探地雷达测定地基土含水量的实验研究

利用室内模型槽，采用探地雷达开展了测定地基土含水量的室内实验研究。通过对探地雷达反射波法测定的介电常数和烘干法测定的含水量之间的曲线拟合，提出了实验用粉土的含水量与介电常数之间的经验公式。与实测含水量的对比分析表明，Topp公式在一定含水量范围内有良好的适用性，而本文提出的经验公式较Topp公式具有更宽的含水量适用范围和更高的预测精度；针对不同类型土建立相应的含水量和介电常数之间的经验公式是必要的，将有助于提高探地雷达测定地基土含水量的精度。

ESTIMATION OF SOIL WATER CONTENT |USING GROUND PENETRATING RADAR

Uses a reflected wave method and an oven dry method to estimate soil water content.  Experimental study is carried out. The reflected wave method is based on the ground penetration radar technique.  The empirical equation of experimental silt is obtained  via curve fitting of soil water content  versus dielectric constant. Comparative analysis shows that the classical Topp formula has  a good serviceability in certain water content rang. An empirical formula is proposed in this paper.  It has a wider range of estimating soil water content and a higher estimate accuracy than the classical Topp formula. This study indicates that the empirical formula is necessary for different types of soils and will help to improve the accuracy of estimation of soil water content  with ground penetrating radar technique.