基于多晶离散元法的砂岩三轴压缩损伤特性

doi:10.12068/j.issn.1005-3026.2020.07.010

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (7): 968-974.DOI: 10.12068/j.issn.1005-3026.2020.07.010

基于多晶离散元法的砂岩三轴压缩损伤特性

付腾飞¹，徐涛¹，朱万成¹，王兴伟²

(1.东北大学资源与土木工程学院，辽宁沈阳110819； 2.东北大学计算机科学与工程学院，辽宁沈阳110169)

收稿日期:2019-12-10 修回日期:2019-12-10 出版日期:2020-07-15 发布日期:2020-07-15
通讯作者: 付腾飞
作者简介:付腾飞(1992-)，男，山西长治人，东北大学博士研究生；徐涛(1975-)男，湖北随州人，东北大学教授，博士生导师；朱万成(1974-)，男，新疆呼图壁人，东北大学教授，博士生导师；王兴伟(1968-)，男，辽宁盖州人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51974062，41672301);国家自然科学基金国际合作与交流项目(51811530312，51761135102)；中央高校基本科研业务费专项资金资助项目(N180101028).

Damage Characteristics of Sandstone Under Triaxial Compression Based on Polycrystalline Discrete Element Method

FU Teng-fei¹， XU Tao¹， ZHU Wan-cheng¹， WANG Xing-wei²

1.School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2.School of Computer Science & Engineering， Northeastern University， Shenyang 110169， China.

Received:2019-12-10 Revised:2019-12-10 Online:2020-07-15 Published:2020-07-15
Contact: XU Tao
About author:-
Supported by:
-

摘要/Abstract

摘要： 利用开源软件Neper生成Voronoi晶粒镶嵌体导入3DEC，建立考虑砂岩矿物成分的三维Voronoi多晶离散元模型.基于砂岩的实验室常规三轴压缩试验结果，进行了砂岩细观模型参数标定，开展了三轴压缩条件下非均质砂岩的细观损伤演化过程模拟.研究结果表明，低围压下岩石中产生的微裂纹主要为拉裂纹，伴随少量剪裂纹，而高围压下剪裂纹的生成数量明显增多，甚至峰值强度前剪裂纹的数量大于拉裂纹.试样内微裂纹的演化反映了砂岩在围压作用下的脆延性转化特性；砂岩出现明显的扩容现象，围压越大，扩容滞后越明显，且相应的扩容点应力占强度百分比增大.

关键词: Voronoi晶粒, 3DEC, 非均质性, 三轴压缩, 细观尺度

Abstract: A three-dimensional Voronoi polycrystalline discrete element model comprising an assemblage of Voronoi polycrystal generated by open source software package Neper was built using a distinct element code(3DEC)， which considered mineral grain composition. The mechanical input parameters of sandstone at a mesoscale were calibrated based on the conventional triaxial compressive testing data in laboratory， and the mesoscopic damage evolution of sandstone under triaxial compression was investigated. The results showed that the microcracks under low confining pressure are mainly tensile cracks， accompanied by a small number of shear cracks， while the number of shear cracks under high confining pressure increases significantly， and even is larger than that of tensile cracks before peak strength. The evolution of the microcrack in the sample reflects the transition of the sandstone from brittle to ductile under confining pressure. The sandstone appears obvious dilatancy phenomenon. The larger the confining pressure， the more obvious the dilatancy lags. With the increase of confining pressure， the ratio of the stress corresponding to the dilatancy point to the peak strength increases.

Key words: Voronoi polycrystal, 3DEC, heterogeneity, triaxial compression, mesoscopic scale

中图分类号:

TU457

付腾飞，徐涛，朱万成，王兴伟. 基于多晶离散元法的砂岩三轴压缩损伤特性[J]. 东北大学学报:自然科学版, 2020, 41(7): 968-974.

FU Teng-fei， XU Tao， ZHU Wan-cheng， WANG Xing-wei. Damage Characteristics of Sandstone Under Triaxial Compression Based on Polycrystalline Discrete Element Method[J]. Journal of Northeastern University Natural Science, 2020, 41(7): 968-974.

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基于多晶离散元法的砂岩三轴压缩损伤特性

Damage Characteristics of Sandstone Under Triaxial Compression Based on Polycrystalline Discrete Element Method

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