| 在围压条件下切口岩石破裂过程的实验研究 |
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| 引用本文： | 李建国,吴秀泉,张渤涛,刘天昌.在围压条件下切口岩石破裂过程的实验研究[J].地震地质,1984,6(2):75. |
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| 作者姓名： | 李建国 吴秀泉 张渤涛 刘天昌 |
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| 作者单位： | 国家地震局地质研究所
(李建国，吴秀泉，张渤涛)，国家地震局地质研究所(刘天昌) |
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| 摘 要： | 本文根据地震的断层说观点在室温、围压600—1,200巴条件下研究了具切口的花岗闪长岩、辉长岩和大理岩试件的破裂发展过程。在连续增加的差应力作用下观测到:切口内部充填的软弱夹层首先发生剪切变形和破裂,接着在切口端部一侧扩展张性裂纹,然后在切口前缘方向扩展剪切裂纹,最后发生贯通试件的剪切和张裂-剪切主破坏。张裂纹扩展长度受到围压的强烈抑制。岩石的切口结构和岩性变化对破裂迹线的空间展布和主破坏机制有重要影响。讨论了实验结果在断层扩展型地震的形成过程及其在预报预测方面的意义
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| 关 键 词： | 双切口 差应力 岩石破裂 发震断层 张裂 岩石试件 前震活动 主破裂面 裂发 压条 |
EXPERIMENTAL STUDIES ON FAILURE PROCESSES OF SAW-CUT ROCKS UNDER CONFINING PRESSURE |
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| Abstract: | According the viewpoint of the earthquake caused by the faulting, the failure of such saw-cut rock specimens as granodiorite, gabbro and mable was studied under room temperature and confining pressure, σ2 = σ3 = 0.6 -1.2kb. During the increase of differential stress, shear strains and fractures started to occur at soft material filling tne saw-cut rock, then the tension crack appeared at the tip of the saw-cut and finally the main rupture, shear/tensile rupture occurred at the same tip nearly parallal to the sawcut strike.Extending tensional cracks were restricted by confining pressure. The distribution of cracks and mechanisms of main ruptrue were influenced by making of the sawcut and properties of rocks. Significance of these results was discussed in the preparation and prediction of the earthquake |
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