长江科学院院报 ›› 2016, Vol. 33 ›› Issue (7): 68-75.DOI: 10.11988/ckyyb.20150451

• 岩土工程 • 上一篇    下一篇

层理面细观参数对层状岩体强度特性影响的研究

夏磊, 曾亚武, 张森   

  1. 武汉大学 土木建筑工程学院,武汉 430072
  • 收稿日期:2015-05-29 出版日期:2016-07-01 发布日期:2016-07-11
  • 通讯作者: 曾亚武(1964-),男,湖北安陆人,教授,博士,主要从事地下建筑工程与岩石力学的教学与科研工作,(电话)13808653023(电子信箱)zengyw@whu.edu.cn。
  • 作者简介:夏 磊(1990-),男,湖北荆州人,博士研究生,主要从事岩石力学与工程等方面的研究工作,(电话)18207162456(电子信箱)xialei2009@whu.edu.cn。
  • 基金资助:
    国家自然科学基金项目(41272342)

Influence of Meso-mechanical Parameters of Bedding Plane on Strength Characteristics of Layered Rock Mass

XIA Lei, ZENG Ya-wu, ZHANG Sen   

  1. School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China
  • Received:2015-05-29 Online:2016-07-01 Published:2016-07-11

摘要: 为了从细观角度研究不同层理面的细观参数对层状岩体强度特性的影响,利用颗粒流建立数值模型,从细观角度将层理面力学参数分为黏结强度、摩擦作用和咬合作用3个方面,通过开展不同层理倾角下层状岩体单轴压缩试验的数值模拟,初步探讨了层理面力学参数对层状岩体强度的影响。结果表明:当层理黏结强度与基岩相差很大时,其影响可以忽略,而当其与基岩黏结强度比较相近时,其影响很大;层理摩擦作用对岩体整体强度的影响很小;层理咬合作用由层理厚度体现,是影响岩样整体宏观强度的重要因素,在试验颗粒级配条件下,当层理厚度取大约3倍最小颗粒半径时比较合理。

关键词: 层状岩体, 颗粒流, 层理面, 破坏模式, 细观力学参数

Abstract: The influence of meso-mechanical parameters at bedding plane on the strength characteristics of layered rock mass was studied by using particle flow method. Mechanical parameters of the bedding plane were divided into three aspects at meso-scale:bond strength, friction action and interlocking. The impact of bedding mechanical parameters on the overall strength of the rock mass was preliminarily analyzed, in association with uniaxial compression tests under different bedding inclinations by numerical simulation. The results showed that: (1)when the difference between bedding bond strength and bedrock strength is big enough, the impact can be negligible, but smaller the difference is , bigger the impact is; (2) the friction of the bedding structure has little effect on the overall strength of rock mass; (3) bedding thickness reflects the interlocking, and it was an important influencing factor for global macroscopic strength of rock specimen;(4)under particle distribution in the experiment, it is rational when bedding thickness is about three times as much as the smallest particle radius.

Key words: layered rock mass, particle flow method, bedding plane, failure mode, meso-mechanical parameter

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