中文摘要：

基于可获得半精确解的辛理论，结合叠前逆时偏移成像条件，构建了一种辛几何格式的叠前逆时偏移成像算法。对用数值模拟方法得到的含水平缺陷结构的波场进行辛几何格式偏移成像处理，成功显示了缺陷的位置和方向。利用实验采集含复杂裂缝的混凝土试件的声波场，并对其进行辛几何格式偏移成像处理，获得了缺陷的图像。数值模拟和实验均表明，辛几何格式偏移成像算法可以给出含有多种缺陷结构的成像结果，成像无延迟误差。

英文摘要：

Based on the semi-exact solution available Symplectic Geometry theory, with the pre-stack reverse time migration conditions,a pre-stack reverse time migration algorithm which can show the internal structure of defects is constructed. The wave field of the structure with horizontal fracture obtained by numerical simulation was calculated with the symplectic geometry format migration imaging method, the location and direction of the defect was shown successfully. The acoustic field of concrete specimens with a complex fracture were collected, which was calculated with symplectic geometry format migration imaging algorithm. Numerical simulation and experiments showed that, symplectic geometry format migration imaging algorithm can give the imaging results of structure containing a variety of defect without delay error.