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矿用超前液压支架吸能构件仿真及实验研究

Simulation and experimental study on energy absorption components of advanced hydraulic support for mining

  • 摘要: 为了提高液压支架的能量吸收性能以解决巷道冲击地压发生时支架立柱爆缸等问题,提出了将一种方管与圆管互相嵌套的多胞管吸能构件与立柱串联应用于液压支架中。基于简化的超折叠单元理论剖析了多胞管的能量耗散途径,推导出了不同截面形状多胞管的等效轴向载荷预测公式;采用数值模拟获得了不同截面形状多胞管在轴向压溃作用下的能量吸收性能及其屈曲变形形态,发现多胞方管(SS类型)具备相对吸能优势,并通过试验验证了数值模拟的可靠性,同时将数值模拟与试验得到载荷均值与理论预测的等效轴向载荷进行对比,验证了等效轴向载荷预测公式具有较高的预测精度;依托课题组多胞方管中泡沫铝填充方式研究基础,选择具备相对吸能优势的25%填充率的填充方式,开展不同孔隙度泡沫铝填充多胞方管的轴向准静态压缩试验。结果表明:泡沫铝的填充有助于提升多胞方管抵抗变形的能力,其中71.18%孔隙度泡沫铝填充多胞方管载荷波动最小,有效变形长度和吸能量最大,能量吸收效果最好,可使吸能让位过程更加稳定;当冲击速度保持不变时,在不同冲击能量条件下,泡沫铝填充多胞方管防冲支架与未添加吸能构件的传统液压支架相比,支架部分的塑性能降低了87%左右,冲击时间延长了307%左右,让位距离增加了282%左右,通过吸能构件的屈曲变形有效减少了防冲支架的塑性变形,为支架立柱安全阀的开启提供了充足的时间。泡沫铝填充多胞方管的应用减小了支架立柱发生爆缸的危险性,提高了立柱的抗冲击性能。

     

    Abstract: In order to improve the energy absorption performance of hydraulic support and solve the problems such as cylinder explosion of support column when roadway rock burst occurs, a kind of multi-cell tube energy absorption component with square tube and round tube nested with each other is proposed and applied in series to the hydraulic support. Based on the simplified super folding element theory, the energy dissipation path of multi-cell tubes is analyzed, and the equivalent axial load prediction formula of multi-cell tubes with different section shapes is derived. The energy absorption performance and buckling deformation morphology of multi-cell tubes with different section shapes under axial crushing were obtained by numerical simulation. It was found that multi-cell square tubes (SS type) had relative energy absorption advantages, and the reliability of numerical simulation was verified by experiments. Meanwhile, the average load obtained by numerical simulation and experiment was compared with the equivalent axial load predicted by theory. It is proved that the equivalent axial load prediction formula has high prediction accuracy. Based on the research foundation of aluminum foam filling method in multi-cell square tube, the filling method with 25% filling rate with relative energy absorption advantage was selected to carry out axial quasi-static compression test of aluminum foam filling multi-cell square tube with different porosity. The results show that the aluminum foam filling can improve the deformation resistance of the multicellular square tube. Among them, the load fluctuation of the multi-cell square tube with 71.18% porosity is the smallest, the effective deformation length and energy absorption are the largest, and the energy absorption effect is the best, which can make the energy absorption and displacement process more stable. When the impact velocity remains unchanged, under different impact energy conditions, compared with the with the traditional hydraulic support without adding energy absorbing components, the plastic energy of the support part is reduced by about 87%, the impact time is extended by about 307%, and the yield distance is increased by about 282%. The plastic deformation of the support is effectively reduced through the buckling deformation of the energy absorption component. Sufficient time is provided for the opening of the support column safety valve. The application of aluminum foam filled multi-cell square tube reduces the risk of cylinder explosion of the support column and improves the impact resistance of the column.

     

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