| 三轴压缩条件下岩石突发失稳过程的实验研究 |
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| 引用本文： | 张路,王威,王绳祖.三轴压缩条件下岩石突发失稳过程的实验研究[J].西北地震学报,1993,15(2):30-35,75. |
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| 作者姓名： | 张路 王威 王绳祖 |
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| 作者单位： | 国家地震局地质研究所，国家地震局地质研究所，国家地震局地质研究所 国家地震局地壳应力研究所 |
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| 基金项目： | 地震科学联合基金(编号:89—047) |
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| 摘 要： | 在常温、固体围压介质(铅)三轴压缩的条件下,采用磁带记录的快速数据采集系统,对完整的居庸关花岗岩、迁安石英岩和含不同角度锯切面的居庸关花岗岩试件的突发失稳动态过程进行了实验研究。结果表明,当试件沿内部斜面快速错动而突发失稳时,表现为各点应力和位移的振动、衰减,并趋于新的稳定终止态。根据应力和位移的记录,得到了应力-应变(相对位移)动态合成图。以失稳振动的初动半周期为界,可将整个动态过程划分为摩擦错动阶段和自由振动阶段。实验还表明,突发失稳岩石的动态错距等于或近似于终态错距。实测的动态应力降约为终态应力降的1.6倍。
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| 关 键 词： | 岩石力学 岩石 失稳过程 压缩实验 |
| 收稿时间： | 1991/10/31 0:00:00 |
EXPERIMENTAL STUDY ON SUDDEN INSTABILITY PROCESSES OF ROCKS UNDER TRIAXIAL COMPRESSION |
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| Zhang Lu,Wang Wei and Wang Shengzu.EXPERIMENTAL STUDY ON SUDDEN INSTABILITY PROCESSES OF ROCKS UNDER TRIAXIAL COMPRESSION[J].Northwestern Seismological Journal,1993,15(2):30-35,75. |
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| Authors: | Zhang Lu Wang Wei and Wang Shengzu |
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| Institution: | Institute of Geology, SSB, Beijing, 10029,Institute of Geology, SSB, Beijing, 10029 and Institute of Geology, SSB, Beijing, 10029 |
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| Abstract: | The experimental study on sudden instability processes of the intact Juyongguan granite and Qian'' an quartzite specimens and those of Juyongguan granite with saw cuts are carried out at room temperature and solid confining pressures, using the high speed data collecting system with a video-tape recorder. The result indicates that when specimen slides rapidly along its internal oblique fracturing or sliding belt and instability takes place suddenly in the system, the stresses and displacements of different measured points in the testing system vibrate, attenuate, and tend to a new stable terminal state. The whole dynamic process can be divided, in terms of initial motion semi-period of the vibration, into two stages, frictional sliding stage and free vibration one. The synthetic dynamic stress-strain (relative displacement) curves are created from the stress and displacement data recorded. It is also shown that the maximum dynamic sliding displacement is equal or approximate to that of terminal state and the ratio of dynamic stress drop to terminal one is about 1.6. |
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