超声CT技术在乾陵石刻风化状况调查中的应用

The use of CT scanning to survey the condition of stone sculptures at Qianling Mausoleum

内部裂隙发育是威胁石质艺术珍品长远保存的最具破坏作用的病害类型,了解石刻的裂隙发育情况,尤其是其在石刻内部的发育情况,对研究制订石刻的保护措施有很大的指导意义和参考价值。为此,本研究应用了近年来在国际上发展起来的一种先进的超声CT检测技术,对乾陵石刻内部裂隙发育进行了检测。本研究先通过实验室标准试块的检测研究:制作了直径约50cm的两个圆形及两个边长约50cm的石灰岩试样,并在试样上分别制作了直径5cm的圆孔5×15cm的方孔,使用ZBL-U520数字化非金属超声检测仪,用超声CT的方法对四个标准试样进行了检测,基本准确地检测到了缺陷的位置和大小。再利用超声CT的方法对乾陵石刻现场进行了检测,并与内窥镜检测结果对比,验证了超声CT结果的准确性。本研究结果将为乾陵石刻的保护修复提供可靠的依据。

Since interior cracks are the most important factor imperiling stone sculptures,it is necessary to understand the development of cracks inside such objects to make a conservation plan of action.Ultrasonic CT is a newly developed technique for assessing the weathering condition of stone.This article discusses the application of the ultrasonic CT scanning technique on weathering to assess the condition of stone sculptures at the Qianling Mausoleum.Limestone test sample blocks was prepared in the lab.Two round blocks with diameters of 50 cm and two rectangular samples with side lengths of 50 cm were made with 5cm diameter round holes and 5cm × 15 cm square holes,respectively.A ZBL-U520 digital CT scan was used to identify the holes.The CT scanner was used to test the interior cracks of Qianling Mausoleum sculptures and the results were compared with endoscopy results.The results by CT scan is proved to be accurate.