| 基于颗粒离散元法描述岩石断面形貌的方法研究 |
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| 引用本文： | 丛怡,王在泉,张黎明,丛宇.基于颗粒离散元法描述岩石断面形貌的方法研究[J].防灾减灾工程学报,2020(1):43-50. |
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| 作者姓名： | 丛怡 王在泉 张黎明 丛宇 |
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| 作者单位： | 青岛理工大学土木工程学院，山东 青岛 266033 |
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| 基金项目： | 国家自然科学基金(41472270)、中科院岩土力学与工程国家重点实验室开放基金（Z016012）、山东省重点研发计划（2017GSF216010，2017GSF16109）资助 |
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| 摘 要： | 破裂面作为岩石破坏之后最为直观的观测对象,其中蕴含着大量与破坏过程相关的细观信息,通过室内断口粗糙度扫描试验对破裂面进行分析不仅耗时耗力,而且试样最终断裂表面覆有大量白色岩粉会导致破裂面信息在扫描过程中出现不同程度的丢失。因此提出一种基于数值模拟的细观破裂面拟合方法,通过PFC~(3D)对不同应力路径下大理岩的变形破坏过程进行细观模拟,基于裂纹形成过程中的三类位移场与破裂面之间的关系,对试样最终破裂面进行提取与重建。结果表明:通过该方法拟合所得破裂面同室内试验所得真实岩样破裂面的粗糙度信息及破坏特征基本一致,可以很好地反映不同应力路径下试样破裂面的差异性。
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| 关 键 词： | 岩石 破裂面 PFC3D 损伤分析 |
Study on a Method of Describing the Rock Fracture Surface based on PFC3D |
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| CONG Yi,WANG Zaiquan,ZHANG Liming,CONG Yu.Study on a Method of Describing the Rock Fracture Surface based on PFC3D[J].Journal of Disaster Prevent and Mitigation Eng,2020(1):43-50. |
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| Authors: | CONG Yi WANG Zaiquan ZHANG Liming CONG Yu |
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| Affiliation: | School of Civil Engineering , Qingdao University of Technology , Qingdao 266033 , China |
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| Abstract: | The fracture surface is the most intuitive observation object after rock destruction, which contains much detailed information related to the destruction process. It is not only time-consuming and labor-consuming to analyze the fracture surface employing indoor fracture roughness scanning test, but also a large amount of white rock powder covering the final fracture surface of the specimen will lead to the loss of fracture surface information in different degrees during the scanning process. Therefore, this paper proposes a method of micro-fracture surface fitting based on numerical simulation, which simulates the deformation and failure process of marble under different stress paths by PFC3D. The extracts and reconstructs the final fracture surface of samples based on the relationship between three types of the displacement field and fracture surface in the process of crack formation. The results show that the roughness information and failure characteristics of the fracture surface fitted by this method are consistent with those of the real rock samples obtained from laboratory tests, and can well reflect the difference of the fracture surface under different stress paths. |
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