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针对常规的等向固结剪切试验不能反映实际工程中复杂应力路径对土体力学特性的影响,采用GDS应力路径三轴仪,对华南地区广泛分布的花岗岩残积土进行了不同固结条件下的不排水剪切试验,探讨不同初始平均有效主应力p’c与初始应力比ηc对其不排水特性的影响。结果表明:在初始应力比相同的情况下,初始平均有效主应力越大,花岗岩残积土的不排水剪切强度越大,破坏时的孔压也越大;在初始平均有效主应力相同的情况下,初始应力比越大,花岗岩残积土的不排水剪切强度越大,而破坏时的孔压越小。然而,e-p’-q三维空间中的临界状态线是唯一的,不受初始平均有效主应力和初始应力比影响。
The conventional isotropic consolidation shear test can not reflect the effect of complex stress paths on the mechanical properties of soil. The GDS stress path triaxial apparatus is used to test the distribution of widely distributed granite remnant in South China under different consolidation conditions Of the undrained shear test to explore the different initial average effective primary stress p’c and initial stress ratio ηc its undrained characteristics. The results show that under the same initial stress ratio, the greater the initial average effective principal stress, the greater the undrained shear strength of granite residual soil and the greater the pore pressure during failure. When the initial average effective principal stress is the same , The greater the initial stress ratio, the greater the undrained shear strength of granite residual soil and the smaller the pore pressure at failure. However, the critical state line in the e-p’-q three-dimensional space is unique, independent of the initial mean effective principal stress and the initial stress ratio.