Scholarlink

<p>This paper addresses the need for rock breaking using pneumatic down-the-hole hammer spherical tooth reaming drilling, determining the parameter selection method for the rock material model (HJC). The feasibility of this method was verified by the Split Hopkinson Pressure Bar (SHPB) test, using an added toothed cap. Further numerical simulations of single-tooth impact rock breaking were conducted to study the influence of different impact energies and drilling pressures on the rock-breaking process. The results indicate that the dynamic mechanical properties of the three types of sandstone exhibit strain rate enhancement effects, with peak stress and strain increasing linearly with the strain rate. The established numerical model and the HJC model parameter selection method were validated by the SHPB test, demonstrating good feasibility. The experimental and simulation waveforms were similar and the energy dissipation patterns were consistent, indicating that the HJC parameter selection method is effective. The numerical simulation results of single-tooth impact indicate that as the impact energy increases, the rock-breaking volume gradually increases. When the impact energy is less than 35&#xa0;J, the rock cannot be effectively broken. At 40&#xa0;J, the rock-breaking specific energy is minimized, making it the most suitable for studying single-tooth impact energy. Within the single-tooth drilling pressure range of 0 to 0.4&#xa0;kN, the rock-breaking volume and peak load are similar under different drilling pressures, but increased drilling pressure advances the peak reaction force time. The vertical reaction force rapidly increases and reaches its peak under different drilling pressures; the greater the drilling pressure, the higher the peak reaction force. As the drilling pressure continues to increase, the rock fracture time is gradually advanced, rock-breaking efficiency improves, but the total rock-breaking volume remains unchanged, indicating that drilling pressure has a minimal effect on rock breaking. The results of this study provide theoretical support and experimental validation for the design and optimization of pneumatic down-the-hole hammers. </p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on Material Parameter Value Method and Numerical Simulation of Spherical Tooth Impact Rock Breaking Model

  • 期刊论文

  • 发表日期：

    2025年6月23日

查看全文
  • Yi Cao,
  • Yansen Wang,
  • Guoxuan Song,
  • Yuning Wang,
  • Zhihao Hou

摘要

This paper addresses the need for rock breaking using pneumatic down-the-hole hammer spherical tooth reaming drilling, determining the parameter selection method for the rock material model (HJC). The feasibility of this method was verified by the Split Hopkinson Pressure Bar (SHPB) test, using an added toothed cap. Further numerical simulations of single-tooth impact rock breaking were conducted to study the influence of different impact energies and drilling pressures on the rock-breaking process. The results indicate that the dynamic mechanical properties of the three types of sandstone exhibit strain rate enhancement effects, with peak stress and strain increasing linearly with the strain rate. The established numerical model and the HJC model parameter selection method were validated by the SHPB test, demonstrating good feasibility. The experimental and simulation waveforms were similar and the energy dissipation patterns were consistent, indicating that the HJC parameter selection method is effective. The numerical simulation results of single-tooth impact indicate that as the impact energy increases, the rock-breaking volume gradually increases. When the impact energy is less than 35 J, the rock cannot be effectively broken. At 40 J, the rock-breaking specific energy is minimized, making it the most suitable for studying single-tooth impact energy. Within the single-tooth drilling pressure range of 0 to 0.4 kN, the rock-breaking volume and peak load are similar under different drilling pressures, but increased drilling pressure advances the peak reaction force time. The vertical reaction force rapidly increases and reaches its peak under different drilling pressures; the greater the drilling pressure, the higher the peak reaction force. As the drilling pressure continues to increase, the rock fracture time is gradually advanced, rock-breaking efficiency improves, but the total rock-breaking volume remains unchanged, indicating that drilling pressure has a minimal effect on rock breaking. The results of this study provide theoretical support and experimental validation for the design and optimization of pneumatic down-the-hole hammers.