水布垭堆石料三轴试验数值模拟

Numerical Simulation of Triaxial Test of the Shuibuya Rockfill Material

采用三轴仪对水布垭堆石料进行相同密度、围压分别为0.2、0.6、0.8、1.0 MPa下的固结排水剪切试验,并根据试验规程整理得出水布垭堆石料基于邓肯E-B模型的8个基本参数。研究的目的在于数值模拟不受室内三轴试验不确定性因素的影响,同时所做试验的轴向应变为25%左右,在国内很少见。通过自编邓肯E-B Fortran子程序,嵌入商用软件ABAQUS对水布垭堆石料三轴试验进行数值模拟。通过将模拟得到的应力—应变关系与三轴试验得到的应力—应变关系进行对比分析发现,数值模拟结果与试验结果基本吻合。

By using triaxial apparatus to do consolidation drained shear tests under different confining pressures of 0.2 MPa,0.6 MPa,0.8 MPa and 1.0 MPa respectively with the same density of Shuibuya rockfill material,and according to the test code we got eight basic parameters based on Duncan EB Model of Shuibuya rockfill material. Purpose of the research on numerical simulation was not affected by uncertainty factors of the indoor triaxial test,at the same time the axial strain that we did was about 25%,which was very rare in China. By self compiling the Duncan EB Fortran subroutine,it embedded into commercial software ABAQUS for numerical simulation of triaxial test of Shuibuya rockfill material. By comparing the stress strain relationship of the numerical simulation to the triaxial test,we had found out that the results of numerical simulation and experimental results were basically consistent.