IN-SITU MONITORING OF SEABED SEDIMENTS CONSOLIDATION PROCESS IN YELLOW RIVER ESTUARY BY ELECTRICAL RESISTIVITY METHOD
电阻率法监测黄河口海床沉积物固结过程现场试验研究

In order to study the correlations between resistivity and mechanical properties of the seabed sediments during the consolidation process in the Yellow River estuary, and to explore a new in-situ monitoring technique for the process, a series of experiments were conducted on the tidal flat of Diaokou delta-lobe that lies in the north of the Yellow River Delta. The fluid sediments imitating the rapidly depositing seabed silts were taken in situ, and the fluid sediments were promptly filled into a one-meter deep pit excavated on the tidal flat. Using field-testing methods, including static cone penetration test, field vaneshear test and pore water piezometer test, variations in mechanical strength and dissipation of pore water pressure were measured in real time. A homemade monitoring probe with ring electrodes was alsoburied in the sediments to measure the real-time resistiv-ity during the sediment consolidation process. Based on the experimental data, good power correlations were found between re-sistivity and penetration strength, specific penetration resistance and undrained shear strength (includingpeak strength and re-sidual shear strength) of the saturated silty soil in the Yellow River ESTUARINE area. There was a negative linear correlation between resistivity and pore water pressure. We propose that resistivity method can be used as an effective way to obtain the degree of consolidation of the silty soil in the Yellow River estuarine area.