挤压(拉张)构造应力场的叠加分析——联合构造应力场研究(Ⅱ)

ANALYSIS OF SUPERPOSITION OF COMPRESSIVE(TENSILE)TECTONIC STRESS-FIELDS——Research on combined tectonic stress-fields(Ⅱ)

地壳内同时同地作用的两个或两个以上构造应力场,必然叠加为统一的联合构造应力场。该文研究了挤压(拉张)型均匀应力场和非均匀应力场的叠加问题,计算了压(拉)型非均匀联合叠加构造应力场的应力分布,认为地壳岩石的许多变形组合型式都受到压(拉)非均匀联合应力场的控制。

Two or more tectonic stress-fields, acting at the same region simultaneously, are bound tosuperpose to an unified combined tectonic stress-field. The superposition of tectonic stress-fields is thesuperposition of stress-states at every point within the field. Two or more compressive or tensile homo-geneous stress-fields superpose to a homogeneous combined stress-field, in which the combined principalstresses remain constant. Two or more inhomogeneous stress-fields superpose to an inhomogeneous combined stress-field, in which the combined principal stresses or stress-differences vary regularly. The general mathematical solution of inhomogeneous combined stress-field is presented and thedistribution of combined principal stress-differences is calculated in this paper. The geometric propertiesand deformation features of the most basic combined tectonic pattern can be interpreted in terms of su-perposition of compressive or tensile tectonic stress-fields.