工程地质学报2024，Vol.32Issue(3)：785-799,15.DOI:10.13544/j.cnki.jeg.2023-0454
淡水诱因干湿循环下超氯盐渍土强度演变
INFLUENCE OF FRESH WATER ON THE STRENGTH OF PERCHLORI-NATED SALINE SOIL UNDER DRY-WET CYCLES
摘要
Abstract
Mechanical and deformation properties of perchlorinated soil are complicated under dry-wet cycles caused by the climatic environment,which threatens the safety of superstructures.In order to simulate the strength evolution process of soil from construction to service,natural perchlorinated saline soil in Qarhan Salt Lake region was selected and three compactness of soil samples with compaction were prepared to do wetting-drying test.Dis-tilled water was added after each drying cycle to simulate the raining process.Unconfined compressive strength and shear strength were determined during dry-wet cycles.Microstructural changes during dry-wet cycles were observed to reveal the changing mechanism of soil mechanical properties.Experiments show that the unconfined compressive strength of soil samples is increased by 128.3％,138.9％,and 231.9％,and reaches the peak values at the 5 dry-wet cycles.Meanwhile,the cohesion c is also increased by 200.0％,215.7％,and 197.2％.When the soil sam-ples undergo 6～12 dry-wet cycles,the strength of the soil samples first decreases and then tends to be basically sta-ble.Microstructural observation indicates that the amount of bond materials among particles nearly shows the same change tendency with soil strength.Results indicate that the strength of perchlorinated soil increases at the early stage and then decreases with the increase of dry-wet cycles,which is mainly caused by the changes in microstruc-tures.More attention should be paid to the drainage of rainwater on the ground surface of perchlorinated soil after the construction process.关键词
超氯盐渍土/干湿循环/淡水入侵/强度演变/机理分析Key words
Perchlorinated saline soil/Dry-wet cycles/Freshwater intrusion/Strength evolution/Mechanism analysis引用本文复制引用
丁士君,李绍民,孔森,李秋阳,杨韬辉,聂治豹,赵高文..淡水诱因干湿循环下超氯盐渍土强度演变[J].工程地质学报,2024,32(3):785-799,15.基金项目
国家电网科技支持计划项目(资助号:52280721000A).This research is supported by the Research Project of China Electric Power Research Institute(Grant No.52280721000A). （资助号:52280721000A）
