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组合岩梁弯曲变形和能量演化试验研究
Experimental study on bending deformation and energy evolution of composite rock beams
投稿时间:2023-06-25  修订日期:2023-09-26
DOI:
中文关键词:  矿震  组合岩梁  弯曲变形  变形破坏  能量演化
英文关键词:Mineral earthquakes  composite rock beams  bending deformation  deformation destruction  Energy evolution
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
宋义敏* 北方工业大学 土木工程学院 100144
张苑玉 北方工业大学 土木工程学院 100144
邓文良 北方工业大学 土木工程学院 100144
赵亚周 北方工业大学 土木工程学院 100144
范辉远 北方工业大学 土木工程学院 100144
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中文摘要:
      以白光数字散斑相关方法作为试验加载全过程的观测手段,采用四点弯曲加载方式作为试验方法,分别从双层组合岩梁的粘结和非粘结试验开展研究工作,研究分析双岩梁在不同情况下加载全过程的变形场和能量场演化过程,对比分析粘结与不粘接岩梁的承载力、层间滑动、能量的变化,从而探究层状岩体弯曲变形层间滑动致震机制。研究结果分析得到:(1)粘结组合岩梁的承载力大于非粘结岩梁,且无粘结组合梁中一根岩梁断裂后并未完全失去承载力,继续同另外一根岩梁抵抗外力;(2)粘结岩梁受力后表现为一个整体,发生一次断裂;无粘结组合岩梁因受层间滑动影响,各层独立运动,断裂次数与岩梁层数相同,由此证明层间有约束的岩层发生一次矿震,而层间无约束的岩层将发生多次矿震;(3)粘结组合岩梁储存能量较大,在断裂释放能量时危害较大;无粘结岩梁能量储存量小,上下梁断裂时均有一次能量释放,危害性较小。
英文摘要:
      Taking the white light digital speckle correlation method as the observation method for the whole process of experimental loading, and the four-point bending loading method as the test method, the research work is carried out from the bonding and non-bonding tests of double-layer composite rock beams, and the deformation field and energy field evolution process of the whole process of loading double-rock beams under different conditions are studied and analyzed, and the changes of bearing capacity, interlayer sliding and energy of bonded and non-bonded rock beams are compared and analyzed, so as to explore the mechanism of sliding seismic formation between layers of bending deformation of layered rock mass. The results of the results show that: (1) the bearing capacity of the bonded composite rock beam is greater than that of the non-bonded rock beam, and one rock beam in the non-bonded composite beam does not completely lose its bearing capacity after breaking, and continues to resist external forces with another rock beam; (2) After the bonded rock beam is stressed, it behaves as a whole and a fracture occurs; Due to the influence of interlayer sliding, the layers of the unbonded composite rock beam move independently, and the number of fractures is the same as the number of rock beam layers, which proves that one mineral earthquake will occur in the constrained rock layer between the layers, while multiple mineral earthquakes will occur in the unconstrained rock layer between the layers. (3) The bonded composite rock beam has a large storage energy, which is more harmful when the energy is released by fracture; The energy storage of the non-bonded rock beam is small, and the energy is released once when the upper and lower beams are broken, which is less harmful.
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