| 两种应力路径下无烟煤的变形破坏特征及能量分析 |
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| 引用本文： | 王 凯,郑吉玉,朱奎胜.两种应力路径下无烟煤的变形破坏特征及能量分析[J].岩土力学,2015,36(Z2):259-266. |
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| 作者姓名： | 王 凯 郑吉玉 朱奎胜 |
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| 作者单位： | 1. 中国矿业大学（北京） 资源与安全工程学院，北京 100083；2 河南工程学院 土木工程学院，河南 郑州 451193 |
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| 基金项目： | 国家自然科学基金（No.51174212，No.51304213，51474219）；高等学校博士学科点专项科研基金博导类资助课题（No.20120023110006）；河南省生物遗迹与成矿过程重点实验室基金（No.OTMP1410） |
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| 摘 要： | 煤矿井下巷道开挖及采煤是一个卸围压过程，与常规三轴压缩试验相比，煤岩在卸围压时表现出不同的力学性质。通过对常规三轴和卸围压两种应力路径下的试验研究发现，无论是常规三轴还是卸围压试验，高围压均导致煤样更大的应变和更强烈的破坏。在初始围压相同的情况下，与常规三轴试验相比，卸围压试验中峰值点割线模量较小、割线泊松比较大；煤样在卸围压时的破坏更强烈，侧向应变较大，而轴向应变差别不大。通过卸围压效应系数分析发现，初始围压越高和卸围压速率越大，煤样的卸围压效应系数越小，越易失稳破坏，与高围压下割线模量降低相一致。对常规三轴和卸围压试验中无烟煤破坏过程的能量变化分析结果表明，卸围压速率越快，煤样的极限储存能Up越小，煤样越易失稳破坏，验证了卸围压效应系数分析结果。高围压下常规三轴试验和卸围压试验中煤样的破坏需要更多的能量，揭示了高围压下煤样变形破坏强烈的多的原因。
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| 关 键 词： | 常规三轴试验 卸围压 变形破坏 能量分析 |
| 收稿时间： | 2014-08-09 |
Analysis of deformation failure characteristics and energy of anthracite under two kinds of stress paths |
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| WANG Kai,ZHENG Ji-yu,ZHU Kui-sheng.Analysis of deformation failure characteristics and energy of anthracite under two kinds of stress paths[J].Rock and Soil Mechanics,2015,36(Z2):259-266. |
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| Authors: | WANG Kai ZHENG Ji-yu ZHU Kui-sheng |
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| Institution: | 1. Faculty of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2. School of Civil Engineering, Henan Institute of Engineering, Zhengzhou, Henan 451193, China |
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| Abstract: | Roadway excavation and mining underground coal mine is a process of unloading confining pressure. Compared with the conventional triaxial compression test, the coal rock showed different mechanical properties during unloading confining pressure. Based on two kinds of stress paths the conventional triaxial and unloading confining pressure tests, it is found that both the conventional triaxial or unloading confining pressure test, the coal sample caused by high confining pressure are greater strain and more intense failure. In the case of the same initial confining pressure, compared with the conventional triaxial test, unloading confining pressure tests peak secant modulus is smaller, secant Poisson’s ratio is larger; coal sample failure more intense when unloading confining pressure, the lateral strain is larger, and the axial strain but little difference. By unloading confining pressure effect coefficient analysis, it is found that the higher the initial confining pressure and the greater the rate of unloading confining pressure, the unloading confining pressure effect coefficient of coal sample is smaller, the more easily failure of coal sample, the secant modulus under high confining pressure decrease is consistent. Conventional triaxial and unloading confining pressure test failure process of energy change of anthracite analysis show that: the faster the rate of unloading confining pressure, the limit stored energy of coal samples is smaller, more easily instability and failure to verify the unloading confining pressure effect coefficient analysis results. In high confining pressure, coal sample failure requires more energy under conventional triaxial tests and unloading confining pressure test, reveal that higher confining pressure of coal sample, the stronger failure. |
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| Keywords: | conventional triaxial test unloading confining pressure deformation failure energy analysis |
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