不同泥敷剂配比下土遗址泥敷法脱盐效果评价-《敦煌研究》(2015年6期).docx

龙源版权所有 不同泥敷剂配比下土遗址泥敷法脱盐效果评价作者：李凤洁 王旭东 杨善龙 郭青林 林波 张博来源：《敦煌研究》2015年第06期 内容摘要：现今，土遗址盐害是危害土遗址保存的主要因素之一，土遗址泥敷法脱盐技术已进行了室内试验研究，筛选出一系列泥敷剂材料。文章以已筛选出的泥敷剂材料为基础，进一步研究了在相同泥敷剂材料种类的情况下，应用不同配比，不同含水量的泥敷剂对含盐土体试样进行脱盐后，土体试样一定深度范围内盐分含量变化，并进行脱盐效果评价。研究结果表明：泥敷剂中含水量较少，则试样中脱盐的作用深度也较浅;含水量过高，虽然能够调动土体内较多盐分，但会导致试样一定深度范围内的盐分积聚，对土体结构带来的危害较大。此外，脱盐后所有试样较深范围内的含盐量较脱盐之前均有所升高，但升高幅度不大，说明脱盐过程中有少量盐分向试样内部运移。 关键词：土遗址;泥敷脱盐;盐分运移 中图分类号：TU41 文献标识码：A 文章编号：1000-4106（2015）06-0107-07 An Evaluation of the Effectiveness of Salt Extraction by Poulticing at Earthen Sites Based Ratios of Desalination Materials LI Fengjie1 WANG Xudong1，2 YANG Shanlong2，3 GUO Qinglin2 LIN Bo1 ZHANG Bo1 （1. Key Laboratory of Western China Mechanics of Disaster and Environment of the Ministry of Education， Lanzhou University， Lanzhou， Gansu 730000; 2. National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites， Dunhuang， Gansu 736200; 3. College of Cultural Heritage， Northwest University， Xi’an， Shaanxi 710069） Abstract： Today， salt damage is one of the factors harmful to the preservation of earthen archaeological sites. Lab experiments have been done to study the poulticing technology involved in salt extraction and to choose various desalination materials. Based on the selected desalination materials， this study further researches the salinity contents at different depths of the same soil samples after extracting salt by poulticing with different ratios and moisture contents， and then evaluates the effectiveness of salt extraction. The research results show that salt extraction only works at shallower levels of soil where there is less water in the poulticing. Although more water in poulticing can remove more salt from the soil samples， it might also lead to salt accumulation at certain depths and damage the soil structure. In addition， the salinity contents at deeper areas after salt extraction are higher than before salt extraction， though very slightly. This suggests that a small amount of salt i