SOIL WATER CONTENT AND DRY DENSITY BY TIME DOMAIN REFLECTOMETRY
SOIL WATER CONTENT AND DRY DENSITY BY TIME DOMAIN REFLECTOMETRY
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DOI：
10.1061/(asce)1090-0241(2004)130:9(922
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发表时间：
2004-09
影响因子：
3.9
通讯作者：
X. Yu;V. Drnevich
中科院分区：
文献类型：
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作者：
X. Yu;V. Drnevich
土壤含水量和干密度是压实质量控制的两个重要特性。本文提出了一种使用单时域反射计测试测定土壤含水量和干密度的新方法，该方法比 ASTM D6780 指定的方法有所改进。这种新方法基于对同一土壤样品同时测量表观介电常数和体电导率。校准方程将这两个参数与土壤重力含水量和干密度相关联，将现场测量的电导率调整为标准电导率后同时求解。该方法补偿了温度影响。测试过程大约需要3分钟，所有计算都是自动化的。测试可以使用提供足够采样体积的特殊探针在原位进行，或者在适合形成探针的压实模具中进行。实验室和现场测试结果表明，这种一步法是一种快速、准确、安全的施工质量控制方法。
Soil water content and dry density are two important properties for compaction quality control. This paper presents a new method for determining soil water content and dry density using a single time domain reflectometry test, which is an improvement over that designated by ASTM D6780. This new method is based on simultaneous measurement of apparent dielectric constant and bulk electrical conductivity on the same soil sample. Calibration equations correlate these two parameters with soil gravimetric water content and dry density, which are simultaneously solved after adjusting field-measured conductivity to a standard conductivity. The method compensates for temperature effects. The test process takes about 3 min and all calculations are automated. Testing may be done in situ using a special probe that provides sufficient sampling volume or in a compaction mold adapted to form a probe. Laboratory and field tests results show this one-step method is a fast, accurate, and safe method for construction quality control.