| 考虑围岩流变特性的地震尖点型突变模型 |
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| 引用本文： | 徐曾和,徐小荷.考虑围岩流变特性的地震尖点型突变模型[J].岩土力学,2000,21(1):24-27. |
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| 作者姓名： | 徐曾和 徐小荷 |
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| 作者单位： | 东北大学,岩石失稳与破裂研究中心,辽宁,沈阳,110006 |
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| 基金项目： | 国家自然科学基金资助项目! (No.597790 0 3) |
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| 摘 要： | 考虑到断层两盘围岩的粘弹性和断层的应变弱化,建立了断层地震的简化力学模型,首先证明了该模型对应于尖点突变,后利用尖点突变理论研究地震的非稳定机制,阐明只有当外界对系统输入足够的能量,且刚度比小于１时,系统内的能量才能迅地转移与释放,引起地震。而孕震时间既与远场位 关又与围岩的粘弹性性质有关。
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| 关 键 词： | 断层 地震 粘弹性 尖点突变 孕震 围岩 流变特性 |
| 收稿时间： | 1999-04-02 |
| 修稿时间： | 1999-04-02 |
Instability of fault earthquake in rheological media and cusp catastropho |
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| Xu Zenghe,Xu Xiaohe.Instability of fault earthquake in rheological media and cusp catastropho[J].Rock and Soil Mechanics,2000,21(1):24-27. |
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| Authors: | Xu Zenghe Xu Xiaohe |
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| Institution: | Center of Rockburst and Induced Seismicity Reserch , Northeastern University, Shenyang 110006, China) |
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| Abstract: | Considering the strain weakness behavior of fault and the
visco-elasticity of surrounding rocks. A simple mechanical model for fault earthquake is
put forward. First, the equivalency between the model and cusp catastrophe is proven.
Then, the cusp catastrophe theory is applied to analyse the instability mechanism of the
fault earthquake. It is explicated that the quick transferring of energy and the violent
releasing of energy don't take place unless the enough energy from external world is input
into the mechanical system and the stiffness ratio is less than unit. The period of
seismogeny is both related to the period of loading owing to distant field displacement
and to the visco-elasticity behavior of surrounding rocks. |
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| Keywords: | fault earthquake instability visco elasticity cusp catastrophe siesmogeny |
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