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本文主要是对前兆异常应力场的两种模式——“外应力集中作用”模式和“闭锁区”模式的力学机制及其特征作了分析、比较和某些拓展。文中给出了这两种模式在各种不同情况下的有关数学公式。分析结果表明:当外应力的作用方式和作用部位不同(前一模式)或断裂的方位和闭锁区所在的位置不同(后一模式)时,相应的异常应力场的特征和分布也会因此而有不同程度的差异。但不论在哪一情况下,除了相当靠近应力作用区、闭锁区及断裂端点的个别部位外,在绝大部分的地区上,这两种模式所对应的异常场并无本质上的区别。
This paper mainly analyzes, compares and expands the two modes of the anomalous stress field of precursors - the mechanism of “stress concentration outside” mode and the “lock-in area” mode. The paper gives the relevant mathematical formulas of the two modes in different situations. The results show that the characteristics and distribution of the corresponding anomalous stress field will be different when the mode of action of external stress is different from that of the action site (previous mode) or the location of the fracture zone (latter mode) There are different degrees of difference. In either case, however, there is no essential difference in the anomalous fields corresponding to these two modes over the vast majority of the regions, except for parts that are quite close to the stress zone, the lockup zone and the breakpoint.