堆石体在真三轴应力状态下的非共轴性与剪胀特性
发布时间：2018-08-29 10:30
【摘要】：基于连续-离散耦合分析方法,发展随机颗粒不连续变形分析方法。采用不规则多面体模拟实际堆石颗粒,制备初始各向同性的堆石料数值试样,进行等平均静水压力p、等中主应力系数b应力路径的真三轴数值试验。分析堆石料在真三轴应力状态下的剪胀特性,以及应变增量与应力增量的非共轴性。研究结果表明:刚开始加载时,应变增量与应力增量共轴,随着加载的进行,应变增量的方向发生偏转,偏转量与中主应力系数b有关,在三轴压缩应力路径(b=0)和三轴拉伸应力路径(b=1)时,几乎不发生偏转;对比Rowe,Roscoe,改进的Roscoe以及Lagioia剪胀模型,改进的Roscoe剪胀模型预测的剪胀曲线与数值试验结果较吻合,在改进的Roscoe剪胀模型上引入1个角隅函数,以反映中主应力对剪胀特性的影响。
[Abstract]:Based on the continuous-discrete coupling analysis method, the random particle discontinuous deformation analysis method is developed. Using irregular polyhedron to simulate the actual rockfill particles, the initial isotropic numerical specimens of rockfill were prepared, and the true triaxial numerical tests of the iso-mean hydrostatic pressure p and the isometric principal stress coefficient b stress path were carried out. The shear expansion characteristics of rockfill under true triaxial stress and the non-coaxial properties of strain increment and stress increment are analyzed. The results show that at the beginning of loading, the strain increment is coaxial with the stress increment. With the loading, the direction of the strain increment deflects, and the deflection is related to the coefficient b of the middle principal stress. In the case of triaxial compression stress path (b0) and triaxial tensile stress path (bt1), there is almost no deflection. Compared with the Rowe,Roscoe, improved Roscoe and Lagioia shear expansion models, the predicted shear expansion curve of the modified Roscoe expansion model is in good agreement with the numerical test results. A corner function is introduced to the improved Roscoe expansion model to reflect the effect of the principal stress on the dilatancy.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家自然科学基金资助项目(51379161,51509190) 中央高校基本科研业务费专项资金资助项目(2042015kf0022) 博士后科学基金面上资助项目(2015M572195)~~
【分类号】：TV41
，
本文编号：2210928
[Abstract]:Based on the continuous-discrete coupling analysis method, the random particle discontinuous deformation analysis method is developed. Using irregular polyhedron to simulate the actual rockfill particles, the initial isotropic numerical specimens of rockfill were prepared, and the true triaxial numerical tests of the iso-mean hydrostatic pressure p and the isometric principal stress coefficient b stress path were carried out. The shear expansion characteristics of rockfill under true triaxial stress and the non-coaxial properties of strain increment and stress increment are analyzed. The results show that at the beginning of loading, the strain increment is coaxial with the stress increment. With the loading, the direction of the strain increment deflects, and the deflection is related to the coefficient b of the middle principal stress. In the case of triaxial compression stress path (b0) and triaxial tensile stress path (bt1), there is almost no deflection. Compared with the Rowe,Roscoe, improved Roscoe and Lagioia shear expansion models, the predicted shear expansion curve of the modified Roscoe expansion model is in good agreement with the numerical test results. A corner function is introduced to the improved Roscoe expansion model to reflect the effect of the principal stress on the dilatancy.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家自然科学基金资助项目(51379161,51509190) 中央高校基本科研业务费专项资金资助项目(2042015kf0022) 博士后科学基金面上资助项目(2015M572195)~~
【分类号】：TV41
，
本文编号：2210928
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