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采用研制的真三轴仪进行水泥土单向加荷试验,研究水泥土的各向异性变化规律,探讨应力对侧向膨胀的影响。结果表明,单向加荷条件下,加荷方向均产生压缩,而侧向膨胀主要与剪应力增量△q有关;大主应力σ1单向加荷,△q>0,中主应力σ2、小主应力σ3方向产生侧向膨胀;中主应力单向加荷,△q>0时,σ3方向产生侧向膨胀,△q<0时,无侧向膨胀;小主应力单向加荷,△q<0,试样不产生侧向膨胀;对于相同应力增量,试样侧向膨胀和压缩应变均随初始固结应力的增大而减小。能量分析表明,试样的侧向膨胀与某一方向的约束程度相关,约束越强,侧向膨胀量越小;约束越弱,侧向膨胀量越大。
The true triaxial apparatus was used to carry out the unidirectional loading test of cement soil to study the anisotropic variation of cement soil and the influence of stress on lateral expansion. The results show that under the unidirectional loading condition, the compressive direction is both compressive and the lateral expansion is mainly related to the increment of shear stress △ q. The main stress σ1 is unidirectional, △ q> 0, the middle principal stress σ2, The main stress σ3 direction of the lateral expansion; the main stress unidirectional loading, △ q> 0, σ3 direction lateral expansion, △ q <0, no lateral expansion; small main stress unidirectional loading, △ q <0, the sample does not produce lateral expansion; for the same stress increment, the specimen lateral expansion and compressive strain decrease with the increase of initial consolidation stress. Energy analysis shows that the lateral expansion of the specimen is related to the degree of restraint in a certain direction. The stronger the restraint is, the smaller the lateral expansion is; the weaker the restraint is, the larger the lateral expansion is.