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使用河海大学TSW-40型真三轴仪,对粗粒土分别进行平面应变和常规三轴压缩试验,研究了粗粒土在平面应变条件下的应力-应变关系及各种应变之间的关系,包括:主应力差1-3(2-3)与大主应变1、主应力比1/3(2/3)与大主应变1、球应力p与体积应变v、偏应力q与偏应变s、广义应力比q/p与广义剪应变s、小主应变3与大主应变1、体积应变v与广义剪应变s之间的关系。试验结果表明,对于相同的3,平面应变试验的(1-3)(或1/3)-ε1曲线位于常规三轴压缩试验相应曲线的上方;3大的(1-3)(或2-3)-1曲线在上方,而3大的1/3(或2/3)-1曲线在下方;对于相同的3,在相同的1下,平面应变条件下的小主应力方向膨胀量要比常规三轴压缩条件下的大;产生相同的s时,3越大,v越大,对于相同的3,平面应变条件下的v要比常规三轴压缩条件下的大;粗粒土在平面应变和常规三轴压缩条件下加荷时,具有归一化的双曲线应力-应变关系。研究表明,采用非线性弹性模型计算粗粒土的平面应变问题时,有必要考虑弹性模量E和泊松比的各向异性。
Using the TSW-40 true triaxial apparatus of Hohai University, the plane strain and the conventional triaxial compression tests were carried out on the coarse grained soil respectively. The stress-strain relationship of the coarse grained soil under the plane strain condition and the relationship between various strains The relationships include: primary stress difference 1-3 (2-3) vs. primary strain 1, primary stress ratio 1/3 (2/3) vs. primary strain 1, ball stress p vs. volume strain v, deviatoric stress q The relationship between the partial strain s, the generalized stress ratio q / p and the generalized shear strain s, the small principal strain 3 and the principal strain 1, the volume strain v and the generalized shear strain s. The experimental results show that the (1-3) (or 1/3) -ε1 curve of the plane strain test lies above the corresponding curve of the conventional triaxial compression test for the same 3. The three large (1-3) (or 2- 3) -1 curve is above and the 3 major 1/3 (or 2/3) -1 curve is below; for the same 3, the direction of small principal stress directional expansion at the same 1 plane strain is Is larger than that under conventional triaxial compression conditions; when the same s is generated, the larger the value of 3 and the larger the value of v, the larger the value of v under the plane strain condition than that under the conventional triaxial compression condition; The normalized hyperbolic stress-strain relationship is obtained when the sample is loaded under the condition of plane strain and conventional triaxial compression. The research shows that it is necessary to consider the anisotropy of elastic modulus E and Poisson’s ratio when using the nonlinear elastic model to calculate the plane strain of coarse grained soil.