东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (2): 282-286.DOI: 10.12068/j.issn.1005-3026.2020.02.023

• 资源与土木工程 • 上一篇    下一篇

循环荷载下含双裂隙砂岩弹性模量的演化规律

王述红, 王子和, 王凯毅, 庄贤鹏   

  1. (东北大学 资源与土木工程学院, 辽宁 沈阳110819)
  • 收稿日期:2019-03-06 修回日期:2019-03-06 出版日期:2020-02-15 发布日期:2020-03-06
  • 通讯作者: 王述红
  • 作者简介:王述红(1969-),男,江苏泰州人,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(51474050,U1602232); 中央高校基本科研业务费专项资金资助项目(N170108029); 辽宁省自然科学基金资助项目(20170540304,20170520341); 中建股份科技研发课题(CSCEC-2016-Z-20-8); 辽宁省科学技术计划重大项目(2019JH2/10100035); 国家级大学生创新创业训练计划项目(201810145043).

Evolution Law of Elastic Modulus of Sandstone with Double Fissures Under Cyclic Loading

WANG Shu-hong, WANG Zi-he, WANG Kai-yi, ZHUANG Xian-peng   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2019-03-06 Revised:2019-03-06 Online:2020-02-15 Published:2020-03-06
  • Contact: WANG Shu-hong
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摘要: 以含预制裂隙砂岩单轴循环加卸载试验结果为基础,探究裂隙几何参数对试样弹性模量的影响规律;结合PFC2D颗粒流程序,对试样裂纹发育状态与弹性模量演化规律的关系进行深入分析.研究结果表明:随着循环周数增加,多数试样的弹性模量呈现出强化现象,且第一次加卸载循环对弹性模量的强化作用最为显著,这与试件内部细观结构的调整有关;然而少数试样的弹性模量则呈现出弱化现象,结合PFC2D颗粒流程序得出,弱化现象与裂纹发育状态密切相关.

关键词: 循环荷载, 预制裂隙, 弹性模量, 颗粒流模拟

Abstract: According to the uniaxial cyclic loading and unloading test results of sandstone with precast fissures, the effects of fracture geometric parameters on elastic modulus of specimens were investigated. Using PFC2D code, the relationship between crack development status and elastic modulus of specimens was analyzed. The research results show that: with the increase of cycle numbers, the elastic modulus of most specimens shows a strengthening phenomenon, and the first loading/unloading cycle has the most significant strengthening effect on the elastic modulus, which is related to the internal meso-structure; while the elastic modulus of a few specimens shows a weakening phenomenon; and combining with the PFC2D code simulation, the weakening phenomenon is closely related to the crack development status.

Key words: objective, interval particle, intervalcyclic loading, precast fissures, elastic modulus, particle flow code

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