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以上海天然沉积黏性土(2)~(6)层土为研究对象,利用共振柱仪器实现了各土层在不同固结压力下的弯曲元和共振柱试验,得到了各层土体小应变水平下的初始剪切模量。试验结果表明,利用弯曲元试验时域初达波法和时域峰值法能得到与现场单孔波速原位测试结果相一致的剪切波速;共振柱试验得到的土体小应变初始剪切模量与弯曲元试验结果基本一致。分析表明,在所试验的各层土中,第(3)层淤泥质粉质黏土和第(4)层淤泥质黏土的剪切模量相对较小,第(6)层土的剪切模量最大;第(2)、(5)层土的剪切模量接近,且大于(3)、(4)层,小于第(6)层土,这与土样的实际天然状态是相吻合的。利用Rampello公式可较好地拟合上海黏性土的初始剪切模量,所得的拟合曲线可用来确定各土层在不同深度处的初始剪切模量。
Taking the natural sedimentary clay (2) ~ (6) soil in Shanghai as the research object, the bending element and the resonance column test of each soil under different consolidation pressures were carried out by using the resonance column instrument. Initial shear modulus at strain level. The experimental results show that the shear wave velocity can be obtained by using the initial wave method and the time-domain peak method in the time domain of the flexural element test. The initial shear modulus of the soil in the resonance column experiment The results are basically consistent with the results of bending element test. The analysis shows that the shear modulus of the silt clay in the layer (3) and the silt clay in the layer (4) is relatively small among the tested soil layers. The shear modulus of the soil in the layer (6) (2) and (5) are close to and greater than (3), (4), and less than (6), which is consistent with the actual natural state of soil samples of. The Rampello formula can be used to fit the initial shear modulus of clay in Shanghai. The obtained fitting curve can be used to determine the initial shear modulus of each layer at different depths.