【摘要】 采用大型三轴试验机,对粗粒料进行了常规三轴、等p和等应力比等不同应力路径的试验。通过对试验结果进行对比分析,研究了粗粒料在不同应力路径下的应力-应变、变形和强度特性,并对粗粒料的卸载体缩现象进行了分析和探讨。结果表明,应力路径对粗粒料的应力-应变和变形特性影响较大,而对强度特性影响较小;卸载体缩主要是由偏应力比η的变化所引起的,与应力路径关系很大。更多还原

【Abstract】 A series of large-scale triaxial tests under different stress paths are performed,including the conventional triaxial tests,constant p tests and constant stress ratio tests.Based on the comparison of test results,the stress-strain,deformation and strength characteristics of a coarse-grained material under different stress paths are investigated.Meanwhile,the phenomena of the volume-contraction in unloading is discussed.The test results indicate that the stress path has obvious influence on the stress-strain and deformation characteristics of the coarse-grained material,but little influence on strength characteristics.The volume-contraction in unloading of the coarse-grained material is caused by the change of deviatoric stress ratio and is related to stress path of test.更多还原