摘要
建立土体含水率和干密度与电磁参数间的经验模型是TDR技术在岩土工程中应用的关键。在原一步法模型基础上,分别建立了土体含水率、干密度与土体介电常数等电磁参数间新的经验关系模型,实现了干密度和含水率的解耦计算。分析了击实功、孔隙水电导率、温度等因素对新经验公式的影响。通过标定后,新经验公式计算的干密度相对偏差在±5%以内,含水率偏差在±0.02 g.g^(-1)以内。同时,提出了一种TDR自适应方法,可在现场无标定条件下实现土体干密度和含水率的快速高效测定。
The key of using the technology of time domain reflectometry（TDR） is to establish the empirical equation for the relationship among electromagnetic parameters, water content and dry density. Based on the one-step method, two empirical equations are established for the content, dry density, apparent dielectric constant and drop volt parameter, which can calculate the water content and dry density respectively. Then the influence laws of compaction energy, pore fluid conductivity and temperature on the calculated results by the new equations are analyzed. After calibration, the relative error of dry density is within ±5%, and the error of water content is within±0.02 g.g^（-1）. Meanwhile, an adaptive method is proposed to test the water content and dry density by using the TDR method conveniently and efficiently in the field tests in which the calibration tests may not be comducted.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2016年第5期818-827,共10页
Chinese Journal of Geotechnical Engineering
基金
国家重点基础研究发展计划(“973”计划)项目(2014CB047005)
关键词
干密度
含水率
经验公式
TDR
自适应
dry density
water content
empirical equation
TDR
adaptive system
