循环荷载作用下煤样疲劳特性的试验研究
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摘要
在地下采矿工程活动中,煤岩体时常受到循环荷载作用致使煤体强度降低,从而减少煤柱及巷道的服务年限。本文借助MTS815岩石力学试验机、核磁共振(NMR)无损检测仪对不同应力幅值的煤样进行疲劳损伤研究。结果表明,随着应力幅值的增加,煤的弹性模量、泊松比、滞回环面积以及加卸载响应比均逐渐增加,该结果提供了有益的参考价值。
In underground mining engineering activities, coal and rock masses are often subjected to cyclic loading which result in decrease in strength of coal mass and reduce the service life of coal and rock masses. In order to analyze the evolution law of fatigue damage of coal, the cyclic loading-unloading test of coal samples is conducted on MTS815 rock mechanics and NMR testing system. The results show that the elastic modulus, Poisson's ratio, the hysteresis loop area and load/unload response ratio of coal gradually increase with the increase of stress amplitude. The results provide useful reference value.
In underground mining engineering activities, coal and rock masses are often subjected to cyclic loading which result in decrease in strength of coal mass and reduce the service life of coal and rock masses. In order to analyze the evolution law of fatigue damage of coal, the cyclic loading-unloading test of coal samples is conducted on MTS815 rock mechanics and NMR testing system. The results show that the elastic modulus, Poisson's ratio, the hysteresis loop area and load/unload response ratio of coal gradually increase with the increase of stress amplitude. The results provide useful reference value.
引文
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[3]赵毅鑫,龚爽,滕腾,等.单轴多级循环加载下原煤加卸载响应比演化特征[J].岩石力学与工程学报,2018,37(05):1096-1105.
[4]ISRM Testing Commission.Suggested method for determining tensile strength of rock materials[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1978,15(3):99-103.
[5]张浪平,余怀忠,尹祥础,等.加卸载响应比方法在结构灾变预测中的应用[J].工程力学,2010,27(03):228-234.
[2]周家文,杨兴国,符文熹,等.脆性岩石单轴循环加卸载实验及断裂损伤力学特性研究[J].岩石力学与工程学报,2010,29(06):1173-1183.
[3]赵毅鑫,龚爽,滕腾,等.单轴多级循环加载下原煤加卸载响应比演化特征[J].岩石力学与工程学报,2018,37(05):1096-1105.
[4]ISRM Testing Commission.Suggested method for determining tensile strength of rock materials[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1978,15(3):99-103.
[5]张浪平,余怀忠,尹祥础,等.加卸载响应比方法在结构灾变预测中的应用[J].工程力学,2010,27(03):228-234.