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| Experimental study of soil model and test error of electronic density gauge |
| ZHENG Jianguo1，2，YANG Qunfang1，2，LIU Zhenghong1，2，YU Yongtang1，2，DU Weifei1，2，CHEN Xiaosan1 |
(1. China JK Institute of Engineering Investigation and Design Co.，Ltd.，Xi?an，Shaanxi 710043，China；
2. Shaanxi Key Laboratory of Engineering Behavior and Foundation Treatment for Special Soil，Xi?an，Shaanxi 710043，China) |
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Abstract Electronic density gauge(EDG) is a test instrument which could determine the dry density quickly and nondestructively. However the domestic application experience is rare. The measured results of loess with good homogeneity using the sand cone method，the oven-drying method and EDG were analyzed and the reasons causing the errors in EDG were found，so that the accuracy and the applicability of EDG in determining the dry density were determined. The impedance and the ratio of the capacitance over the resistance were all influenced by the density and the volumetric moisture，which was found to be the main reason causing the measurement error of EDG. The error varied with the dry density and water content. The error was smaller when the dry density and water content of the sample were within a particular range. Outside the range，the error was larger. Keeping the soil uniformity and moisture content changing within a small range are the premise of guaranteeing the accuracy of EDG measurement. It is necessary to analyze the error distribution of the soil model used in practice，and to confirm the application scope of dry density and water content to ensure a small error.
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2016, Vol. 35 
