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获取寒区工程设计中冻土的物理力学指标及冻土本构模型中的模型参数都离不开冻土的力学试验.随着对冻土力学性质研究的深入,需要考察更多加载路径下冻土的力学行为,这也是检验已有冻土本构模型的有效途径.因此,精确的冻土力学试验是认识冻土力学性质的基本手段.为进一步考察冻土的力学性质,提高冻土力学试验的精度,应用MTS-810低温三轴仪及其配套的控制软件,在该设备上对冻土进行了两种各向等压试验和两种三轴剪切加卸载试验.根据试验结果,分析了这几种试验方法的适用范围,为考察等效剪应力对冻土试样体积变形的影响,提出了在MTS-810低温三轴仪上实现冻土等p试验的具体试验方案.
Obtaining the physical and mechanical indexes of frozen soil in cold engineering design and the model parameters of frozen soil constitutive model can not be separated from the mechanical tests of frozen soil.With the further research on the mechanical properties of frozen soil, Which is also an effective way to test the existing frozen soil constitutive model.Therefore, the accurate test of frozen soil mechanics is the basic means to recognize the mechanical properties of frozen soil.To further investigate the mechanical properties of frozen soil, the permafrost Mechanical test accuracy, the application of MTS-810 low temperature triaxial apparatus and its associated control software, the device on the frozen soil two isotropic pressure test and two kinds of three-axis shear loading and unloading test according to the test results In order to investigate the effect of equivalent shear stress on the volumetric deformation of frozen soil samples, a specific experimental scheme for realizing p test of frozen soil on MTS-810 low temperature triaxial apparatus is proposed.