伸展构造物理模拟中存在的问题及解决办法

通过设计多组试验模型、筛选材料的湿度及颗粒大小、调整边界断层的倾角和滑脱面深度、改变边界受力方向和大小进行试验,对比各因素对试验结果的影响,分析各环节存在的问题并寻求解决办法。结果表明:在相同的边界条件下,材料的湿度增大会抑制模型中断层的产生,滚动颗粒比例的增加不利于断层在平面上的保存;距离边界断层一定范围L0内,断层的产生受张应力和重力共同作用,次级断层与边界断层近平行,距离大于L0后模型变形主要受张应力控制,产生与其近垂直的断层;合理设计的模型可以解决边掀斜边伸展模型中力的传导问题。

Problems and solutions in physical simulation of extensional structures

By designing various experimental models,filtrating the humidity and the particle size of the material,adjusting the dip of the boundary fault and the depth of the detachment surface,and changing the direction and size of the force exerted on the boundary,the impacts of various factors on the experimental results were compared,and the problems existing in every sectors were analyzed and solved.The results show that under the same boundary conditions,the generation of faults in the model is inhibited with the increase of the material humidity,and the faults on the plane are not easy to be preserved with the increase of the rolling particles proportion.Within the distance of L0 from the boundary faults,the secondary faults are formed with the common effect of tension stress and gravity,nearly parallel with the boundary faults.Beyond the distance of L0,the model deformation is mainly controlled by the tension stress,and the generated faults are perpendicular to the tension stress.Force conduction problems existing in the model with stretch and tilt can be solved with the well-designed model.