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本文对上海浅层士作了单剪流变试验,用试验所得的应力-应变-时间关系,测定了土的剪切流变参数、粘滞系数、长期强度等流变特性.试验表明,在一定密度-含水量状态和当剪应力小于某个屈服值时,可以利用叠加原理得到受剪历时相同的剪应力-剪应变关系曲线,两者的线性关系是正确的.同样,土的长期流动剪切速率-剪应力之间也成线性关系,从而由曲线中的线性段可求得土的剪切模量 G 和粘滞系数η.当剪应力超过某一屈服值后,曲线就成为非线性了,此屈服值可视为土的长期强度.在流变试验中这些参数均为时间的函数.
In this paper, a single shear rheological test was performed on Shanghai shallows. The rheological parameters such as shear rheological parameters, viscous coefficients, and long-term strength were measured using the stress-strain-time relationship obtained from the test. For a certain density-water content state and when the shear stress is less than a certain yield value, the shear stress-shear strain curve with the same shear duration can be obtained using the superposition principle. The linear relationship between the two is correct. Similarly, the long-term flow of soil The shear rate-shear stress also has a linear relationship, so that the shear modulus G and the viscosity coefficient η of the soil can be obtained from the linear segment of the curve. When the shear stress exceeds a certain yield value, the curve becomes non-linear. Linear, this yield value can be considered as the long-term strength of the soil. These parameters are a function of time in rheological tests.