初始损伤煤岩承载力学特性压缩试验模拟研究
首发时间:2015-12-01
摘要:为了定量分析初始损伤煤岩的承载力学特性,借助细观颗粒流软件PFC2D的平行黏结模型建立可破碎块体(Cluster)单轴压缩模型,分析了不同初始损伤煤岩块度、结构面黏结强度对承载力学特性的影响。研究结果表明:初始损伤块度对煤岩承载能力起主导影响因素,结构面的黏结强度对损伤煤岩的力学承载能力具有一定的强化作用,但对于承载极限强度的影响,只有在损伤块度较小时比较显著;静载作用下,损伤煤岩达到极限强度时块体破坏率低于2%,破坏程度与结构面黏结强度成反比关系,与块体尺度无关。论文的研究成果为分析损伤煤岩体承载力学特性提供了新的思路和方法。
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The initial damage of coal rock bearing mechanical properties of compression test simulation
Abstract:In order to quantitative analysis the mechanical characteristics of initial damage coal rock under load,with the help of the parallel bond model of microscopic particle flow software PFC2D to establish the broken block(Clusters) uniaxial compression model,analyzed the effect of initial damage coal rock lumpiness,surface structure bonding strength to bearing mechanical properties.The results show that:the initial damage block of coal rock plays a dominant influence factors to the bearing capacity,the surface structure bonding strength could enhance the mechanical bearing capacity of damaged coal and rock,but for the significan influence of ultimate bearing strength only in small degree of damage block;Under static load,the damaged coal rock reaches the ultimate strength,blocks failure rate less than 2%.The extent of damage have an inverse relationship with the structural surface bond strength,has nothing to do with the block scale.The research results of this paper provides new ideas and methods for the analysis of bearing mechanical properties of coal and rock damage.
Keywords: damage coal rock;mechanical bearing properties;lumpiness;surface structure; bonding strength
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No.4665410452859144****
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