改进一步法模型及TDR自适应方法研究

发布时间：2018-01-13 18:27

本文关键词：改进一步法模型及TDR自适应方法研究　出处：《岩土工程学报》2016年05期 　论文类型：期刊论文

【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。
[Abstract]:Establishing the empirical model between soil moisture content and dry density and electromagnetic parameters is the key to the application of TDR technology in geotechnical engineering. Based on the original one-step model, the soil moisture content is established respectively. A new empirical relationship model between dry density and electromagnetic parameters such as dielectric constant of soil is developed to realize the decoupling calculation of dry density and moisture content, and the compaction work and pore water conductivity are analyzed. The effect of temperature and other factors on the new empirical formula. After calibration, the relative deviation of dry density calculated by the new empirical formula is within 卤5%, and the deviation of moisture content is less than 卤0.02g / g / g ~ (-1). An adaptive TDR method is proposed to measure dry density and moisture content of soil without calibration in the field.
【作者单位】：软弱土与环境土工教育部重点实验室(浙江大学);浙江大学岩土工程研究所;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2014CB047005)
【分类号】：TU43
【正文快照】： 0引言含水率和干密度是评价路基、堤坝、边坡等土体工程性质的重要参数,高效测试土体的含水率和干密度在岩土工程中具有重要意义。电磁波时域反射法(time domain reflectometry,TDR)利用水的介电常数远大于土固体颗粒和空气这一特点,通过测试土体的电磁参数确定土体含水率和干

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