Loading-Rate Dependency of Coal Strength.
Loading-Rate Dependency of Coal Strength.
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煤炭强度的装载率依赖性。
DOI：
10.2473/shigentosozai.118.23
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Q. Qi
中科院分区：
文献类型：
--
作者：
S. Okubo;K. Fukui;Q. Qi
对京西某煤矿的无烟煤进行了单轴压缩、单轴拉伸和间接拉伸（巴西）试验，获得了单轴压缩和单轴拉伸的应力-应变全曲线。在单轴拉伸试验的破坏后区域，曲线表现为I类特征，并伴有少量的剩余强度。单轴拉伸试验得到的峰值强度远小于常用的间接拉伸试验，应变速率交替增加和降低，得到加载速率依赖性。当应变速率增加时，应力突然增加一定量，这取决于岩石的加载速率依赖性。实验结果表明，煤岩在单轴压应力和拉应力作用下的加载速率依赖性比作者所试验的大多数岩石都要小。
Uniaxial compression, uniaxial tension and indirect tension (Brazilian) tests were carried out for coal (anthracite) obtained in a coal mine located about 26 km west of Beijing.Complete stress-strain curves not only in uniaxial compression test but also in uniaxial tension test were successfully obtained. In post-failure region of uniaxial tension test, the curve showed Class I characteristics accompanied with small amount of residual strength. The peak strength obtained by the uniaxial tension test was far less than the indirect tensile test frequently conducted.The strain rate was alternatively increased and decreased to obtain the loading-rate dependency. When strain rate was increased, stress increased abruptly by a certain amount depending on the loading-rate dependency of the rock. The experimental results showed that loading-rate dependency of the coal both under the uniaxial compression and tension stress was relatively smaller than the most rocks that had been tested by the authors.