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吕祥锋*,王玉肖,陈艳,杜泊潼,马嵘萍,李参天.管状碳钢轴压变形吸能特征试验研究[J].实验力学,2022,37(3):407~418
管状碳钢轴压变形吸能特征试验研究
Experimental research on energy absorption characteristics of tubular carbon steel axial compression deformation
投稿时间:2021-04-14  修订日期:2021-05-24
DOI:10.7520/1001-4888-21-090
中文关键词:  管状碳钢  轴压变形  吸能特征  破坏模式  试验研究
英文关键词:tubular carbon steel  axial compression deformation  energy absorption characteristics  failure mode  experimental study
基金项目:国家自然科学基金面上项目(编号:51774048);中央高校基本科研业务费资助项目(编号:FRF-TP-19-009B1)
作者单位
吕祥锋* 1.北京科技大学 土木与资源工程学院 北京 100083 2.北京科技大学 城市地下空间工程北京市重点实验室 北京 100083 
王玉肖 1.北京科技大学 土木与资源工程学院 北京 100083 2.北京科技大学 城市地下空间工程北京市重点实验室 北京 100083 
陈艳 北京国电经纬工程技术有限公司 北京 100192 
杜泊潼 北京科技大学 土木与资源工程学院 北京 100083 
马嵘萍 北京科技大学 土木与资源工程学院 北京 100083 
李参天 北京科技大学 土木与资源工程学院 北京 100083 
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中文摘要:
      地下煤炭资源开采过程中,碳钢支护构件吸收围岩释放能量是降低动力灾害的重要途径,然而,碳钢支护构件变形吸能特征规律仍不清晰。本文采用轴压荷载、光学数字散斑和声发射同步监测相结合的研究方法,探究了3种典型碳钢材质(Q235、Q460、Q690)管状轴压条件下渐进屈曲失效模式及变形吸能特征,分析了压载全过程管状碳钢散斑变形场和声发射能谱演化规律,以期揭示管状碳钢轴压变形与能量吸收之间的内在联系。研究结果表明:(1) 3种管状碳钢轴压变形过程分为三阶段:弹性阶段、塑性阶段和屈曲压密阶段。(2) Q235管状碳钢轴压变形呈横向压扩形态,破坏模式为“圆环式”失稳模式,Q460、Q690管状碳钢轴压变形呈纵向弯曲形态,破坏模式为“钻石式”失稳模式。(3) 对比分析3种管状碳钢的吸能效果,可得Q460吸能效果最佳,总吸能值达668.32J, Q235与Q690总吸能值分别为Q460的82.5%与77.84%。上述研究结果可为围岩吸能防护钢质及结构选型提供理论参考。
英文摘要:
      In the process of underground coal mining, carbon steel support members absorb the energy released by surrounding rocks, which is an important way to reduce dynamic disasters. However, the law of deformation energy absorption characteristics of carbon steel support members is still unclear. In this paper, the research method combining axial compressive load, optical digital speckle and acoustic emission synchronous monitoring is used to explore the progressive buckling failure mode and deformation energy absorption characteristics of three typical carbon steel materials (Q235, Q460, Q690) under tubular axial compression. The speckle deformation field and acoustic emission energy spectrum evolution law of tubular carbon steel in the whole process of ballasting were studied, in order to reveal the intrinsic relationship between the axial compression deformation and energy absorption of tubular carbon steel. Research indicates: (1) The uranium compression deformation process of the three tubular carbon steels is divided into three stages: elastic stage, plastic stage and buckling compaction stage. (2) The deformation of Q235 tubular carbon steel under uranium compression is in the form of lateral compression and expansion, and the failure mode is “ring type” instability mode. The axial compression of Q460 and Q690 tubular carbon steel is in the form of longitudinal bending, and the failure mode is “diamond” stable mode. (3) Comparing and analyzing the energy absorption effect of three kinds of tubular carbon steel, it can be concluded that Q460 has the best energy absorption effect. The total energy absorption value of Q235 and Q690 are 82.5% and 77.84% of that of Q460, respectively. The above research results can provide a theoretical reference for the selection of surrounding rock energy absorbing protection steel and structure.
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