【摘要】 根据材料力学纵弯杆概念,从定量角度分析了横向剪应力在纵弯褶曲中的分布和演化。纵弯褶曲的受力状态和变形情况与受轴向挤压面弯曲的矩形横断面纵弯杆相类似。由于纵弯杆中横向剪应力呈扇型分布,所产生的逆冲断层亦组成剖面上的扇型。扇状逆冲断层往往在褶曲陡翼发育,产生于褶皱变形达到一定阶段之后。更多还原

【Abstract】 On the basis of the concept of the vertical crooked arm in material mechanics, a quantitave analysis of the distribution and evolution of horizontal shear stress in vertical folding is discussed.The stressed state of vertical folds in the case of deformation are similar to the vertical crooked arm of rectangwar horizontal sections deformed as a result of extruding The horizontal shear stress distributed in the vertical crooked arm results in a fan shaped Pattern,thus thrust faults which are formed in the same manner also exhibit the same fan-shaped paffern.The thrust faults with a fan-shaped often are evolved in the steep wing and are formed after the fold deformations have reached a definite stage.更多还原