| 地热与地震关系的研究(一)——弹性介质中椭圆盘状裂纹尖端附近的热应力分布 |
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| 引用本文： | 安镇文,朱传镇.地热与地震关系的研究(一)——弹性介质中椭圆盘状裂纹尖端附近的热应力分布[J].地震学报,1984,6(2):211-222. |
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| 作者姓名： | 安镇文 朱传镇 |
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| 作者单位： | 国家地震局地球物理研究所 |
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| 摘 要： | 近年来,人们越来越多地注意到地震发生前所存在着的地温增高的各种异常现象.本文以这些异常现象为根据,试图探讨地热变化与地震孕育的关系.文章假定,无限弹性介质中含有椭圆盘状断层面,并以此断层面为热通道.考虑在压应力作用下,温度为 x,y 的线性函数分布在此通道内,根据线弹性断裂力学观点,借助断裂力学中三维问题的解法,求出了断层面边缘附近的应力场和应力强度因子.结果表明,热应力有千巴的量级,并较定量地讨论了热应力大小与介质线膨胀系数的关系.最后简要地讨论了介质线膨胀系数的变化对地震孕育的影响.
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STUDY OF GEOTHERMAL VARIATIONS IN RELATION TO LARGE EARTHQUAKES (1)--THE DISTRIBUTION OF THERMAL STRESSES IN THE NEIGHBORHOOD OF THE SHARP END OF AN ELLIPTICAL-SHAPED CRACK IN AN INFINITE ELASTIC MEDIUM |
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| Institution: | Institute of Geophysics, State Seismological Bureau |
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| Abstract: | It is noted that several abnormal phenomena associated with the increase of ground temperature have been observed before large earthquakes. In this paper, the relations between geothermal variations and the preparatory process of large earthquakes are investigated theoretically. It is assumed that there is an elliptical-shaped crack in an infinite elastic medium as a geothermal channel as well as an earthquake fault, the pressure and the temperature distributed in the crack as a linear funtion of x and y are taken into account. From the view point of linear elastic fracture mechanics, the stress field and stress-intensity factor around the crack tip have been obtained in terms of the method suggested by Kassir et al.The result shows that thermal stress might be of the order of kilobar. The relations between the magnitude of thermal stress and the thermal expansion coefficient of the medium are analysed. Finally, the effects of variations of on the seismo-genetic process are discussed briefly. |
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