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原文传递 Enhancing the Erodibility of Cohesive Sediments by Applying Mechanical Vibrations

题名：	Enhancing the Erodibility of Cohesive Sediments by Applying Mechanical Vibrations
正文语种：	eng
作者：	Minxi Zhang;Wenkai Wang;Andrea La Rovere;Wenlong Zhu;Guoliang Yu
作者单位：	SKLOE CISSE School of Naval Architecture Ocean & Civil Engineering Shanghai Jiao Tong Univ. Shanghai 200240 China;China Waterborne Transport Research Institute Beijing 100088 China;AxFlow Via del Commercio 15 20090 Buccinasco MI Italy;SKLOE CISSE School of Naval Architecture Ocean & Civil Engineering Shanghai Jiao Tong Univ. Shanghai 200240 China;SKLOE CISSE School of Naval Architecture Ocean & Civil Engineering Shanghai Jiao Tong Univ. Shanghai 200240 China
关键词：	Cohesive sediments; Erodibility; Mechanical vibration; Fluidization; Enhancement; Sediment rheology
摘要：	The efficiency of dredging, whether with a cutter suction dredger or hydraulic flushing, is closely related to the erodibility of the sediments. It is found that the erodibility of cohesive sediments, which is affected by their rheological properties, could be enhanced by improving their fluidization quality. In this study, a cohesive sediment fluidization and erosion enhancing (CSFEE) device was used to fluidize the sediments during flushing, and the corresponding scour rates of test sediments were investigated. The results indicated that this device, with the combined effects of vibration and air, can significantly enhance the erodibility of cohesive sediments in both the directly and indirectly vibrated areas and that this enhancement is more significant for the sediments with higher initial yield stress. The fluidization of the sediments by mechanical vibration is the key driver for such enhancement. Due to the thixotropy of cohesive sediments, the effects of vibration were time-dependent, whereby the scour rate of test sediments increased with increasing exposure time of the device.
出版年：	2021
期刊名称：	Journal of Waterway, Port, Coastal and Ocean Engineering
卷：	147
期：	3