| 水力耦合作用下的砂岩声发射特性试验研究 |
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| 引用本文： | 陈子全,李天斌,陈国庆,张航.水力耦合作用下的砂岩声发射特性试验研究[J].岩土力学,2014,35(10):2815-2822. |
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| 作者姓名： | 陈子全 李天斌 陈国庆 张航 |
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| 作者单位： | 成都理工大学 地质灾害防治与地质环境保护国家重点实验室，成都 610059 |
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| 基金项目： | 国家自然科学基金资助项目(No.41230635，No.41002110，No.41272330)；交通运输部西部交通建设科技项目(No.20113188051090)。 |
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| 摘 要： | 水压会刺激岩石裂纹的产生和加速岩石破裂,对岩石的变形破坏特征和破坏机制有重要影响。利用MTS815 Flex Test GT岩石力学试验系统和PCI-Ⅱ声发射仪开展了砂岩在不同围压下的水-力耦合试验。结果表明:在整个岩石破裂过程中,声发射活动随加载时间、应力变化表现出不同的特征;声发射活动在岩石的峰后阶段随着水压的增大更为集中,强度也更高,而随着围压的增大其集中程度和强度都有所降低;在相同围压下,声发射累计振铃计数和累计能量随着水压的增大而增大,在相同水压下,声发射累计振铃计数和累计能量则随着围压增大而有所减少;随着水压的增大,岩石最终失稳破坏时刻的声发射三维定位图中裂纹数量增多,裂纹的集中程度也更高,在宏观破坏形态上表现出破坏角减小。这些成果揭示了水-力耦合作用下岩石的破坏机制由压制剪切向压制张裂变化,岩石破裂的脆性破坏特征增强。
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| 关 键 词： | 岩石力学 水力耦合试验 岩石破坏 声发射 声发射计数 声发射能量 |
| 收稿时间： | 2013-11-08 |
Experimental study of acoustic emission characteristics of sandstone under hydro-mechanical coupling action |
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| CHEN Zi-quan,LI Tian-bin,CHEN Guo-qing,ZHANG Hang.Experimental study of acoustic emission characteristics of sandstone under hydro-mechanical coupling action[J].Rock and Soil Mechanics,2014,35(10):2815-2822. |
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| Authors: | CHEN Zi-quan LI Tian-bin CHEN Guo-qing ZHANG Hang |
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| Institution: | State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | Water pressure could stimulate rock crack and accelerate the process of rock failure, this has an important influence on the deformation characteristics and failure mechanism of rock. A hydro-mechanical coupling test of sandy rock is conducted at different confining pressures by MTS815 Flex Test GT rock mechanics test system and PCI-Ⅱ acoustic emission (AE) system. The experimental results are displayed as follows: AE activity represents different characteristics with the loading time and stress changing during the total loading process. With the increase of water pressure, the AE activity is more concentrated and strength is higher after the stress reaches the peak strength of rock. But concentration and strength reduce with the increase of confining pressure. At the same confining pressure, the AE counts and energy increase as the water pressure increases. As the water pressure increases, the number of cracks enhances and the degree of concentration of crack is higher in the 3-D location of AE figures when the rock is unstable failure. At the same time, the failure angle decreases on the macroscopic failure morphology. These results reveal that the mechanism of rock failure changes from suppression of shear to suppression of tension rift; its plasticity is weakened and brittleness is enhanced under hydro-mechanical coupling process. |
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| Keywords: | rock mechanics hydro-mechanical coupling test rock failure acoustic emission (AE) acoustic emission counts acoustic emission energy |
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