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提出一种能够缩短掺砾心墙料大三轴排水剪试验时间的方法,即降低掺砾心墙料中细粒的含量。掺砾心墙料的强度和变形主要取决于粗粒部分,试验表明,适量降低细粒的含量,没有改变原级配试样应力应变曲线的基本特征。而细粒含量的降低,可以有效地提高试验过程中的排水速率。给出了降低的细粒含量与渗透系数之间的关系,给出了降低细粒含量的掺砾心墙料大三轴试验步骤,以及确定邓肯模型参数的简化方法。
A method to shorten the test time of large-scale triaxial drainage shears with gravel core material is to reduce the content of fine particles in the core material. The strength and deformation of the adulterated core wall material mainly depend on the coarse fraction. Experiments show that reducing the content of the fine particles by proper amount does not change the basic characteristics of the stress-strain curve of the primary sample. The reduced content of fine particles, can effectively improve the drainage rate during the test. The relationship between the reduced fine fraction and the permeability coefficient is given, the large triaxial test steps of the gravel core material to reduce the fine fraction and the simplified method to determine the Duncan model parameters are given.