基于三维颗粒离散元法的喷射混凝土单轴抗压试验研究

发布时间：2018-04-16 13:25

  本文选题：喷射混凝土 + 三维颗粒离散法　； 参考：《混凝土》2017年04期

【摘要】：以喷射混凝土室内单轴抗压试验为基础,研究喷射混凝土单轴抗压试验的三维颗粒离散元模拟方法。根据平行黏结模型的黏结尺寸理论,将室内试验级配进行合理简化,建立三维数值力学试验模型。研究试件在数值试验中的受力全过程和细观破坏形态,得到试验数据,绘制应力-应变曲线和裂缝数-荷载步曲线,与室内试验结果进行对比分析。结果表明:利用简化模型,可提高计算速率;三维颗粒离散元单轴抗压试验模拟获得的喷射混凝土强度特性、微观裂缝的发展过程和试件破坏特点与室内试验结果吻合;三维颗粒离散元法可以描述喷射混凝土这类具有明显非连续性特征材料在单轴受压状态下的细观破坏特征,为研究其在复杂受力条件下的破坏机理奠定基础。
[Abstract]:Based on the uniaxial compression test of shotcrete in laboratory, the three-dimensional particle discrete element simulation method for uniaxial compression test of shotcrete is studied.According to the size theory of the parallel bonding model, the laboratory test grading was reasonably simplified, and the three-dimensional numerical mechanical test model was established.In this paper, the whole force process and the mesoscopic failure pattern of the specimen in numerical test are studied, and the experimental data are obtained, the stress-strain curve and crack number-load step curve are drawn, and the results are compared with the results of indoor test.The results show that the calculation rate can be increased by using the simplified model, and the strength characteristics of shotcrete, the development process of micro-cracks and the failure characteristics of the specimens obtained by uniaxial compression test of three dimensional particle discrete element are in agreement with the results of laboratory tests.Three-dimensional particle discrete element method can describe the mesoscopic failure characteristics of shotcrete with obvious discontinuous characteristics under uniaxial compression, which lays a foundation for studying the failure mechanism of shotcrete under complex loading conditions.
【作者单位】： 西南交通大学土木工程学院交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金(51478396);国家自然科学基金(51678503)
【分类号】：TU528.53
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本文编号：1759140