岩土力学 ›› 2023, Vol. 44 ›› Issue (12): 3602-3616.doi: 10.16285/j.rsm.2023.0448

• 数值分析 • 上一篇    下一篇

基于离散元法模拟的冻融砂岩细观破裂演化特征研究

宋勇军1,孙银伟1,李晨婧1,杨慧敏1,张磊涛2,谢丽君3   

  1. 1. 西安科技大学 建筑与土木工程学院,陕西 西安 710054;2. 大连理工大学 土木工程学院,辽宁 大连 116024; 3. 中冶地集团西北岩土工程有限公司,陕西 西安 710061
  • 收稿日期:2023-04-11 接受日期:2023-05-23 出版日期:2023-12-20 发布日期:2023-12-21
  • 通讯作者: 孙银伟,男,1999年生,硕士研究生,主要从事岩石力学方面的研究工作。E-mail: sunyinwei2021@163.com E-mail:songyj79@xust.edu.cn
  • 作者简介:宋勇军,男,1979年生,博士,教授,博士生导师,主要从事岩石力学与地下工程方面的教学与研究工作。
  • 基金资助:
    国家自然科学基金(No.42277182,No.11972283)。

Meso-fracture evolution characteristics of freeze-thawed sandstone based on discrete element method simulation

SONG Yong-jun1, SUN Yin-wei1, LI Chen-jing1, YANG Hui-min1, ZHANG Lei-tao2, XIE Li-jun3   

  1. 1. College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China; 2. School of Civil Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China; 3. China Metallurgical Group Northwest Geotechnical Engineering Co., Ltd., Xi’an, Shaanxi 710061, China
  • Received:2023-04-11 Accepted:2023-05-23 Online:2023-12-20 Published:2023-12-21
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (42277182, 11972283).

摘要:

为探究冻融岩石细观损伤累积及受载破裂过程,基于离散元提出一种水冰颗粒相变耦合膨胀方法,借助颗粒流程序实现岩石冻融过程模拟,结合室内试验验证模拟结果的可靠性,定量表征孔隙水颗粒冻胀评价指标λv,建立λv与冻融循环次数N之间的函数关系,并对冻融岩石受载过程中微裂纹−位移场−力链场演化及破裂特征进行评估。结果表明:(1)冻融循环作用下岩石内部孔隙水体积膨胀及持续补水是造成其损伤的本质原因;冻融过程中试样细观微裂纹由拉伸裂纹主导,呈“先慢后快”趋势演化,且外围岩石颗粒位移较内部更显著。(2)试样受载时微裂纹呈“慢→缓→陡”发展,冻融循环次数与受载产生的微裂纹数量呈正相关,但与微裂纹起裂应力σi却呈负相关。(3)冻融前后试样破裂过程与形态明显不一,受载趋于峰值强度σ时,试样微裂纹分布−位移场−力链场有“异常信号”出现,可作为破坏前兆识别信息;冻融循环影响下,试样内部微裂纹空间排布方式更为复杂,由拉伸微裂纹主导破裂向拉−剪混合微裂纹主导转变。该研究可为探索冻融岩石破坏行为提供一种新的思路和方法。

关键词: 离散元, 冻融循环, 颗粒流, 细观损伤, 单轴压缩, 破裂演化

Abstract:

To investigate the mesoscopic damage accumulation and the loading-induced fracture process in freeze-thawed rocks, a method coupling water-ice particle phase transition and expansion based on the discrete element method is proposed. The rock freeze-thaw process is simulated using a particle flow program, and the reliability of the simulation results is verified through laboratory experiments. The frost heave evaluation index λof pore water particles is quantitatively characterized, and a functional relationship between λv and the number of freeze-thaw cycles N is established. Furthermore, the fracture characteristics and the evolution of microcrack, displacement field and force chain field in freeze-thawed rocks during the loading process are evaluated. The results show that: (1) The volumetric expansion of pore water in the rock and continuous water replenishment are the essential causes of rock damage under freeze-thaw treatments. Microcracks in the samples are dominated by tensile cracks during the freeze-thaw process, exhibiting an “initially slow, then fast” evolutionary trend, with more significant displacement of rock particles on the periphery than those in the interior. (2) The number of microcracks in the samples under loading exhibits a “slow→gradual→rapid” growth trend. The numbers of freeze-thaw cycles positively correlated with the number of microcracks but negatively correlated with the microcrack initiation stress σ. (3) The fracture process and morphology of the samples differ significantly before and after freeze-thaw treatment. When the load approaches the peak stress σ, there are “abnormal signals” in the microcrack distribution, displacement field and force chain field, which can serve as a precursor to failure identification. Under the influence of freeze-thaw cycles, the spatial arrangement of microcracks inside the samples becomes more complex, and the fracture mode transitions from dominance by tensile microcracks to dominance by mixed tensile-shear microcracks. This study provides a new idea and method for exploring the failure behavior of freeze-thawed rocks.

