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。
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.
关键词
层状岩体 /
颗粒流 /
层理面 /
破坏模式 /
细观力学参数
Key words
layered rock mass /
particle flow method /
bedding plane /
failure mode /
meso-mechanical parameter
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