砂土应力路径试验的数值模拟

Numerical simulation of stress path tests on sand

在一组应力路径试验的基础上,利用砂土的状态相关本构模型,对不同应力路径下饱和砂土在三轴固结排水剪切过程中的变形特性进行模拟。将模拟结果与试验结果进行比较,发现这种状态相关本构模型不仅能够较好地模拟出不同应力路径下砂土固结排水试验的应力–应变关系和紧砂的应变软化现象,而且能够反映出砂土的剪缩和剪胀等变形特性,但是在模拟拉伸应力路径下砂土的体积应变变化趋势方面有待于进一步的研究和改进。

Based on a set of stress path tests, numerical simulation of the deformation behavior of saturated sand in triaxial consolidation and drained tests under different stress paths was carried out by use of the state-dependent sand model. The results of numerical simulation were discussed. Compared with the test results, the model simulation broadly matched the test results under different stress paths in terms of both the shear stress-strain response and volumetric characteristics. Generally speaking, the above model could reflect most of the deformation behavior of sand except some limitations on the volumetric change process under triaxial extension path, and it should be further studied and improved.