本文選題：壁畫地仗 + 裂隙萌生　； 參考：《巖土力學(xué)》2017年01期

【摘要】：敦煌莫高窟壁畫長(zhǎng)期受到外界微振動(dòng)環(huán)境的影響,部分出現(xiàn)了裂隙病害,為此有必要深入開(kāi)展壁畫裂隙萌生特性的研究,為壁畫的保護(hù)和修復(fù)工作提供科學(xué)依據(jù)和技術(shù)支持。針對(duì)莫高窟壁畫地仗試件開(kāi)展了四點(diǎn)彎曲抗拉試驗(yàn),并利用數(shù)字圖像相關(guān)技術(shù)實(shí)時(shí)測(cè)量了試件表面的全場(chǎng)應(yīng)變變化與分布情況,分析了地仗在承受拉力破壞時(shí)裂隙萌生特性,給出了壁畫所能承受的極限應(yīng)變。同時(shí),研究了試件缺陷、加載方式、疲勞次數(shù)等對(duì)試件的承載力與極限應(yīng)變的影響。研究發(fā)現(xiàn),莫高窟壁畫裂隙萌生甚至一定程度的擴(kuò)展并不會(huì)影響洞壁結(jié)構(gòu)的承載力;壁畫地仗的固有缺陷會(huì)導(dǎo)致壁畫在缺陷處及其附近出現(xiàn)裂隙病害的風(fēng)險(xiǎn)加大;壁畫地仗中添加的麻等纖維使其具有非常好的塑性和抗疲勞性能,只要在疲勞極限內(nèi)就不會(huì)萌生裂隙。為了避免壁畫產(chǎn)生裂隙病害,壁畫地仗的最大正應(yīng)變要嚴(yán)格控制在0.40%以內(nèi)。
[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%.
【作者單位】： 總參工程兵科研三所;中國(guó)船舶重工集團(tuán)公司第七二五研究所;敦煌研究院;
【基金】：國(guó)家科技支撐計(jì)劃課題(No.2013BAK01B01)~~
【分類號(hào)】：K879.41
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本文編號(hào)：1794011