The co-relationship of conductivity and geotechnical parameters of Yaodi dike of Hanjiang River

摘要

Detection of hidden defects and leakage is one of the important works of flood control. In recent years, many researchers have pointed out that electromagnetic and electrical method are more effective techniques in geophysical methods for detecting and locating hidden defects and leakage in dikes. However, The above techniques can only show people the electrical conductivity (or resistivity) of the dikes to be tested, the deduction of defects existing can be made indirectly via analyzing the abnormal area of electrical conductivity profiles. But, the geo-technical parameters of dikes can't be known. Our work tried to find out the co-relationship of the electrical conductivity and the geo-technical parameters of dikes by direct measuring the conductivity and the geo-technical parameters of samples such as clay content, silt content, moisture, dry density, porosity, gradation, and soil composition, etc. The co-relationship is a basic theoretical and experimental reference data for correct analysis of the geophysical testing results and evaluation of dike safety. The research shows that the conductivity has direct co-relation with clay content, moisture, and porosity, and reverse co-relation with dry density. It seems that the electrical conductivity of soil has no obvious relation with silt content.