不同泥敷剂配比下土遗址泥敷法脱盐效果评价  

An Evaluation of the Effectiveness of Salt Extraction by Poulticing at Earthen Sites Based Ratios of Desalination Materials

作　　者：李凤洁[1] 王旭东[1,2] 杨善龙[2,3] 郭青林 林波[1] 张博[1] 

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000 [2]国家古代壁画与土遗址保护工程技术研究中心,甘肃敦煌736200 [3]西北大学文化遗产学院,陕西西安710069

出　　处：《敦煌研究》2015年第6期107-113,共7页Dunhuang Research

基　　金：国家科技支撑计划课题"干旱环境下土遗址保护成套技术集成与应用示范"(2014BAK16B02)

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。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 is transported to the interior of the soil samples during the salt extraction process.

关 键 词：土遗址 泥敷脱盐 盐分运移 

分 类 号：K878[历史地理—考古学及博物馆学]