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采用离散元方法,利用半径扩展法和重力沉积法分别生成具有初始各向同性和各向异性内结构的试样,并开展三轴不排水压缩和拉伸试验,研究不同制样方法产生的初始各向异性对砂土宏微观力学特性及其临界状态的影响。运用组构张量对砂土的各向异性进行量化,分析不同初始组构各向异性对组构张量演化的影响并确定了组构张量的临界值。试验结果表明:初始组构各向异性对试样的剪胀性有重要影响,由于受重力影响形成初始各向异性,其各向异性程度越大、组构方向与加载方向越一致,剪胀性越显著;初始组构各向异性对试样的临界状态没有影响,砂土的组构张量具有唯一的临界状态值。
Discrete element method was used to generate samples with initial isotropic and anisotropic internal structure respectively by radius expansion method and gravity deposition method. The three-axis undrained compression and tensile test were carried out to study the initial Influence of Anisotropy on Macroscopic Mechanical Properties and Critical State of Sandy Soil. The anisotropy of sand is quantified using the tensor of structure, and the influence of anisotropy of different initial structures on the tensor evolution of the structure is analyzed. The critical value of the tensor of structure is determined. The experimental results show that the anisotropy of the initial structure has an important influence on the dilatancy of the sample. Since the initial anisotropy is caused by the influence of gravity, the greater the degree of anisotropy, the more uniform the orientation of the structure is to the loading direction. The dilatancy The more pronounced the property is, the anisotropy of the initial structure has no influence on the critical state of the specimen, and the constitutive tensor of sand has the only critical state value.