冲击地压新型加肋板圆管式吸能防冲构件的仿真与试验

针对冲击地压下巷道支护设备防冲能力差,易遭受冲击性失效问题,提出一种防冲支架用加肋板圆管式吸能防冲构件,通过仿真和试验方法分析不同肋板厚度和布置形式下加肋板圆管式构件以及无肋板圆管构件的吸能防冲特性。结果表明:肋板的布置抑制了圆管构件压溃屈曲的圆环模式变形和欧拉失稳,使变形趋于稳定;随着肋板厚度增加,构件压溃变形阈值、吸能量、反力平均水平增加,反力波动增大,可用变形让位距离减小;一字形肋板布置构件变形普遍不规范,十字形构件出现开裂和偏斜变形现象,Y字形、肋板厚度较小构件变形普遍较规范,从一字形、Y字形到十字形构件,其变形阈值、吸能量、反力平均水平基本有所增加,可用变形让位距离减小;Y字形、肋板厚8 mm的构件为ZHD6000型防冲支架较理想的吸能防冲构件。

Simulation and tests for new tubular type energy-absorbing and anti-impact members with stiffened plate under rock burst

Aiming at the problem of roadway support equipment’s poor anti-impact capacity and being vulnerable to shock and failure under rock burst, anti-impact hydraulic supports using tubular type energy-absorbing and anti-impact members with stiffened plate were proposed. Through simulation and tests, energy-absorbing and anti-impact characteristics of tubular type members with stiffened plate of different thicknesses and layout forms and those without stiffened plate were analyzed. The results showed that using stiffening plate suppresses ring mode deformation and Euler instability due to tubular member’s buckling and collapse to make deformations be stable;with increase in stiffened plate thickness, member’s collapse deformation threshold value, energy absorption and mean reaction force increase, but the fluctuation of reaction force increases and the free-to-position distance of available deformation decreases;the deformation of members with "-" shaped stiffened plate is irregular generally, members with "+" shaped stiffened plate have crack and skew deformation, members with Y-shaped stiffened plate and those with stiffened plate of smaller thickness have regular deformation generally;from members with "-" shaped stiffened plate, those with Y-shaped one to those with "+" shaped one, their deformation threshold values, energy absorptions and mean reaction forces gradually increase, and their available deformation’s free-to-position distances decrease;energy-absorbing and anti-impact members with Y-shaped stiffened plate of 8 mm thickness are more ideal for ZHD6000 type anti-impact hydraulic supports.