周期性荷载作用下岩石力学特性数值模拟研究
发布时间：2019-01-08 07:58
【摘要】：为研究周期性荷载作用下岩石的力学特性,开展了基于离散单元法(DEM)的岩石疲劳数值模拟试验,通过模拟单轴压缩试验研究了数值模型中微观参数对试样宏观参数的影响,再通过数值疲劳试验研究了砂岩的疲劳变形特性。结果表明,砂岩的疲劳应力—应变曲线受控于单轴应力—应变过程曲线,疲劳破坏时的轴向应变即为周期性荷载最大应力在单轴应力—应变曲线中所对应的峰后部分应变。通过分析砂岩的疲劳渐进破坏过程发现,最大应力和平均应力是影响砂岩疲劳寿命的两个重要因素。研究成果对于了解岩体疲劳破坏机理、合理评价工程稳定性有重要意义。
[Abstract]:In order to study the mechanical properties of rock under cyclic loading, a numerical simulation test of rock fatigue based on discrete element method (DEM) was carried out. The influence of microscopic parameters on the macroscopic parameters of the specimen was studied by simulating uniaxial compression test. The fatigue deformation characteristics of sandstone are studied by numerical fatigue test. The results show that the fatigue stress-strain curve of sandstone is controlled by the uniaxial stress-strain process curve, and the axial strain during fatigue failure is the partial strain corresponding to the maximum stress of cyclic load in the uniaxial stress-strain curve. By analyzing the progressive fatigue failure of sandstone, it is found that the maximum stress and the average stress are two important factors affecting the fatigue life of sandstone. The research results are of great significance for understanding the fatigue failure mechanism of rock mass and evaluating engineering stability reasonably.
【作者单位】： 四川大学水利水电学院水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金项目(51379139)
【分类号】：TV223
本文编号：2404323
[Abstract]:In order to study the mechanical properties of rock under cyclic loading, a numerical simulation test of rock fatigue based on discrete element method (DEM) was carried out. The influence of microscopic parameters on the macroscopic parameters of the specimen was studied by simulating uniaxial compression test. The fatigue deformation characteristics of sandstone are studied by numerical fatigue test. The results show that the fatigue stress-strain curve of sandstone is controlled by the uniaxial stress-strain process curve, and the axial strain during fatigue failure is the partial strain corresponding to the maximum stress of cyclic load in the uniaxial stress-strain curve. By analyzing the progressive fatigue failure of sandstone, it is found that the maximum stress and the average stress are two important factors affecting the fatigue life of sandstone. The research results are of great significance for understanding the fatigue failure mechanism of rock mass and evaluating engineering stability reasonably.
【作者单位】： 四川大学水利水电学院水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金项目(51379139)
【分类号】：TV223
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