通过地质力学模型试验研究了逆断层活动在沉积层中的传播模式、以及引起沉积层变形和破裂的特征。试验中采用数字散斑相关方法计算沉积层表面变形的位移场,并采用高精度数码摄像系统捕捉和记录活动断层在沉积层中的破裂扩展过程。逆断层在沉积层中向上扩展时形成了一个剪切带,且断层倾角越小,沉积层中的剪切带就越宽;而基岩断层的抬升位移和滑移速度越大时,沉积层中的剪切带也越宽、变形越强烈。当断层抬升位移达到某一临界值时,沉积层表面的隆起将会出现拉张裂缝。在相同的沉积层厚度和断层抬升位移条件下,基岩断层抬升速度越大时,沉积层表面“,”Geomechanical model tests were performed on wet sand in a glass-walled fault rest box to investigate the relationship between the propagation of fault rupture and the shapes,and the locations of failure surface.Three CCD cameras were used to capture the p