Key words: discrete element method, freeze-thaw cycles, particle flow, mesoscopic damage, uniaxial compression, fracture evolution

中图分类号: TU454
[1] 郅彬, 魏园钧, 王番, 张茜, 刘存利, 任会明, . 冻融循环作用下含Na2SO4盐原状黄土宏观强度与微观结构关联机制研究[J]. 岩土力学, 2025, 46(S1): 106-120.
[2] 宋义敏, 王腾腾, 许海亮, 安栋, 蒋孝东. 岩石变形局部化和破裂前兆的应变信息识别研究[J]. 岩土力学, 2025, 46(S1): 171-182.
[3] 喻昭晟, 陈晓斌, 周雨晴, 吕鑫龙, . 红层软岩崩解面释放率与崩解特性研究[J]. 岩土力学, 2025, 46(S1): 285-296.
[4] 孙志亮, 邵敏, 王叶晨梓, 刘忠, 任伟中, 柏巍, 李朋, . 管道破损诱发地面沉降细观模拟与影响因素分析[J]. 岩土力学, 2025, 46(S1): 507-518.
[5] 苗日成, 唐贝, 祁飞, 江志安, 崔溦, . 随机裂隙岩体滚刀破岩过程离散元模拟研究[J]. 岩土力学, 2025, 46(S1): 541-552.
[6] 蔡玉娟, 蔡静森, 任少文, 刘锴, 陈劲, 李漪, . 岩溶区非均质岩组岩体力学参数快速估计方法研究[J]. 岩土力学, 2025, 46(9): 2749-2762.
[7] 屈俊童, 时启壮, 郭颖杰, 张 翔, 刘 熠, 蒋德阳. 冻融循环作用下冰碛土力学特性及损伤机制研究[J]. 岩土力学, 2025, 46(9): 2859-2872.
[8] 李新明, 何永飞, 谈云志, 任克彬, 张先伟, 尹松, . 不同含水率下石灰−偏高岭土改良遗址土宏微观特性的冻融循环效应[J]. 岩土力学, 2025, 46(9): 2894-2906.
[9] 孙闯, 蒲云波, 敖云鹤, 陶琦, . 冻融饱水裂隙砂岩力学特性及细观破裂演化特征研究[J]. 岩土力学, 2025, 46(8): 2339-2352.
[10] 劳国峰, 阳军生, 谢亦朋, 汤冲, 许志鹏, . 基于骨架结构指标的连续级配颗粒土峰值抗剪强度模型研究[J]. 岩土力学, 2025, 46(8): 2459-2470.
[11] 刘文林, 鄂天龙, 冯杨州, 牛松荧, 张子堂, 孙熠, 陈宏信, . 纳米改性地聚合物隔离墙材料基本工程特性及冻融循环耐久性研究[J]. 岩土力学, 2025, 46(7): 2039-2048.
[12] 彭潇, 周剑, 张路青, 杨志法, 周唐富, 林雅苗, 杨多兴, . 实时高温和自然冷却条件下石英岩热损伤特征对比模拟研究[J]. 岩土力学, 2025, 46(6): 1943-1956.
[13] 姜海波, 卢燕, 李琳, 张军, . 干湿-冻融作用输水渠道膨胀土强度特性及损伤演化规律研究[J]. 岩土力学, 2025, 46(5): 1356-1367.
[14] 高品红, 高晨博, 彭成威, 刘飞禹, . 降雨作用下花岗岩残积土边坡模型试验及离散元分析[J]. 岩土力学, 2025, 46(5): 1632-1642.
[15] 杨艳霜, 闫磊, 张占荣, 刘永莉, 崔臻, 彭剑承, 亢兆鹏, . 基于三相孔隙介质模型的地震动传播特性研究[J]. 岩土力学, 2025, 46(4): 1109-1121.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!