基于细观损伤力学试验的大理岩单轴压缩统计损伤模型

发布时间：2018-05-02 09:22

本文选题：岩土力学 + 统计损伤模型　；参考：《水力发电学报》2015年05期

【摘要】：通过对取自四川锦屏大理岩试样进行基于扫描电镜的细观损伤力学全程数字化跟踪试验,并对试验结果进行统计分析,得到在单轴压缩过程中微裂纹间距服从变参数的广义极限分布这一结论。基于此,根据宏、细观损伤力学理论描述损伤的特征,在内变量不可逆热力学理论框架下,应用能量耗散原理建立包含宏细观两个尺度损伤信息的统计损伤模型。最后,应用此模型模拟得到大理岩单轴压缩的应力-应变关系及三个损伤变量的发展过程。研究结果表明,模型应力应变曲线处于试验应力应变曲线包络线内,并且包含细观损伤信息的损伤变量D比由宏观物理力学参数角度定义的损伤变量KD、GD对损伤更为敏感,且三个损伤变量的发展具有明显的阶段性。
[Abstract]:Based on scanning electron microscope (SEM), the whole process of digital tracking test of damage mechanics of marble samples from Jinping, Sichuan Province was carried out, and the results were statistically analyzed. A conclusion is obtained that the distance between microcracks is generalized limit distribution with variable parameters during uniaxial compression. Based on this, the damage characteristics are described according to the theory of macro and meso damage mechanics. Under the framework of irreversible thermodynamics theory of internal variables, a statistical damage model containing macro and meso-scale damage information is established by applying the energy dissipation principle. Finally, the stress-strain relationship of marble under uniaxial compression and the development process of three damage variables are obtained by using this model. The results show that the stress-strain curve of the model is in the envelope of the experimental stress-strain curve, and the damage variable D with meso-damage information is more sensitive to damage than the damage variable KDGD-defined from the angle of macroscopic physical and mechanical parameters. And the development of the three damage variables has obvious stages.
【作者单位】：平湖市建筑工程质量监督站;绍兴文理学院土木工程学院;嘉兴学院建筑工程学院;河海大学岩土工程科学研究所;
【基金】：国家自然科学基金青年项目(51409122) 浙江省自然科学基金青年基金项目(LQ12E08004) 浙江省教育厅科研项目(Y201018524)
【分类号】：TU45

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