岩石材料的一种非线性三参数强度准则及应用

发布时间：2018-06-12 23:27

本文选题：岩石 + 强度准则　；参考：《岩土力学》2017年12期

【摘要】：为了更好地描述岩石材料在多种复杂应力作用下的强度状态,在已提出的双T~2强度理论基础上,建立了一种新的非线性三参数强度准则。通过与Westerly花岗岩等5种岩石材料试验数据的比较,对准则在σ_1=σ_2σ_3,σ_1σ_2=σ_3,σ_3=0、σ_10、σ_20,σ_30和σ-τ 5种复杂应力状态下的合理性和适用性进行了讨论。研究表明:待定系数A、B、C可通过简单的试验确定且具有明确的物理意义;不同岩石材料的极限应力比α和β对应不同的强度理论;非线性三参数强度准则的π平面迹线介于单剪强度理论和Mises准则、双剪强度理论之间,符合各向同性材料屈服面三轴对称和外凸的公设;理论预测曲线可反映岩石材料中主应力效应的区间性与静水压力效应,并与多种岩石材料在复杂应力状态下的强度变化趋势基本吻合。
[Abstract]:In order to better describe the strength state of rock materials under various complex stresses, a new nonlinear three-parameter strength criterion is established on the basis of the proposed double Tn-2 strength theory. By comparing with the experimental data of five kinds of rock materials, such as Westerly granite, the reasonableness and applicability of the criterion under the complex stress states of 蟽 _ 1 = 蟽 _ S _ 2 蟽 _ 3, 蟽 _ 1 蟽 _ 2 = 蟽 _ 3, 蟽 _ 3 _ T _ 0, 蟽 _ 10, 蟽 _ S _ 20, 蟽 _ S _ 30 and 蟽 ~-蟿 are discussed. The results show that the undetermined coefficient A (B) C can be determined by simple test and has definite physical significance, and the ultimate stress ratio 伪 and 尾 of different rock materials correspond to different strength theory. The 蟺 plane trace of the nonlinear three-parameter strength criterion lies between the single shear strength theory and Mises criterion, and the double shear strength theory, which accords with the postulates of triaxial symmetry and convex yield surface of isotropic material. The theoretical prediction curve can reflect the interval effect of principal stress effect and hydrostatic pressure effect in rock materials, and it is basically consistent with the change trend of strength of various rock materials under complex stress state.
【作者单位】：沈阳工业大学建筑与土木工程学院;
【基金】：国家自然科学基金(No.51279109)~~
【分类号】：TU45

【相似文献】