六边薄壁构件径向压缩下的吸能防冲特性分析

发布时间：2018-01-12 20:10

本文关键词：六边薄壁构件径向压缩下的吸能防冲特性分析　出处：《煤炭科学技术》2016年11期 　论文类型：期刊论文

【摘要】：为增强巷道超前液压支架抵抗冲击能力,有效支护巷道,防止煤矿冲击地压灾害发生,设计一种六边薄壁吸能防冲构件安装在支架顶梁上方来提高支架抵抗冲击能力。对构件的吸能防冲特性进行数值模拟计算,结果表明:径向压缩下六边薄壁吸能防冲构件具有非常稳定的变形破坏模式、较为恒定的反作用力和较高的冲程效率,构件尺寸、材料对冲程效率和载荷波动系数影响较小;构件通过塑性变形吸收能量;在有效变形让位行程内,吸收能量随压缩距离增加而线性增加。构件压溃载荷峰值、平均压溃载荷和总吸能均随壁厚增加,有类似于二次函数的增大趋势;构件压溃载荷峰值、平均压溃载荷、总吸能均随长度和材料屈服强度增加而线性增大;构件压溃载荷峰值和平均压溃载荷随内边长增加而减小;研究结果可为构件尺寸和材料选取提供依据。
[Abstract]:In order to strengthen the ability of roadway leading hydraulic support to resist the impact, effectively support the roadway, prevent coal mine from rock burst disaster. A six-sided thin-walled energy-absorbing and anti-punching member was designed to improve the anti-shock ability of the support by installing it above the top beam of the support. The numerical simulation of the energy absorption and anti-impact characteristics of the member was carried out. The results show that the six-sided thin-walled energy-absorbing anti-impact member under radial compression has a very stable deformation and failure mode, more constant reaction force, higher stroke efficiency and member size. The material has little effect on stroke efficiency and load fluctuation coefficient. The component absorbs energy through plastic deformation; The absorption energy increases linearly with the increase of compression distance within the effective displacement travel. The peak value of collapse load, the average crushing load and the total energy absorption increase with the increase of wall thickness, which is similar to the increase of quadratic function. The peak buckling load, average crushing load and total energy absorption increase linearly with the increase of the length and the yield strength of the material. The peak value and average crushing load decrease with the increase of inner side length. The results can provide basis for the selection of component size and material.
【作者单位】：辽宁工程技术大学矿山安全技术装备研究院;辽宁工程技术大学力学与工程学院;
【基金】：辽宁省教育厅科技研究资助项目(L2015218) 辽宁工程技术大学生产技术问题基金资助项目(20160027T)
【分类号】：TD324
【正文快照】： 0引言冲击地压是煤矿开采中遇到的重大灾害之一[1-3],近年来研究发现,大多数冲击地压发生在巷道中。然而,目前巷道支护大多没有从防冲角度进行设计,抗冲击载荷能力有限,不能满足冲击地压矿井支护要求。冲击地压对支架的冲击是影响煤层开采安全的关键问题之一[4-5]。突发冲击地

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