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本文讨论了华北地区地壳应力场的成因,选用简化的数学模型;一个在远场承受单向压缩的、具有椭圆型刚性核的无限大Hooke平板的平面应力问题进行的计算,与实际测定结果对比表明,华北地区地壳应力场的主要力源可能是太平洋板块向西俯冲产生的水平挤压力,鄂尔多斯地块周围的应力场与华北地区的应力场在成因上有密切联系,它们似乎是在同一个力源作用下形成的。鄂尔多斯地块周围的地壳应力场与华北地区地壳应力场存在着明显差异的原因大概是完整性好的鄂尔多斯稳定地块存在所引起的明显的介质性非均一性。
In this paper, the causes of the crustal stress field in North China are discussed, and a simplified mathematical model is adopted. A plane stress problem of an infinite Hooke plate with elliptic rigid core subjected to unidirectional compression in the far field is calculated. Compared with the actual measurement results It is indicated that the main source of crustal stress field in North China may be the horizontal squeezing pressure caused by the western subduction of the Pacific plate. The stress field around the Ordos block is closely related to the genesis of the stress field in North China. The formation of a force source. The reason why the crustal stress field around the Ordos block and the crustal stress field in North China are obviously different is probably the obvious dielectric heterogeneity caused by the existence of the integrity Erdos stable block.