堆石料等应力比路径四模量增量非线性模型

已有研究表明，土石坝内堆石料在施工填筑期的应力路径可近似为主应力比为常数的路径。根据大型三轴仪上进行的两种应力路径排水试验，即等向压缩的固结试验和等应力比值的剪切试验，提出了一个四模量增量非线性模型。模型除给出了堆石料体积模量K和剪切模量G的表达式外，对剪应力产生的体积应变和平均主应力产生的剪切应变也分别采用了交叉模量J1、J2表达。通过与试验数据的对比表明，四模量增量非线性模型能够较好地预测堆石料在等应力比路径下的应力-应变关系。

Four moduli incremental nonlinear model of rockfill under the path of constant stress ratio

Current researches indicate that the stress path of rockfill dam during dam construction can be approximated as that the principal stress ratio keeps constant. According to the triaxial drained tests conducted in large scale triaxial apparatus under two types of stress path, which are isotropic consolidation tests and shearing tests of constant stress ratio, a four moduli incremental nonlinear model was proposed. The model can not only present functional expressions of bulk modulus K and shear modulus G of rockfill, but also calculate volumetric strain produced by shearing stress and shearing strain produced by mean principal stress with the coupling modulus J1 and J2. Compared with the test data, the model can present good predictions of the stress-strain relationships of rockfill under the path of constant stress ratio.