初始應(yīng)力線和原狀土的修正Mohr-Coulomb準(zhǔn)則
[Abstract]:The reason why there is significant difference in mechanical properties between undisturbed soil and remolded soil lies in the structure based on the initial stress state. The remolded soil is generally isotropic, so the yield surface of the remolded soil is on the axis of isoclinic in three dimensional stress space. Because the undisturbed soil has been in the state of three direction unequal compression during the forming process, theoretically speaking, the yield surface of the undisturbed soil can no longer be regarded as the axis of equitilting line, but with the initial stress line as the axis. Taking a true triaxial test as an example, the variation characteristics of generalized shear stress corresponding to a specific octahedron strain with the loading angle are studied in this paper. Then, based on the generalized plastic mechanics and the initial stress state of the undisturbed soil, the concept of the initial stress line is proposed, and the relationship between the initial stress line and the isoclinic line is studied. Furthermore, three modified Mohr-Coulomb yield criteria for undisturbed soils, i.e., translation mode, shrinkage mode and rotation mode, are presented. In the translation mode, the yield trace line of the contraction mode is still located on the 蟺 plane, while the yield trace line of the rotation mode is located on the 蠂 plane perpendicular to the initial stress line. The former two models can be used to evaluate the structure of undisturbed soil directly through the results of iso-true triaxial test. The last model can be used to study the structure and anisotropy of the undisturbed soil by mapping the true triaxial test data of 1 K0 / 2 K0 / 3 / c or equip triaxial test data on the 蠂 plane. The results show that the modified Mohr-Coulomb yield criterion can better reflect the structure of the undisturbed soil and the physical meaning is clear and clear.
【作者單位】: 天津城建大學(xué)土木工程學(xué)院;天津市軟土特性與工程環(huán)境重點實驗室;新鄉(xiāng)學(xué)院土木工程與建筑系;
【基金】:國家自然科學(xué)基金項目(41472253) 天津市自然科學(xué)基金重點項目(16JCZDJC39000)
【分類號】:TU411.7
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