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已有研究表明,土石坝内堆石料在填筑期的应力路径可近似为等应力比的路径。根据等应力比三轴排水剪切试验,介绍了一个三模量增量非线性模型,即模型除给出堆石体积模量K和剪切模量G的表达式外,对剪应力产生的体变和平均主应力产生的剪切应变也采用了交叉模量J表达。采用粒子群优化算法通过全量本构关系曲线确定增量模型参数。通过对试验数据的拟合发现,三模量模型可以较好地反映堆石料的应力与变形特性。
Studies have shown that the stress path of rockfill dam within the filling period can be approximated as the path of equal stress ratio. According to the triaxial shear tests with equal stress ratios, a three-modulus increment nonlinear model is introduced. In addition to the expressions for the bulk modulus K and shear modulus G of the rockfill, The shear strain induced by bulk deformation and average principal stress also adopts the crossover modulus J expression. The Particle Swarm Optimization (PSO) algorithm is used to determine the incremental model parameters through the full constitutive relationship curve. Through fitting the test data, it is found that the three modulus model can well reflect the stress and deformation characteristics of rockfill materials.