| 孔隙压力扩散与水库诱发地震活动性的初步研究 |
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| 引用本文： | 龚钢延.孔隙压力扩散与水库诱发地震活动性的初步研究[J].西北地震学报,1988,10(1):52-59. |
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| 作者姓名： | 龚钢延 |
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| 作者单位： | 国家地震局兰州地震研究所 |
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| 基金项目： | 国家地震局地震科学基金 |
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| 摘 要： | 水库诱发地震活动与水的渗透有密切关系,本文认为水库诱发地震中,前震活动主要是由于水的渗透引起孔隙压力扩散,岩石强度弱化所致。由于水库区地下岩石渗透性质的复杂性,将库区岩石介质分为均匀、非均匀渗透的两种情况,利用两相(固、液)多孔介质中孔隙压力扩散理论,分别对水库蓄水所引起的孔隙压力场进行了数值模拟计算,计算结果表明,非均匀渗透模型中水渗透所形成的孔隙压力分布与水库地震发生的空间位置对应得较好,孔隙压力峰值扩散到水库诱发地震的前震震源处的时间(1.8天～45天)与水库蓄水后引起前震活动的滞后时间大体一致。
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| 收稿时间： | 1987/3/5 0:00:00 |
PRIMARY RESEARCH ON PORE PRESSURE DIFFUSION WITH RESERVOIR-INDUCED SEISMICITY |
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| Gong Gangyan.PRIMARY RESEARCH ON PORE PRESSURE DIFFUSION WITH RESERVOIR-INDUCED SEISMICITY[J].Northwestern Seismological Journal,1988,10(1):52-59. |
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| Authors: | Gong Gangyan |
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| Institution: | Seismological Institute of Lanzhou, State Seismological Bureau |
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| Abstract: | Reservoir induced seismicity is closely related with water permeating. The paper considers that the pre-earthquake activities in reservoir induced seismicity are mainly due to pore pressure diffusion produced by water permeating and the weakness of rock strength. As result of complexity of permeating property in underground rock beneath reservoir region, it is divided into two cases which are respectively homogeneous and inhomogeneous permeating in reservoir rock medium. Then, this paper has used the theory on pore pressure diffusion in porous media of solid-liquid two phases so as to calculate in numerical analog the pore pressure field produced by reservoir impounding. It is shown by calculated results that the distribution of pore pressure due to water permeating in inhomogeneous seeping models is corresponded well with the spacious position of reservoir seismicity. The time (1.8~45 days) of diffusion from peak of pore pressure to pre-earthquake focus of reservoir induced seismicity is about the same as the lag of the pre-earthquake activity produced by reservoir impounding. |
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