为了应对煤矿巷道冲击地压下支架结构破坏严重的问题，本文提出了一种多胞圆管夹芯组合板。该组合板可与煤矿巷道金属支架结合，通过溃缩变形吸能共同抵御冲击荷载。共设计了4个不同芯层厚度夹芯组合板试件的落锤冲击试验，并建立了有限元模型，基于试验验证了该数值模型，开展了多胞圆管夹芯组合板的冲击响应和吸能特性的参数分析。研究结果表明，冲击作用下，多胞圆管夹芯组合板面板呈现圆盘状凹陷，芯层胞体和十字肋发生了褶皱和下陷变形，各个腔室协同工作、相互支撑，并通过塑性变形吸能。同时底部冲击反力的峰值总是滞后且低于落锤冲击荷载峰值，在多次冲击条件下，该组合板也能展现出良好的吸能缓冲效果。多胞圆管夹芯组合板可吸收超过90%的冲击能量，其中65%以上能量由芯层结构吸收。芯层厚度从0.5 mm增加到2.0 mm，芯层部分吸收能量的占比增大了24.17%，相反面板吸能效率递减，减幅为17.17%，芯层厚度减小可降低峰值冲击荷载，芯层厚度为1.0 mm时吸能效果较好。面板厚度对吸能性能影响较小，建议其厚度选择与芯层厚度相近。冲击能量一定情况下，改变落锤重量和冲击速度对结构动力冲击性能和吸能效率的影响很小。
Abstract
To address severe structural damage to support systems under rock bursts in coal mine roadways, this paper proposes a multi-cell circular steel tube sandwich panel. The panel, when combined with metal support structures in coal mine roadways, resists rock bursts through joint collapse deformation and energy absorption. Four sandwich panel specimens with different core thicknesses were designed for drop hammer impact test. Finite element models were established and validated based on experimental data, enabling a parametric analysis of the impact response and energy absorption characteristics of the multi-cell circular steel tube sandwich panels. The study reveals that under impact the multi-cell circular steel tube sandwich panel exhibits a disc-shaped depression, and the core cell and cross ribs undergo wrinkling and sinking deformation. Each chamber works collaboratively, supports each other, and absorbs energy through plastic deformation. At the same time, the peak of the bottom total impact reaction always lags and is lower than the peak impact load of the drop hammer. Under multiple impact conditions, the panel also demonstrates good energy absorption and cushioning effects. The multi-cell circular steel tube sandwich panel can absorb over 90% of the impact energy with over 65% of the energy absorbed by the core Increasing the core thickness from 0.5 mm to 2.0 mm increases the proportion of energy absorbed by the core by 24.17%. Conversely, the panel's energy absorption efficiency decreases by 17.17%, and reducing the core thickness can lower the peak impact load. A core thickness of 1.0 mm shows better energy absorption efficiency. The facesheet thickness has a minor impact on energy absorption performance. It is recommended to choose a thickness close to that of the core. Changing the drop hammer weight and impact velocity has little effect on the structural dynamic impact performance and energy absorption efficiency under a certain impact energy.
关键词
落锤冲击试验 /
多胞圆管夹芯组合板 /
冲击地压 /
煤矿巷道 /
数值模拟
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