| 自然及强制饱和煤样的力学特征试验研究 |
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| 引用本文： | 杨伟杰,王文,,,李东印,,王杰,刘文超.自然及强制饱和煤样的力学特征试验研究[J].中国安全生产科学技术,2017,13(11):129-134. |
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| 作者姓名： | 杨伟杰 王文 李东印 王杰 刘文超 |
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| 作者单位： | （1．河南理工大学，能源科学与工程学院，河南 焦作 454003；2. 山西煤炭进出口集团有限公司，
山西 太原 030006 3.煤炭安全生产河南省协同创新中心，河南 焦作 454003） |
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| 摘 要： | 为探讨不同饱水状态下煤的力学变化特征，利用RMT-150B岩石力学系统并自行设计及研制煤样饱和试验装置，对自然饱和与强制饱和的煤样进行单轴、三轴压缩静载试验。结果表明:煤样强制饱和前后波速变化明显，强制吸水后波速增加51.75%；强制饱和煤样单轴抗压强度比自然饱和煤样平均降低了7.61MPa，降幅54.83%；三轴压缩时不同围压下强制饱和煤样峰值强度平均降低了19.5MPa，降幅31.18%；强制饱和煤样吸水量较自然饱和煤样大，K值降低。基于Mohr-Coulomb准则及有效应力原理，推导出孔隙水压与黏聚力、抗压强度呈负相关，表明强制饱和煤样的黏聚力与抗压强度均低于自然饱和煤样，并与试验结果对比验证。
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| 关 键 词： | 煤样 自然饱和 强制饱和 单轴压缩 三轴压缩 |
Experimental study on mechanical characteristics of coal samples in natural and forced saturation state |
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| YANG Weijie,WANG Wen,,,LI Dongyin,,WANG Jie,LIU Wenchao.Experimental study on mechanical characteristics of coal samples in natural and forced saturation state[J].Journal of Safety Science and Technology,2017,13(11):129-134. |
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| Authors: | YANG Weijie WANG Wen LI Dongyin WANG Jie LIU Wenchao |
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| Affiliation: | (1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454000, China;
2. Shanxi Coal Import and Export Group Co., Ltd., Taiyuan Shanxi 030006, China;
3. Coal Production Safety Collaborative Innovation Center in Henan Province, Jiaozuo Henan 454000, China) |
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| Abstract: | In order to study the mechanical change characteristics of coal samples under different saturation states, an experimental device of coal sample in different saturation state was designed and developed by using the RMT-150B rock mechanics test system, and the uniaxial and triaxial compression static load tests were conducted on the coal samples in natural and forced saturation stats. The results showed that the wave velocity changed obviously before and after the forced saturation of coal samples, and the wave velocity increased by 51.75% after the forced saturation. The uniaxial compressive strength of coal samples in forced saturation state decreased by 7.61 MPa and 54.83% decreasing amplitude than that of coal samples in natural saturation state on the average. Under the triaxial compression, the peak intensity of coal samples in forced saturation state under different confining pressures decreased by 19.5 MPa and 31.18% decreasing amplitude on the average. The water absorption capacity of coal samples in forced saturation state was larger than that of coal samples in natural saturation state, and the K value decreased. Based on the Mohr-Coulomb criterion and the effective stress principle, it was deduced that the pore water pressure has a negative correlation with the cohesive force and compressive strength, which showed that the cohesive force and compressive strength of coal samples in forced saturation state were both lower than those of coal samples in natural saturation state, and the results were verified by comparing with the experimental results. |
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| Keywords: | coal sample natural saturation forced saturation uniaxial compression triaxial compression |
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