摘要
为增强巷道超前液压支架抵抗冲击地压能力,有效支护巷道防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理论和实验研究,结果表明:六角处为圆弧形的吸能防冲构件压缩过程中具有非常稳定的变形破坏模式、恒定的反作用力和较高的冲程效率。材料参数和几何尺寸对载荷波动系数和冲程效率影响较小。构件压溃峰值载荷、平均压溃载荷和总吸能均随长度增加而增大;构件压溃峰值载荷和平均压溃载荷随内边长增加而减小,内边长对总吸能影响较小。构件吸能防冲特性的理论解与实验结果有较好的吻合,为构件选取提供了理论依据。六边薄壁吸能防冲构件也可作为高速公路防护栏或汽车防撞前梁等。
In order to enhance the capacity of roadway hydraulic forepoling to resist rockburst,and support the roadway effectively to prevent the occurrence of rockburst disasters in coal mine,a kind of hexagonal thin-walled energy absorption and anti-impact component installed above top beam is designed to improve the anti-impact abilities of support. The theoretical and experimental study is conducted to analyze the energy absorption and anti-impact characteristics of component. The results show that： In the process of compression,the energy absorption and antiimpact component with the six corners of circular arc has very stable deformation and failure mode,constant reactive force,and higher stroke efficiency. The influences of material parameters and geometric size on load fluctuation coefficient and stroke efficiency are smaller. The crushing peak load,mean crushing load,and total energy absorption increase with component length increasing. The crushing peak load and mean crushing load decrease with length of inner side increasing. The influence of inner side length on total energy absorption is smaller. The experimental results and theoretical solution of the energy absorption and anti-impact characteristics of component are in good agreement.This provides a theoretical basis for components selection. The hexagonal thin-walled energy absorption and antiimpact component can be used as highway guardrail or automotive anti-collision beam,etc.
出处
《地下空间与工程学报》
CSCD
北大核心
2018年第1期72-77,共6页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金应急管理项目(51641404)
辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金(LNTU16KF09)
国家重点研发计划(2016YFC0600901)
关键词
六边薄壁构件
准静态
吸能防冲特性
冲击地压
hexagonal thin-walled component
quasi-static
energy absorption and anti-impactcharacteristics
rockburst
