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渤海湾海洋疏浚泥的药剂絮凝与固结特性 被引量:2

Flocculation and consolidation characteristics of marine dredged slurry from Bohai Bay
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摘要 海洋疏浚泥一般具有颗粒细、含水率高、渗透性差等特点,药剂真空预压法能够大幅提高海洋疏浚的加固效果,但是,目前关于渤海湾海洋疏浚泥的药剂絮凝与固结特性不甚清楚。为此,基于东营吹填土的矿物成分与物理性质,对经过CaO与APAM两种絮凝药剂预处理后海洋吹填土的絮凝特性与固结特性进行研究。研究结果表明:该地区疏浚泥为淤泥质粉质黏土,矿物成分以石英、碳酸钙为主,且含有一定量的白云母、绿泥石等黏土矿物;加入有机絮凝剂APAM后絮凝速率非常快,添加量在100~300 g/m^(3)范围内,只需约5 min即可完成固液分离,并能排出大量的上清液,最终上清液的体积比不加絮凝剂的将增加1/4~1/3;无机絮凝剂CaO的加入同样能加快固液分离,但是上清液的体积比不添加絮凝剂的少,这一点与有机絮凝剂完全不同;加入絮凝剂后疏浚泥的固结系数均会有不同程度的增加:有机絮凝剂添加量越多固结系数越大;无机絮凝剂则不同,随着添加量的增加,固结系数呈先增加后减小的变化规律。为了取得最佳的固结效果,应该采用最优添加量。研究成果对于渤海湾海洋疏浚泥的药剂真空预压处理工程实践具有理论指导意义。 Marine dredged slurry generally features fine particles, high moisture content, and poor permeability. The flocculant vacuum preloading method can increase the reinforcement effect of marine dredging significantly. However, at present, the flocculation and consolidation characteristics of marine dredged slurry in Bohai Bay are unclear. This paper investigates the flocculation and consolidation characteristics of marine dredged slurry after pre-treatment with CaO and APAM based on the mineral composition and physical properties of the Dongying reclamation soil. The results show that the dredged slurry in the area is silty and clay, with quartz and calcium carbonate as the primary mineral components and some clay minerals such as muscovite and chlorite. The flocculation rate is speedy after adding organic flocculant APAM with an amount between 100 and 300 g/m^(3). It only takes about 5 minutes to complete the solid-liquid separation and discharge an extensive amount of supernatant. The volume of the final supernatant increases by 1/4-1/3 compared with that without flocculant. The addition of inorganic flocculant CaO also speeds up solid-liquid separation. However, the volume of supernatant is less than that without adding flocculant, which differs entirely from the organic flocculant. The consolidation coefficient of the dredged slurry will increase to different degrees after adding flocculants: The consolidation coefficient rises as the organic flocculants are constantly added to the dredged slurry. However, the inorganic flocculants are different:The consolidation coefficient increases first and then decreases with the increase in the added amount. The optimal added amount should be adopted to get the best consolidation effect. The research results are of great theoretical significance for vacuum preloading treatment of marine dredged slurry in Bohai Bay.
作者 李运红 戚庆学 王彦军 武亚军 陈国公 许嘉乐 LI Yun-hong;QI Qing-xue;WANG Yan-jun;WU Ya-jun;CHEN Guo-gong;XU Jia-le(Qingdao Geological Exploration Institute of China Metallurgical Geology Bureau,Qingdao 266109,China;Department of Civil Engineering,ShanghaiUniversity,Shanghai 200444,China)
出处 《水运工程》 北大核心 2022年第3期1-6,共6页 Port & Waterway Engineering
基金 国家自然科学基金项目(41772303)。
关键词 海洋疏浚泥 有机絮凝剂 无机絮凝剂 絮凝特性 固结特性 marine dredged slurry organic flocculant inorganic flocculant flocculation characteristic consolidation characteristic
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