工程地质学报2026，Vol.34Issue(2)：846-856,11.DOI:10.13544/j.cnki.jeg.2022-0836
疏水土阻水性能及评价方法研究
WATER-RESISTING ABILITY AND EVALUATION METHOD OF HYDRO-PHOBIC SOIL
摘要
Abstract
Water infiltration and migration in soils are major contributors to geotechnical engineering hazards such as roadbed frost heave and slope instability.As a novel material with excellent performance characteristics,hydrophobic soil offers a promising approach to addressing these issues.To evaluate the water-resisting capacity of hydrophobic soil,this study prepared a hydrophobic soil using Qinghai silty clay and a new hydrophobic additive.A series of experiments—including water droplet penetration tests,immersion tests,breakthrough pressure tests,and nuclear magnetic resonance(NMR)tests—were conducted to systematically investigate the wetting properties,breakthrough pressure,long-term stability,and pore water distribution characteristics of the material.The results indicate that:(1)The water repellency of hydrophobic soil increases with both additive content and compaction degree.The optimal hydrophobic additive content for Qinghai silty clay is 15.5％.(2)Under long-term immersion,the water content-time relationship of hydrophobic soil follows a power function.The infiltration rate gradually decreases and approaches zero,with the final saturation degree stabilizing at approximately 0.2.(3)At the optimal additive content of 15.5％and compaction degree of 0.95,the breakthrough pressure of hydrophobic soil is about 40 kPa.Breakthrough pressure is negatively correlated with pore size and positively correlated with contact angle.(4)After long-term immersion,the pore water content of hydrophobic soil is about 80％lower than that of ordinary soil.Pore water in hydrophobic soil consists mainly of capillary water,accompanied by adsorbed water,distributed in two pore size ranges:0.01～0.1 μm and 1～4 μm,respectively.This study provides a reference for evaluating the water-resisting performance and supporting the engineering application of hydrophobic soils.关键词
疏水土/阻水性能/突破压力/孔隙水分布/湿润性Key words
Hydrophobic soil/Water-resisting ability/Breakthrough pressure/Pore water distribution/Wettability分类
天文与地球科学引用本文复制引用
石硕,李旭,吴永康,林宏杰..疏水土阻水性能及评价方法研究[J].工程地质学报,2026,34(2):846-856,11.基金项目
北京交通大学人才基金项目(资助号:2024XKRC006,2022XKRC005),北京市自然科学基金资助(资助号:8222028).This research is supported by the Talent Fund of Beijing Jiaotong University(Grant Nos.2024XKRC006,2022XKRC005)and Beijing Natural Sci-ence Foundation(Grant No.8222028). （资助号:2024XKRC006,2022XKRC005）
