the United States California and Kunming in China can well describe the variation law with shear strain. Compared with the peat soil in California, the modulus of peat soil in Kunming area is relatively larger than that under low shear strain, but relatively small under high shear strain, and the damping ratio also shows similar variation characteristics. Compared with clay, peat soil modulus ratio was significantly larger, while the damping ratio was significantly smaller. At present, there are not many studies on the dynamic characteristics of peat soils in China, and more test data needs to be accumulated in order to obtain more reasonable peat soil dynamic parameters and models.