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总览 评价 尚晓吉 1, , 刘卫群 2,* , 宋良 2, ( 1、 中国矿业大学力学与建筑工程学院; 2、 中国矿业大学力学与建筑工程学院,江苏 徐州 221116; ) 摘要: 为了探讨不同围压下加载和卸围压对煤岩材料强度、变形及破坏形式的影响规律,利用岩石破裂过
尚晓吉1,, 刘卫群2,*, 宋良2,
(
1、中国矿业大学力学与建筑工程学院; 2、中国矿业大学力学与建筑工程学院,江苏 徐州 221116; )
摘要:
为了探讨不同围压下加载和卸围压对煤岩材料强度、变形及破坏形式的影响规律,利用岩石破裂过程的分析软件-RFPA2D软件,对不同围压下加载及卸围压的煤样三轴压缩数值模拟。研究结果表明:(1)煤样的峰值强度随着围压的增大而增高,峰值强度对应的极限轴向变形也随着围压的增大而增大。(2)随初始卸载围压的增大,煤样在卸围压时的极限抗压强度呈现增大的趋势。
关键词:
三轴压缩;卸围压;煤;强度;数值模拟
SHANG Xiaoji1,, LIU Weiqun2,*, SONG Liang2,
(
1、School of Mechanics & Civil Engineering,China University of Mining and Technology; 2、School of Mechanics & Civil Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116; )
Abstract:
In order to discuss the law of different confining pressure on the strength, deformation and failure forms of coal specimens when loading and unloading respectively, by use of the RFPA, numerical simulation tests under triaxial compression were performed on coal specimens. The results show that: (1) the peak intensity of coal samples rise as confining pressure increases, and the limit axial deformation corresponding to the peak intensity increase with the increase of confining pressure. (2) With the increase of the initial unloading confining pressure, the trend of the limit compressive strength of coal samples is increasing.
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