【摘要】 为了提高混凝土裂缝检测的能力,引进了在工程物探中应用广泛的叠加偏移成像技术,运用射线追踪方法来建立速度模型,研究了混凝土结构最短路径射线追踪方法。该方法采用两阶段射线追踪,第1阶段初选射线路径,第2阶段通过对初选射线路径进行校正分析来确定最终射线路径。对混凝土介质,可以从任意给定的初始路径出发进行逐段迭代计算,校正时,射线只是在一个网格内移动。最后用C++语言编制了程序,并输入了含有缺陷的二维速度模型来验证。结果表明,该方法追踪速度快,追踪到的路径很接近实际。在实际应用中,逐段迭代法的优势得到发挥,可以提高计算速度。更多还原

【Abstract】 In order to improve the concrete crack detection ability,with help of stack migration imaging technology which is widely used in geophysics and based on the speed model,the shortest path ray tracing method for concrete structure was studied.This method includes two stages:the first stage is to choose the primary ray path,and the second one is to confirm the final ray path by correcting the primary ray path.For concrete medium,segmental iterative operation can obtain refraction(reflection) amended point for any given initial ray path,and ray moves only within one gridding for correction.A program was compiled with C++ language,in which velocity planar model with vice was input to validate the method.The result indicates that,the tracing speed is fast and the path which is traced by this method is very close to reality;segmental iteration can fasten the computation speed in actual application.更多还原