Settling behavior of clay suspensions produced by dredging activities in China

Zeng, Lanting; Zhang, Hong; Tian, Wenbin; Shi, Junwei

doi:10.1080/1064119x.2016.1274808

Cited by 21 publications

(3 citation statements)

References 14 publications

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“…Dredging activities have signi cantly increased with the booming economy in recent years (e.g., land reclamation, channel dredging, river and lake management) (e.g., Cai et al, 2017;Zeng et al, 2018;Wan et al, 2022). Dredging is the typically hydraulic method by mixing natural sediments deposited at the beds of sea, river and lake with a large amount of water in China (e.g., Shi and Yin, 2018;Shi et al, 2021;Gao et al, 2023;Zeng et al,2023).…”

Section: Introductionmentioning

confidence: 99%

Crack development in dredged sediment due to the deformation of vertical drains under intermittent vacuum preloading

Cao,

Xu,

Gao

et al. 2024

Preprint

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The intermittent vacuum preloading in combination with the deformable drainage system method exhibited excellent performance in treating dredged sediment. The contraction and expansion of vertical drainage system caused the formation of cracks on the surface soil. To reveal the mechanisms of crack development, laboratory model box tests were conducted on dredged sediment with different initial water contents (w0) under various expansion strains of vertical drainage system (ε). The study investigated the crack development patterns (e.g., crack number, crack length, maximum crack width, and crack area) on surface soil near the drainage system. The results indicated that the expansion of drainage systems gradually resulted in a radial distribution of soil cracks. The threshold strain values of vertical drainage systems corresponding to the initiation of soil cracks gradually increased, with the increase of w0. The total crack length, total crack area and maximum crack width exhibited a decreasing trend as the w0 increased. This study also identified a critical w0 (w0 < water content at liquid limit) for the formation of cracks on the surface soil. The crack development patterns on the surface soil could be divided into two stages: the slow development stage (ε ≤ 10.0%) and the rapid development stage (ε > 10.0%). The cracks could potentially increase the drainage area, which further enhanced the treatment effect of dredged sediment with high water content.

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Section: Introductionmentioning

confidence: 99%

Crack development in dredged sediment due to the deformation of vertical drains under intermittent vacuum preloading

Cao,

Xu,

Gao

et al. 2024

Preprint

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“…Globally, several hundred million cubic meters of marine mud slurries with poor engineering characteristics are inevitably produced. For the massive quantities and negative impacts of dredged mud slurry, its disposal and utilization have become one of the most noticeable issues in the world [2][3][4][5][6][7]. Traditional solutions, such as inland deposits and ocean dumping, are increasingly unpopular for their deleterious influence on surroundings [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of Marine Mud Slurry Treated by Flocculation-Solidification-High Pressure Filtration Combined Method

Han,

Xie,

Bai

et al. 2023

JMSE

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For the massive quantities and negative impacts of dredged mud slurry, its disposal and utilization have become one of the most noticeable issues in the world. In this paper, the flocculation-solidification-high pressure filtration combined method is proposed to effectively dispose of marine mud slurries. The advantages of this method are demonstrated herein in the following three aspects: dewatering performance, material savings, and the shear strength of the treated marine mud slurry. Then, the effects of the anionic polyacrylamide (APAM) dose, composite solidification agent dose, initial water content of marine mud slurries, and initial thickness of geo-bags on the mechanical properties of the marine mud slurry treated by the flocculation-solidification-high pressure filtration combined method are studied. Experimental results show that with increasing doses of APAM, the structures of mud slurries become more stable, and the optimal dose of APAM is determined as 0.16%. Moreover, the increase in the composite solidification agent dose and initial water content of the marine mud slurry, and the decrease in the initial thickness of geo-bags both contribute to the increase in the shear strength of the marine mud slurry treated by the flocculation-solidification-high pressure filtration combined method.

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“…Birkaç gün ya da birkaç hafta içerisinde sedimentasyon tamamlandıktan sonra efektif gerilmenin oluşmaya başlaması ile kendi ağırlığında konsolidasyon aşamasına geçilir [1,2]. Yüksek su muhtevasına sahip yumuşak killerin sedimantasyonu, kendi ağırlığı altında konsolidasyonu ve etkileyen faktörleri incelemek için birçok teorik ve deneysel araştırmalar yapılmıştır [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]. Yüksek su muhtevasına sahip bu zeminlerin konsolidasyon davranışının incelenmesinde çok küçük gerilme seviyelerindeki boşluk oranı-efektif gerilme ve boşluk oranı-permeabilite değişimlerinin dikkate alınması gereklidir [21,22,23,24,25].…”

Section: Introductionunclassified

Depolanmış Tarama Çamurlarının Sıkışabilirlik ve Mukavemet Davranışının Laboratuvar ve Arazi Deneyleri ile İncelenmesi

2021

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Bu çalışmada, Haliç tarama çamurunun karada depolanması durumunda, kendi ağırlığı altında ve sürşarj yükleri etkisindeki sıkışabilirlik ve mukavemet davranışı incelenmiştir. Bu amaçla, taranan çamurun karada depolanması durumunda kendi ağırlığı altında konsolidasyon davranışını incelemek için laboratuvarda dört adet büyük boyutlu model deney ve bir adet küçük boyutlu sedimantasyon deneyi gerçekleştirilmiştir. Bu deneylerde kendi ağırlığı altında konsolidasyondan sonra alınan örselenmemiş numuneler üzerinde yapılan ödometre deneyleri ile sürşarj yükleri etkisindeki sıkışabilirlik ve model deneylerde yapılan veyn deneyi ile derinlik boyunca drenajsız kayma mukavemeti ölçülmüştür. Zeminin kendi ağırlığı altındaki konsolidasyon davranışını incelemek için gerçekleştirilen model deneyler ve sedimentasyon deneyinden ölçülen oturma değerlerinden konsolidasyon katsayısı c v 'nin 0.91-10.72 m 2 /yıl aralığında ve drenajsız kayma mukavemetinin de 4-20 kPa arasında değiştiği belirlenmiştir. Tarama çamurunun karada depolanmasından 13 yıl sonra yapılan arazi deneylerinden belirlenen drenajsız kayma mukavemeti (SPT N darbe sayısına bağlı olarak ve UU deneylerinden) benzer şekilde c u =4-20 kPa arasında değişim göstermiştir. Haliç'ten taranan ve eski taş ocağında depolanan yaklaşık 25 m kalınlıktaki tarama çamurunun düşük taşıma gücüne ve yüksek sıkışabilirliğe sahip olduğu tespit edilmiştir.

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Settling behavior of clay suspensions produced by dredging activities in China

Cited by 21 publications

References 14 publications

Crack development in dredged sediment due to the deformation of vertical drains under intermittent vacuum preloading

Crack development in dredged sediment due to the deformation of vertical drains under intermittent vacuum preloading

Experimental Study on Mechanical Properties of Marine Mud Slurry Treated by Flocculation-Solidification-High Pressure Filtration Combined Method

Depolanmış Tarama Çamurlarının Sıkışabilirlik ve Mukavemet Davranışının Laboratuvar ve Arazi Deneyleri ile İncelenmesi

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