西南交通大学学报2025，Vol.60Issue(3)：639-647,9.DOI:10.3969/j.issn.0258-2724.20230639
FDR联合静力贯入快速测土体质量含水率和干密度试验研究
Experimental Study on Rapid Determination of Soil Gravimetric Water Content and Dry Density Based on Frequency Domain Reflectometry Combined with Static Penetration
摘要
Abstract
To overcome the labor-intensive and time-consuming limitations of conventional methods for determining soil gravimetric water content(w)and dry density(ρd),a rapid determination method integrating frequency domain reflectometry(FDR)and static penetration was developed.Parameter calibration tests were conducted to establish a second-order response surface model describing the relationships between dielectric constant,electrical conductivity,and penetration resistance with respect to w and ρd,along with the introduction of a conductivity correction model.Systematic validation was subsequently performed on the applicability and advantages of this method through preliminary verification tests,laboratory model tests,and inversion calculations utilizing particle swarm optimization.The results indicate that the second-order response surface model effectively captures the complex multivariate relationships between soil dielectric constant,electrical conductivity,and penetration resistance with respect to w and ρd,with correlation coefficients exceeding 0.950.The integration of penetration resistance measurements into the FDR method effectively mitigates issues of non-unique inversion solutions and anomalies associated with measuring only dielectric constant and electrical conductivity,reducing the root mean square errors for w and ρd from 3.838 and 0.143 to 0.853 and 0.069,respectively.Compared to the traditional FDR method,the proposed method significantly improves detection accuracy,with maximum errors forwandρd limited within[-1.5%,1.5%]and[-0.1,0.1]g/cm3,respectively.关键词
频域反射法/静力贯入/质量含水率/干密度/响应曲面法/粒子群优化算法Key words
FDR/static penetration/gravimetric water content/dry density/response surface method/particle swarm optimization分类
建筑与水利引用本文复制引用
臧耀辉,王柳江,毛航宇,刘彪,刘斯宏,傅中志..FDR联合静力贯入快速测土体质量含水率和干密度试验研究[J].西南交通大学学报,2025,60(3):639-647,9.基金项目
国家重点研发计划(2022YFE0105000) （2022YFE0105000）
国家自然科学基金项目(52222906,52209160,U21A20158) （52222906,52209160,U21A20158）
