莫高窟壁画裂隙萌生特性试验研究

发布时间：2018-04-23 23:01

  本文选题：壁画地仗 + 裂隙萌生　； 参考：《岩土力学》2017年01期

【摘要】：敦煌莫高窟壁画长期受到外界微振动环境的影响,部分出现了裂隙病害,为此有必要深入开展壁画裂隙萌生特性的研究,为壁画的保护和修复工作提供科学依据和技术支持。针对莫高窟壁画地仗试件开展了四点弯曲抗拉试验,并利用数字图像相关技术实时测量了试件表面的全场应变变化与分布情况,分析了地仗在承受拉力破坏时裂隙萌生特性,给出了壁画所能承受的极限应变。同时,研究了试件缺陷、加载方式、疲劳次数等对试件的承载力与极限应变的影响。研究发现,莫高窟壁画裂隙萌生甚至一定程度的扩展并不会影响洞壁结构的承载力;壁画地仗的固有缺陷会导致壁画在缺陷处及其附近出现裂隙病害的风险加大;壁画地仗中添加的麻等纤维使其具有非常好的塑性和抗疲劳性能,只要在疲劳极限内就不会萌生裂隙。为了避免壁画产生裂隙病害,壁画地仗的最大正应变要严格控制在0.40%以内。
[Abstract]:The murals of Dunhuang Mogao Grottoes have long been affected by the external micro-vibration environment, and some of them have appeared crack diseases. Therefore, it is necessary to carry out the research on the characteristics of fresco crack initiation in order to provide scientific basis and technical support for the protection and restoration of the murals. A four-point bending tensile test was carried out for the specimen of Mogao Grottoes murals. The full-field strain change and distribution on the surface of the specimen were measured in real time by digital image correlation technique, and the crack initiation characteristics of the ground bar under tensile failure were analyzed. The limit strain that the mural can bear is given. At the same time, the effects of specimen defects, loading modes and fatigue times on the bearing capacity and ultimate strain of the specimens were studied. It is found that the crack initiation or even a certain degree of expansion of the murals in Mogao Grottoes will not affect the bearing capacity of the wall structure, and the inherent defects of the mural field will lead to the risk of the cracks occurring in and around the defects. The addition of hemp and other fibers in the mural field makes it have very good plasticity and fatigue resistance, so long as there is no crack within the fatigue limit. In order to avoid crack disease, the maximum normal strain of mural field should be controlled within 0.40%.
【作者单位】： 总参工程兵科研三所;中国船舶重工集团公司第七二五研究所;敦煌研究院;
【基金】：国家科技支撑计划课题(No.2013BAK01B01)~~
【分类号】：K879.41
，

本文编号：1794011