| 孕震过程中孔隙压及地下水位变化的数值模拟 |
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| 引用本文： | 张永仙,石耀霖.孕震过程中孔隙压及地下水位变化的数值模拟[J].地震,1994(1):65-72. |
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| 作者姓名： | 张永仙 石耀霖 |
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| 作者单位： | 国家地震局分析预报中心，国家地震局分析预报中心，中国科学院研究生院 中国北京 100036，中国北京 100036，中国北京 100039 |
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| 摘 要： | 地震孕育过程中孕震区内各点的应力应变都将发生变化，介质的物性参数也将改变，因此孔隙压和地下水位随之改变。本文在研究孕震过程中包括扩容和断层蠕变效应在内的应力应变场的基础上，根据应力场与孔隙压场的耦合方程，把孔隙压场随应力场的应力变化定量地计算出来。计算结果表明，孕震过程中孔隙压的变化与应力场变的化的强弱及南的渗透性能等因素相关。孕震过程后期，震源区表现为扩容区并且孔隙压强以负压为主，此结果显示着震
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| 关 键 词： | 孔隙压 孕震过程 地下水 水位变化 |
NUMERICAL SIMULATION OF PORE PRESSURE AND GROUND WATER LEVEL VARIATION IN EARTHQUAKE PREPARATION |
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| Zhang Yongxian Shi Yaolin Zhang Guomin.NUMERICAL SIMULATION OF PORE PRESSURE AND GROUND WATER LEVEL VARIATION IN EARTHQUAKE PREPARATION[J].Earthquake,1994(1):65-72. |
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| Authors: | Zhang Yongxian Shi Yaolin Zhang Guomin |
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| Abstract: | The paper analysed stress and strain field including the effect of rock dilatancy and fault creeping in earthquake preparation, according to coupling equation of stress and pore pressure field, the pore pressure field variation along with stress field can be calculated. The results showd that the variation of pore pressure are related to intensity of stress variation and capacity of medium osmosis. First extremum area of pore pressure concentrated at fault extreme, then turned to middle of blocking part according to fault creeping in earthquake preparation. In the later period of earthquake preparation, the source was the dilatant area as well as pore pressure in most area was negative, which can explain why the ground water level changed abnormally before earthquakes. The ground water flow can make us easier to understand the mechanism of occurred anomlies, such as water Radon, water chemistry and water temperature and so on. |
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| Keywords: | rock mass dilatancy body dilatation pore pressure coupling equation earthquake preparation |
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