新型矿用圆弧形薄壁防冲吸能装置屈曲特性数值分析

Numerical analysis on buckling characteristics of a new circular arc thin-wall anti-impact and energy-absorbing device for mine

为解决支架面对冲击地压产生的强冲作用容易失效、失稳的难题,针对现有矿用防冲吸能装置存在的不足,提出1种新型矿用圆弧形薄壁防冲吸能装置。采用ABAQUS有限元数值模拟方法对新型防冲吸能装置与原有方形预折纹薄壁装置进行对比分析,同时研究新型防冲吸能装置在不同壁厚和不同轴向模块堆积个数情况下的屈曲特性。结果表明:圆弧形薄壁装置相比于方形折纹薄壁装置在相同厚度情况下其总吸能提升近20%,比吸能提高63%,装置防冲优势明显;在装置高度不变的情况下增加模块轴向堆积个数可有效降低压溃峰值荷载、荷载波动系数,增加平均压溃荷载;随着装置薄壁厚度降低,压溃峰值荷载、压溃平均荷载、总吸能与比吸能均降低,荷载波动系数增加,曲线波动性变大。

In order to solve the problem that the support surface is liable to occur failure and instability under the strong impact effect of rock burst,based on the shortcomings of the existing anti-impact and energy-absorbing device used in mine,a new circular arc thin-wall anti-impact and energy-absorbing device for mine was proposed.The ABAQUS finite element numerical simulation method was used to compare and analyze the new anti-impact and energy-absorbing device with the original square pre-folded thin-wall device.Meanwhile,the buckling characteristics of the new anti-impact and energy-absorbing device under different wall thicknesses and different numbers of axial stacking modules were studied.The results showed that under the same thickness,the total energy absorption of the circular arc thin-walled device was nearly 20%higher than that of the square folded thin-wall device,and its specific energy absorption increased by 63%,so the circular arc thin-wall device had obvious anti-impact advantages.Under the same device height,increasing the number of axial stacking modules could effectively reduce the peak crushing load and load fluctuation coefficient,and increase the average crushing load.As the thin-wall thickness of the device decreased,all the peak crushing load,average crushing load,total energy absorption and specific energy absorption decreased,the load fluctuation coefficient increased,and the curve fluctuation became larger.