论文部分内容阅读
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α的关系。最后简要地讨论了介质线膨胀系数α的变化对地震孕育的影响.
In recent years, people pay more and more attention to all kinds of anomalies that exist before the earthquake, and based on these anomalies, this paper attempts to discuss the relationship between geothermal changes and earthquake gestation. The paper assumes that an infinitely elastic medium contains an elliptical disc-shaped fault plane and uses this fault plane as a thermal path. Considering that the linear function of temperature x and y is distributed in this channel under compressive stress, according to the linear elastic fracture mechanics , The stress field and the stress intensity factor near the edge of the fault plane are obtained by the solution of the three-dimensional problem in fracture mechanics.The results show that the thermal stress has the magnitude of one thousand bar, and the relationship between the thermal stress and the coefficient of linear thermal expansion α relationship. Finally, the influence of the change of medium linear expansion coefficient α on the earthquake gestation is briefly discussed.