分级循环荷载下层理煤岩力学特性试验研究

doi:10.13722/j.cnki.jrme.2020.0643

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摘要为研究层理煤岩在循环荷载作用下的变形破坏与力学特征，沿与层理平行和垂直方向分别制作圆柱形煤岩试样，并开展不同应力上限下的单轴分级循环加卸载试验。基于试验结果，分析在循环荷载过程中试样的残余变形、弹性模量及损伤变量等变化规律，结果表明在低应力循环作用下，2种层理试样的弹性模量均随循环次数的增加而有所上升，但随着应力上限的提升，试样内疲劳损伤不断累积，弹性模量最终呈下降趋势。同时，在循环荷载作用下层理煤岩具有显著的各向异性特征，具体表现为：对于加载方向与层理垂直的试样，其损伤变量在试样发生局部破坏时陡增，呈现出脆性断裂的破坏形式，而加载方向与层理平行的试样在完全破坏前损伤变量呈连续增长趋势，表现出明显的塑性变形特征。

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	刘忠玉
	董旭
	张旭阳

关键词 ：岩石力学, 煤岩, 循环荷载, 层理, 弹性模量, 残余变形, 疲劳损伤

Abstract：In order to study the deformation，failure and mechanical characteristics of bedding coal and rock under cyclic loading，parallel bedding and vertical bedding cylindrical coal samples were made，and uniaxial graded cyclic loading and unloading tests were carried out under different upper stress limits. Based on the test results，the residual deformation，elastic modulus and damage variables of the specimens during the cyclic loading process are analyzed. The results show that the elastic modulus of the two layered specimens varies with the number of cycles under low stress cycles. However，as the upper limit of stress increases，the fatigue damage in the specimen continues to accumulate，and the elastic modulus eventually shows a downward trend. At the same time，bedding coal and rock under cyclic loading have significant anisotropy characteristics. The specific manifestation is：for the sample with the loading direction perpendicular to the bedding，the damage variable increases sharply when the sample is locally damaged，showing brittle fracture，However，the damage variable of the specimen with the loading direction parallel to the layering showed a continuous growth trend before complete failure，showing obvious characteristics of plastic deformation.

Key words： rock mechanics coal rock cyclic loading bedding elastic modulus residual deformation fatigue damage

引用本文:

刘忠玉，董旭，张旭阳. 分级循环荷载下层理煤岩力学特性试验研究[J]. 岩石力学与工程学报, 2021, 40(S1): 2593-2602.
LIU Zhongyu，DONG Xu，ZHANG Xuyang. Experimental study on mechanical properties of bedding coal and rock under graded cyclic loading. , 2021, 40(S1): 2593-2602.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0643 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS1/2593

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