... roof bolt plate 锚杆垫板 mine roof bolt 矿顶螺栓 expansion type roof bolt 膨胀式锚杆 ...
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The bolt truss were used to reinforce a layer concrete beam in order to simulate a mine roadway support in a mine layer roof.
对锚拉支架支护层状顶板进行了模拟试验和参数优化研究；
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