黄土邓肯张模型有限元计算参数的试验

Experiments on Parameters of Duncan-Chang Model for Loess

为配合有限元计算分析的需要，从工地现场取样，进行了黄土的室内三轴试验，并对试验结果进行了分析，得到了邓肯-张非线性模型有限元计算的8个参数。黄土的有限元参数随着试样的压实度和试验时围压的不同而变化。在含水量保持不变的情况下，邓肯-张E～μ模型的8个参数中，参数K、n、Rf、C、φ、G均随压实度的提高而增大；F、D随K的变化规律不明显。在含水量和压实度保持不变的情况下进行三轴试验，土样的（σ1-σ3）f、（σ1-σ3）ult、Ei、Rf均随σ3的增大而增大，μi随σ3的增大而减小，D随σ3变化的规律不明显。

In order to meet the needs of the computation with the finite element method, using the loess samples taken from the construct site, the triaxial experiment of loess is carried out to get the eight parameters of Duncan-chang （E-μ） Model. The parameters of finite element for loess are changed with the degree of compaction and the surrounding pressure. When the moisture is kept constant, six parameters （K,n,Rf,C, φ,G） in Duncan-chang （E-μ） Model are changed to larger and larger with the increasing of the degree of compaction; and the other two parameters （F,D） have no obvious changing rule. When the moisture content and the degree of compaction are kept constant, the triaxial experiment is carried out, the sample＇s （σ1-σs）f, （σ1-σ3）ult, Ei and Rf are changed to larger and larger with increasing of the surrounding pressure; and μi is changed to smaller and smaller, D has no obvious changing rule. 3 tabs, 6 figs, 6 refs.