摘要
当煤矿井下发生冲击地压时,矿用液压支架的冲击性失效,常常会引起巷道支护系统的破坏,进而引发巷道坍塌,造成矿难。当前通过添加吸能构件来提高支架的防冲击性能是防治巷道冲击地压的有效途径之一。而不同类型吸能构件的压溃变形模式不同,表现出的吸能特性和力学特性也不同。本文采用数值方法对不同类型、支座和壁厚的吸能构件进行了冲击压溃模拟,通过对各相关防冲吸能参数的对比分析可知:预折纹吸能构件支撑反力最大、具有良好的吸能能力,但变形过程稳定性较差;外翻式吸能构件的塑性变形能力强,有效让位行程最大,但支撑力较小,不适合单独使用;扩径式吸能构件变形过程稳定性最好,其塑性变形后的径向位移较小,节省工作空间,但支撑能力较差,适用于小型液压支架或用作其他特殊用途。
When rock burst occurs in underground coal mine,the impact failure of mine hydraulic support often causes the destruction of roadway support system,which leads to roadway collapse and causes mine accidents.At present,it is one of the effective ways to prevent roadway rock burst by adding energy-absorbing components to improve the anti-shock support performance of support.However,different types of energy-absorbing components have different deformation patterns of crushing and exhibit different energy-absorbing and mechanical properties.In this paper,the numerical method is used to simulate the impact crushing of energy-absorbing components with different types,supports and wall thicknesses,and the relevant anti-impact energy-absorption parameters are analyzed.The comparative analysis of three different types of energy-absorbing components shows that:the pre-folded energy-absorbing components has the largest support reaction force and good energyabsorbing capacity,but the stability of the deformation process is poor;the outward-folded energy-absorbing components has strong plastic deformation capacity and the largest effective yielding stroke,but the support force is small and not suitable for individual use;the expanded energy-absorbing components has the best stability of the deformation process and its radial displacement after plastic deformation is small,saving Work space,but the support capacity is poor,suitable for small hydraulic support or used for other special purposes.
作者
郭涛
吴文禄
黎振华
马鸿泽
虎雪洁
Guo Tao;Wu Wenlu;Li Zhenhua;Ma Hongze;Hu Xuejie(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650093,P.R.China;Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2024年第1期276-286,共11页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51961017)。
关键词
吸能构件
冲击地压
吸能特性
防冲液压支架
energy-absorbing components
rock-burst
energy-absorption characteristics
anti-impact hydraulic support
