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为研究中主应力系数和大主应力方向角对各向异性软黏土变形特性的影响,利用GDS空心圆柱扭剪仪对温州原状软黏土进行了一系列不同中主应力系数和大主应力方向角的排水定向剪切试验。试验过程中在大主应力方向角和中主应力系数不变的条件下,逐渐增加剪应力直至试样破坏。分析了中主应力系数和大主应力方向角对温州原状土偏应力与大主应变关系、体应变、中主应变和小主应变与大主应变关系的影响。试验结果表明:试样的应力-应变关系在中主应力系数和大主应力方向角不同时表现出明显的各向异性。当中主应力系数为0.00和1.00时,大主应力方向角对应力-应变关系的影响较小;而当中主应力系数为0.50时,应力-应变关系中的割线剪切模量随大主应力方向角变化明显。当大主应力方向角为30°时,随着中主应力系数从0.00增加到0.50,中主应变由压缩状态变为拉伸状态;当大主应力方向角为45°时,随着中主应力系数从0.00增加到1.00,中主应变由压缩状态变为拉伸状态。
In order to study the influence of the main stress coefficient and the main stress direction angle on the deformation characteristics of anisotropic soft clay, a series of different medium principal stress coefficients and large principal stress direction angles Drainage directed shear test. During the test, under the condition of the main principal stress direction angle and the medium principal stress coefficient unchanged, the shear stress is gradually increased until the specimen is destroyed. The relationship between the principal stress and the principal stress and the relationship between the principal stress and the principal strain, the relationship between the bulk strain and the principal strain and the principal strain were analyzed. The experimental results show that the stress-strain relationship of the specimen shows obvious anisotropy when the principal stress coefficient and the principal direction of principal stress are different. When the principal stress coefficient is 0.00 and 1.00, the influence of the principal stress direction angle on the stress-strain relationship is small. When the principal stress coefficient is 0.50, the secant shear modulus in the stress-strain relationship changes with the principal stress The direction angle changes obviously. When the principal stress direction angle is 30 °, as the middle principal stress coefficient increases from 0.00 to 0.50, the middle main strain changes from the compressed state to the stretched state. When the main principal stress direction angle is 45 °, The stress coefficient increases from 0.00 to 1.00, and the main strain changes from a compressed state to an extended state.