尚勇, 孙靖东, 姜海峰, 许顺海, 段红磊, 孙朝阳. 刃宽对硬岩掘进影响的仿真及试验研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.11.22.001
引用本文: 尚勇, 孙靖东, 姜海峰, 许顺海, 段红磊, 孙朝阳. 刃宽对硬岩掘进影响的仿真及试验研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.11.22.001
Research on the disc cutter excavation characteristics with different blade thickness based on numerical simulation and experiment[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.11.22.001
Citation: Research on the disc cutter excavation characteristics with different blade thickness based on numerical simulation and experiment[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.11.22.001

刃宽对硬岩掘进影响的仿真及试验研究

Research on the disc cutter excavation characteristics with different blade thickness based on numerical simulation and experiment

  • 摘要: 滚刀在硬岩掘进中极易发生崩刃等异常失效,研究硬岩条件下刃型参数对破岩载荷和破岩效率的影响十分重要。本文基于双线性本构模型及BK损伤断裂准则建立了岩石材料的内聚力本构模型,内聚力本构模型可以模拟岩石破碎过程裂纹的萌生与扩展,通过与单轴抗压及巴西劈裂试验对比验证了模型的可靠性和准确性。进一步采用滚刀破岩试验和数值模拟相结合的方法,从载荷曲线、破岩体积、破岩比能等方面分析了刃宽对滚刀破岩的影响。结果表明:滚刀破岩过程主要分为三个阶段:弹性阶段、裂纹萌生-扩展阶段及岩石破坏卸载阶段。滚刀破岩载荷和破岩体积随着贯入度和刃宽的增加而增加,破岩比能随刃宽的增加呈先减小后增大的趋势。对于所选取的硬岩,采用13 mm刃宽滚刀破岩时比能最小,破岩效率最高;7 mm刃宽滚刀破岩时无法形成贯通岩片,相邻滚刀之间仍存在岩脊,破岩效率较低。

     

    Abstract: During excavation in hard rock, the disc cutters usually occurred abnormal failure. It is very important to research the influence of cutter geometric parameters on excavation efficiency and cutter load. Based on the Cohesive element, this article established a rock model which used the Cohesive constituted model. The Cohesive constituted model contains double linear constituted evolution and BK damage failure criterion. Compared to the uniaxial compressive strength and Brazilian splitting test, the accuracy and reliability of the Cohesive constituted model had been verified. The linear cutting test and the simulation model of disc cutter excavation was used to research the disc cutter load with different blade thickness, and the effect of blade thickness on rock breaking was comprehensively analyzed in terms of the load curve, volume of rock breaking, and specific energy, etc. The research indicated that there are three main stages of the disc cutter excavation process: the elastic stage, the crack initiation-propagation stage and the rock unloading stage, and the crack initiation-propagation stage determines the rock breaking efficiency. The result indicated that the disc cutter load and rock break volume increases with the increase of penetration and blade thickness, and the specific energy shows a trend of decreasing and then increasing with the blade thickness increase. The specific energy of the disc cutter with a width of 13 mm is the smallest, which means the highest rock breaking efficiency, the disc cutter with 7 mm blade thickness cannot form a through rock fragmentation, the breaking efficiency is lowest.

     

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