摘要
为有效防治煤矿冲击地压,或在一定程度上减小冲击地压事故造成的损失,提出了一种矿用六边形折痕吸能防冲构件,构件防冲体现在构件被压溃过程中吸收冲击能、压溃空间给煤岩提供了一定的能量释放空间和构件恒力变形阶段为液压阀打开提供了时间。采用ABAQUS有限元软件模拟了不同壁厚、不同凹角宽度、轴向"堆积"不同模块个数的构件的吸能特性,并与常规六边形薄壁进行了对比分析。结果表明,折痕引入能有效降低常规六边形构件的峰值载荷、载荷波动系数,提高能量吸收和增加冲程效率,验证了折痕构件的有效性。六边形折痕构件具有较高的冲程效率,模块凹角宽度及壁厚对冲程效率、吸能评价指标影响较小。载荷波动系数随壁厚增加而降低,构件的峰值载荷、平均压溃载荷及吸收能量随壁厚增加而增加。模块凹角宽度对构件的防冲性能影响较大,应选择合适的模块凹角宽度。随"堆积"模块数增加,峰值载荷降低,反力波动增大。防冲构件与现有液压支柱结合使用能提高支柱的防冲性能。
The present paper is aimed to introduce a numerical analysis of the mining hexagonal crease components and their energy absorption and anti-impact features in hoping to reduce the rock-burst impact at least to some extent to reduce the loss and damage caused by such accidents in mining activities. The proposal we have presented is a kind of theory on the mining hexagonal crease components for energy absorption and anti-impacts,which can be embodied in two aspects：（ 1） the so-called hexagonal crease components enjoy the absorptive power to affect the energy while the crushing space can provide some kind of energy to split up the space in the process of the component crushing;（ 2） the process and the stages of the constant deformation of the components contribute to the hydraulic valve opening. Therefore,in this paper,we have used a software known as the ABAQUS finite elements for simulating the energy absorption characteristics of components with different wall thicknesses,different widths of the concave angles and different＂stacking＂ module numbers. All of the above technical means have enabled us to analyze the energy absorption features of such components and the related comparison among all the hexagonal thin-walled components. The results of our analysis indicate that： the introduction of the crease theory can not only help to reduce the peak load and the load fluctuation coefficient of the regular hexagonal components effectively,but also is useful for raising the efficiency in using the absorbed and energy stroke,though all the aforementioned effects of the wall thickness and concave angular width of the module on the stroke energy and evaluation indicators of energy absorption prove to be minor. In addition,the load fluctuation coefficient tends to decrease with increase of the wall thickness of hexagonal crease components. Moreover,the peak load,the mean crushing load and the energy absorption of components all tend to increase with the increase of the wall thickness. What is more,it is necessary to point out the effect of the concave angular width of the module on the anti-impact performance of hexagonal crease components is rather serious or great. Therefore,we have to choose appropriate concave angular width of the module in accordance with the actual need. In addition,whereas the peak load tends to decrease with the increase of the＂stacking＂ module,the reactive force fluctuation may also tend to increase with the ＂stacking ＂ modules.Thus,it would be possible for us to combine the study of the antiimpact components with the existing hydraulic props so as to improve the impact resistance of props.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2015年第5期54-58,共5页
Journal of Safety and Environment
基金
国家自然科学基金项目(51204090
51374119)
辽宁省教育厅科技研究项目(L2015218)
关键词
安全工程
吸能防冲构件
冲击地压
数值分析
六边形折痕
safety engineering
energy absorption and anti-impact components
rockburst
numerical analysis
hexagonal crease
