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LIU Jie, FENG Xiuli, LIU Xiao. Sediment consolidation settlement of Chengbei Sea area in the northern Huanghe River subaqueous delta, China[J]. Journal of Oceanology and Limnology, 2017, 35(3): 693-703

Sediment consolidation settlement of Chengbei Sea area in the northern Huanghe River subaqueous delta, China

LIU Jie1,2, FENG Xiuli2,3, LIU Xiao2,4
1 Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration (SOA), Qingdao 266061, China;
2 Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;
3 Key Lab of Submarine Geosciences and Prospecting Techniques, Ocean University of China, Qingdao 266100, China;
4 College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
One of the most important factors controlling the morphology of the modern Huanghe (Yellow) River delta is consolidation settlement, which is impacted by fast deposition, high water content, and low density of seafloor sediment. Consolidation settlement of the Huanghe River subaqueous delta was studied based on field data, laboratory experiments on 12 drill holes, and the one-dimensional consolidation theory. Results show that vertical sediment characteristics varied greatly in the rapidly forming sedimentary bodies of the modern Huanghe River subaqueous delta. Sediments in the upper parts of drill holes were coarser than those in the deeper parts, and other physical and mechanical properties changed accordingly. On the basis of the one-dimensional consolidation theory and drilling depth, the final consolidation settlement of drill holes was between 0.6 m and 2.8 m, and the mean settlement of unit depth was at 1.5–3.5 cm/m. It takes about 15–20 years for the consolidation degree to reach 90% and the average sedimentation rate within the overlying 50 m strata was at 5 cm/a to 12 cm/a. This study helps to forecast the final consolidation settlement and settlement rate of the modern Huanghe River subaqueous delta, which provides key geotechnical information for marine engineers.
Key words:    mechanical properties|consolidation settlement|drill hole|modern Huanghe River subaqueous delta   
Received: 2015-12-30   Revised: 2016-02-23
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