岩土力学2024，Vol.45Issue(5)：1481-1494,14.DOI:10.16285/j.rsm.2023.0928
基于尺寸效应的夯土水盐运移分布特征研究
Distribution characteristics of water and salt transport in rammed earth sites based on size effect
摘要
Abstract
Water and salt cycling is a significant factor contributing to the gradual deterioration of rammed earth sites.To investigate the impact of size on the distribution characteristics of water and salt transport in rammed earth,five groups of cubic rammed earth samples with 0.3％salt content and varying side lengths(50,100,200,500 mm,and 900 mm)were prepared.These samples were subjected to a natural water loss test in an indoor environment with a temperature ranging from 10-27 ℃ and a relative humidity of 20％-50％.Throughout the water loss period,borehole sampling was conducted to measure the moisture content and salt distribution from the surface to the internal soil of the rammed earth samples.The analysis focused on the water and salt transport characteristics and the size effects of rammed earth of different sizes.The test results revealed that the water loss period and the salt enrichment of the surface soil increased with the size of the samples,while the water loss rate decreased with the sample size.The water loss period of rammed earth samples of different sizes was categorized into three stages:rapid water loss,slow water loss,and stable water loss,with water and salt transport predominantly occurring during the rapid water loss stage.Throughout the water loss process,salt was transported to the sample's surface layer along with the water,resulting in an increase in the salt content of the surface soil and a decrease in the internal soil's salt content.This led to the gradual concentration and enrichment of salt in the surface soil.This study provides valuable theoretical support for indoor small block experiments,full-size simulating experiments,and field observation experiments in rammed earth sites.关键词
夯土/水盐运移/失水/含盐量/含水率/周期/尺寸效应Key words
rammed earth site/water and salt transport/water loss/salt content/moisture content/period/size effect分类
建筑与水利引用本文复制引用
朱晶,裴强强,郭青林,张博..基于尺寸效应的夯土水盐运移分布特征研究[J].岩土力学,2024,45(5):1481-1494,14.基金项目
甘肃省文物保护科学和技术研究课题(No.GSWW202226) （No.GSWW202226）
敦煌研究院院级课题(No.2020-KJ-YB-10) （No.2020-KJ-YB-10）
酒泉市科技计划项目(No.2023CA1009).This work was supported by the Gansu Province Cultural Relics Protection Science and Technology Research Project(GSWW202226),the Dunhuang Academy Institute-level Project(2020-KJ-YB-10)and the Jiuquan City Science and Technology Plan Project(2023CA1009). （No.2023CA1009）
