锚固体梁的弯曲突变失稳问题分析
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摘要
现场经验及模型实验表明,煤巷锚杆支护中有时出现锚固体的弯曲突变失稳现象。通过力学模型解析,系统地研究了锚固体的弯曲突变失稳机理及平衡条件,并对锚固体的横向承载面积及水平推力进行了分析,发现锚固体梁在受载变形的不同阶段维持不同的自稳特征,保持不同的动态平衡。因此,研究锚固体突变失稳的发生和控制具有理论价值和工程意义。
Field experience and similar material simulation indicate that there is the bending catastrophe phenomenon of anchor roof beam in bolting roadway sometimes. By means of mechanical model analysis, bending catastrophe steady mechanism and equilibrium conditions of anchor roof beam are systematically studied; and the bearing area and horizontal thrust of the anchor roof beam are analyzed, too. It is discovered that anchor roof beam different steady characteristics and different dynamic equilibriums in different stages. The theoretical and engineering value of them are prospected for the presentation and controlling of anchor roof beams.
Field experience and similar material simulation indicate that there is the bending catastrophe phenomenon of anchor roof beam in bolting roadway sometimes. By means of mechanical model analysis, bending catastrophe steady mechanism and equilibrium conditions of anchor roof beam are systematically studied; and the bearing area and horizontal thrust of the anchor roof beam are analyzed, too. It is discovered that anchor roof beam different steady characteristics and different dynamic equilibriums in different stages. The theoretical and engineering value of them are prospected for the presentation and controlling of anchor roof beams.
引文
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[5]朱维申,张玉军,任伟中.系统锚杆对三峡船闸高边坡岩体加固作用的块体相似材料模型试验研究[J].岩土力学,1996,17(2):1-6.ZHU Wei-shen,ZHANG Yu-juen,REN Wei-zhong.Similar models block tests for reinforcing effects of systematic bolts on rock mass of high slope ofThreeGorges flight lock[J].Rock andSoilMechanics,1996,17(2):1-6.
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[7]高明中.煤巷锚杆支护对动压适应性的研究[J].淮南工业学院学报,1999,19(1):35-39.GAO Ming-zhong.Study on the suitability of bolting in coal gateways with the action of dynamic pressure[J].Journal ofHuainanInstitute ofTechnology,1999,19(1):35-39.
[2]黄醒春.长壁工作面老顶初次来压的弯曲失稳解析[J].煤炭学报,1998,23(1):27-32.HUANG Xing-chun.Analysis on bending failure of initial weighing of main roof in longwall face[J].Journal ofChinaCoalSociety,1998,23(1):27-32.
[3]黄醒春.不连续岩石梁的失稳分析[J].计算力学学报,1997,14(4):468-476.
[4]于广明.地层沉陷中的突变现象及其研究进展[J].辽宁工程技术大学学报,2001,20(1):1-5.
[5]朱维申,张玉军,任伟中.系统锚杆对三峡船闸高边坡岩体加固作用的块体相似材料模型试验研究[J].岩土力学,1996,17(2):1-6.ZHU Wei-shen,ZHANG Yu-juen,REN Wei-zhong.Similar models block tests for reinforcing effects of systematic bolts on rock mass of high slope ofThreeGorges flight lock[J].Rock andSoilMechanics,1996,17(2):1-6.
[6]高明中.锚杆布置参数对巷道围岩稳定性的影响[J].淮南工业学院学报,2002,22(4):34-38.GAO Ming-zhong.Theoretical analysis and practice of the arrangements of bolting[J].Journal ofHuainanInstitute ofTechnology,2002,22(4):34-38.
[7]高明中.煤巷锚杆支护对动压适应性的研究[J].淮南工业学院学报,1999,19(1):35-39.GAO Ming-zhong.Study on the suitability of bolting in coal gateways with the action of dynamic pressure[J].Journal ofHuainanInstitute ofTechnology,1999,19(1):35-39.
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