工程地质学报2024，Vol.32Issue(1)：120-132,13.DOI:10.13544/j.cnki.jeg.2022-0510
砂岩质文物内部毛细水运移过程微电极响应特征
MICROELECTRODE RESPONSE CHARACTERISTICS OF CAPILLARY WATER MIGRATION IN SANDSTONE CULTURAL RELICS
摘要
Abstract
Salt crystallization is one of the most common issues affecting sandstone cultural relics,directly impac-ting their integrity through the capillary migration of soluble salt solutions.To gain a deeper understanding of capil-lary water migration in sandstone relics under various influences,we designed independent capillary water absorp-tion and microelectrode resistivity test devices based on the sandstones of Dazu Rock Carvings.We then conducted a quantitative analysis of the influence of pore structures,pore solutions,dry-wet cycles,and relative humidity on capillary water migration and electrical resistivity distribution characteristics.The results demonstrate that a loose microstructure and low relative humidity promote capillary water transport.Capillary migration is notably influenced by the surface tension of the soluble salt solution,with water absorption and migration rates increasing with surface tension.Dry-wet cycles lead to the expansion of internal pores,accelerating the capillary migration rate.Additional-ly,there is a negative correlation between the saturation of the sample and the resistivity of the sandstone.The pres-ence of soluble salts significantly reduces the resistivity of the sandstone.The apparent resistivity of the wetting front of the sample approximately coincides with the salt crystallization deterioration area on the sample surface,revealing temporal and spatial distribution characteristics of resistivity.Moreover,the wetting front exhibits a concave trend a-long the depth direction.These results unveil the laws governing capillary water migration in sandstone relics,provi-ding theoretical support for accurately tracking the range of salt damage.关键词
砂岩质文物/毛细水运移/可溶盐/电阻率测试/大足石刻Key words
Sandstone relics/Capillary water migration/Soluble salt/Resistivity test/Dazu Rock Carvings分类
建筑与水利引用本文复制引用
杨海清,陈池威,赵岗,周家源..砂岩质文物内部毛细水运移过程微电极响应特征[J].工程地质学报,2024,32(1):120-132,13.基金项目
国家自然科学基金项目(资助号:52179096),重庆市自然科学基金(资助号:cstc2021jcyj-msxmX0903).This research is supported by the National Nature Science Foundation of China(Grant No.52179096)and the Natural Sciences Fund of Chongqing(Grant No.cstc2021jcyj-msxmX0903). （资助号:52179096）
