Rheological characteristics and its influencing factors of dense cohesive sediments in the Huanghe River subaqueous delta

Liu Xiaolei; Chen Anduo; Zhang Hong; Lu Yang; Ma Lukuan; Jia Yonggang

doi:10.12284/hyxb2021083

Volume 43 Issue 5

May 2021

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Liu Xiaolei，Chen Anduo，Zhang Hong, et al. Rheological characteristics and its influencing factors of dense cohesive sediments in the Huanghe River subaqueous delta[J]. Haiyang Xuebao，2021, 43(5)：127–134 doi: 10.12284/hyxb2021083

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Rheological characteristics and its influencing factors of dense cohesive sediments in the Huanghe River subaqueous delta

doi: 10.12284/hyxb2021083

1.
Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
2.
Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China

Received Date: 2020-04-08
Rev Recd Date: 2020-06-02

Available Online: 2021-03-30

Publish Date: 2021-07-06

Abstract

Abstract

Cohesive sediments are widely distributed in the subaqueous delta of the Huanghe River and can easily cause problems such as sedimentation, erosion and sea-bed fluidization under the action of external load, which poses a great threat to the engineering facilities such as ports, waterways and submarine pipelines. Samples of cohesive sediment with different consolidation times and different water contents were prepared by using the undisturbed cohesive sediment taken from the fluid mud development area of the Huanghe River subaqueous delta. The rheological tests were carried out under the mode of full shear rate with R/S rheometer to analyze the rheological characteristics of cohesive sediment in the Huanghe River subaqueous delta and the effects of water content and consolidation time on the rheological characteristics. The results show that the cohesive sediment flows and becomes unstable under the shear load, and the phase changes. The yield stress increased by 35% after being consolidated for 120 min. The shear thickening behavior of the cohesive sediment with 50% water content at a high shear rate was more obvious with the increase of water content. Power model is applicable to the rheological behavior of the cohesive sediment with a water content greater than 50% at high shear rate. This study can provide a reference for the numerical simulation of subaqueous cohesive sediment and the prediction of subaqueous gravity flow.
- Huanghe River subaqueous delta,
- dense cohesive sediments,
- rheological characteristics,
- influencing factors,
- rheological test

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References

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