煤岩稳定性与变形局部化演化关联性实验研究

doi:10.13722/j.cnki.jrme.2021.0078

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摘要采用单轴压缩实验方法开展煤试件变形破坏全过程的稳定性与变形局部化演化关联性研究，选取一种煤作为试件，以数字散斑相关方法观测试件变形局部化演化规律，分析变形局部化带的拉伸位移及速率、滑动位移及速率演化，变形局部化带剪应力位移演化关系，以及变形过程中的围岩能量演化。研究结果表明：(1) 煤岩变形破坏过程中，煤岩承载力的降低是由煤岩变形局部化带的拉伸位移和滑动位移突变引起；(2) 煤岩宏观上整体稳定性既和变形局部化带等效刚度有关，也和变形局部化带的剪应力降幅有关；(3) 在试件失稳过程中，发现围岩变形能释放与应力释放具有非同步性现象，即应力释放滞后于围岩的变形能释放。

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	吕祥锋1
	朱晨利2
	宋义敏2
	许海亮2
	安栋2

关键词 ：采矿工程, 煤岩失稳, 数字散斑相关方法, 变形局部化, 变形能密度

Abstract：The correlation between the stability of coal specimens during the whole process of deformation and damage with the evolution of deformation localization was studied by uniaxial compression test method. A kind of coal was selected as the test piece，and the deformation localization evolution of the specimens was observed by digital speckle correlation method. The tensile displacement and rate，the sliding displacement and rate and the shear stress displacement of the deformation localization band，as well as the energy evolution of the surrounding rock during deformation，were analyzed. The results show that，in the process of deformation and failure of coal and rock，the reduction of the bearing capacity of coal and rock is caused by the abrupt changes of tensile and sliding displacements in the deformation localization band of coal and rock，that the overall stability of coal and rock at the macro level is related to both the equivalent stiffness and the shear stress reduction of deformation localization band，and that，in the process of specimen instability，the deformation energy release and the stress release of the surrounding rock are not synchronized，that is，the stress release lags behind the deformation energy release of the surrounding rock.

Key words： mining engineering')" href="#">

mining engineering coal rock instability digital speckle correlation method deformation localization deformation energy density

引用本文:

吕祥锋1，朱晨利2，宋义敏2，许海亮2，安栋2. 煤岩稳定性与变形局部化演化关联性实验研究[J]. 岩石力学与工程学报, 2021, 40(12): 2466-2476.
LV Xiangfeng1，ZHU Chenli2，SONG Yimin2，XU Hailiang2，AN Dong2. Experimental study on the correlation between coal rock stability and deformation localization evolution. , 2021, 40(12): 2466-2476.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0078 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I12/2466

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