废旧矿用U型钢改形锚索托盘变形破坏机理及控制对策
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摘要
针对矿用U型钢改形锚索托盘受力过程中发生大的弯曲变形和孔口撕裂,导致锚索支护系统失效的现象,推导了U型钢改形锚索托盘弯曲变形破坏方程,模拟分析了均布荷载作用下改形托盘的力学特征,发现改形托盘4个角发生弯曲变形量最大,纵向路径弯曲变形明显大于横向,孔口易发生撕裂破坏。通过数值模拟与公式推导得出,两者计算结果的差值较小,进而提出了减小改形托盘发生弯曲变形和避免孔口发生撕裂的控制对策。在井下进行现场试验,取得了较好的效果。
Aiming at the phenomenon of failure in anchor wire supporting system caused by large bending deformation and orifice tear happening in the loading process of modified anchor wire pallet with mine-used U-shaped steel,the equation of bending deformation failure for modified anchor wire pallet with mine-used U-shaped steel was deduced. The mechanical characteristics of modified pallet under the effect of uniform load were simulated and analyzed. It showed that the bending deformation was the largest on the four corners of modified pallet,the bending deformation on the longitudinal path was significantly larger than that on the lateral path,and the tear failure was easy to occur on the orifice. Through comparison and analysis on numerical simulation and formula derivation,the difference between two calculation results was smaller. The countermeasures to reduce the bending deformation of modified pallet and avoid the orifice tear were put forward,and the better effect was achieved through underground field experiments.
Aiming at the phenomenon of failure in anchor wire supporting system caused by large bending deformation and orifice tear happening in the loading process of modified anchor wire pallet with mine-used U-shaped steel,the equation of bending deformation failure for modified anchor wire pallet with mine-used U-shaped steel was deduced. The mechanical characteristics of modified pallet under the effect of uniform load were simulated and analyzed. It showed that the bending deformation was the largest on the four corners of modified pallet,the bending deformation on the longitudinal path was significantly larger than that on the lateral path,and the tear failure was easy to occur on the orifice. Through comparison and analysis on numerical simulation and formula derivation,the difference between two calculation results was smaller. The countermeasures to reduce the bending deformation of modified pallet and avoid the orifice tear were put forward,and the better effect was achieved through underground field experiments.
引文
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[10]谢孟,黄家鸣.变截面悬臂梁的挠度计算[J].四川建筑科学研究,1992(2):31-33MENG Xie,HUANG Jia-ming.Deflection calculation of variable cross-section cantilever beam[J].Building Science Research of Sichuan,1992(2):31-33
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[2]张军,杨仁树,段绪华.深部软岩巷道变形机理及卸荷本构关系研究[J].中国安全生产科学技术,2011,7(12):32-37ZHANG Jun,YANG Ren-shu,DUAN Xu-hua.Research on deformation mechanism and unloading constitutive relation of deep rock roadway[J].Journal of Safety Science and Technology,2011,7(12):32-37
[3]李冲,徐金海,李明.全长锚固预应力锚杆杆体受力特征分析[J].采矿与安全工程学报,2013,30(2):188-193LI Chong,XU Jin-hai,LI Ming.The mechanical characteristics analysis of fully anchored pre-stressed bolts in coal mines[J].Journal of Mining&Safety Engineering,2013,30(2):188-193
[4]姚琦,冯涛,王卫军,等.极破碎围岩半煤岩巷变形破坏机理及支护控制研究[J].中国安全生产科学技术,2015,11(5):32-39YAO Qi,FENG Tao,WANG Wei-jun,et al.Study on deformation and failure mechanism and support control measure of half coal rock roadway under extremely fractured surrounding rock[J].Journal of Safety Science and Technology 2013,30(2):188-193
[5]康红普,林健,吴拥政.全断面高预应力强力锚索支护技术及其在动压巷道中的应用[J].煤炭学报,2009(9):1153-1159KANG Hong-pu,LIN Jian,WU Yong-zheng.High pretensioned stress and intensive cable bolting technology set in full section and application in entry affected by dynam ic pressure[J].Journal of China Coal Society,2009(9):1153-1159
[6]冯京波.松散厚煤层全煤巷沿空掘巷锚索支护技术[J].煤炭科学技术,2008,36(2):23-26FENG Jing-bo.Bolt and anchor combined support techno logy for full seam gateway driving a long next goaf in soft thick seam[J].Coal Science and Technology,2008,36(2):23-26
[7]王金华,康红普,高富强.锚索支护传力机制与应力分布的数值模拟[J].煤炭学报,2008,33(1):1-6WANG Jin-hua,KANG Hong-pu,GAO Fu-qiang.Numerical simulation study on load-transfer mechanisms and stress distribution characteristics of cable bolts[J].Journal of China Coal Society,2008,33(1):1-6
[8]薛亚东,黄宏伟.水对树脂锚索锚固性能影响的试验研究[J].岩土力学,2005(增1):31-34XUE Ya-dong,HUANG Hong-wei.Experimental study on effect of water on anchoring performance of resin cable bolts[J].Rock and Soil Mechanics,2005(S1):31-34
[9]韩建胜,王阁,连传杰.高水平应力条件下锚杆锚索耦合让压支护技术试验研究[J].煤炭技术,2009(12):162-164HAN Jan-sheng,WANG Ge,LIAN Chuan-jie.xperimental study of bolt and anchorage cable.s coupling yieldable support technology under high horizontal stress[J].Coal Technology,2009(12):162-164
[10]谢孟,黄家鸣.变截面悬臂梁的挠度计算[J].四川建筑科学研究,1992(2):31-33MENG Xie,HUANG Jia-ming.Deflection calculation of variable cross-section cantilever beam[J].Building Science Research of Sichuan,1992(2):31-33
[11]徐芝纶.弹性力学简明教程[M].北京:高等教育出版社,2010
[12]孙训方,方孝淑,等.材料力学[M].北京:高等教育出版社,2009
[13]李大磊,赵玉奇,等.Solidworks高级功能与工程应用[M].北京:北京邮电大学出版社,2009
[14]费康,张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010