Vacuum preloading combined with multiple-flocculant treatment for dredged fill improvement
Vacuum preloading combined with multiple-flocculant treatment for dredged fill improvement
复制标题
真空预压结合多重絮凝剂处理改善疏浚填方
DOI：
10.1016/j.enggeo.2019.105194
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发表时间：
2019-09
影响因子：
7.4
通讯作者：
Zou Jian
中科院分区：
文献类型：
--
作者：
Wang Jun;Huang Guo;Fu Hongtao;Cai Yuanqiang;Hu Xiuqing;Lou Xiaoming;Jin Yawei;Hai Jun;Ni Junfeng;Zou Jian
由于疏浚淤泥含水量高、抗剪强度低，且主要由细粒颗粒组成，真空预压时排水板周围经常发生堵塞，导致土体固结不充分，土工性能变差。针对这一问题，提出了一种复合絮凝剂处理与真空预压相结合的疏浚淤泥改良方法。这是通过在真空预压之前用石灰和阴离子聚丙烯酰胺（APAM）预处理疏浚泥浆来实现的。在该方法中，一定量的石灰和APAM的添加允许小颗粒形成较大尺寸的物质，即它们絮凝，从而增加空隙率和渗透性。这导致形成新的天然土，更容易通过真空预压加固。为了验证所提出的方法的有效性，石灰含量的最佳比例，APAM含量进行了初步确定的沉积实验。采用石灰和APAM预处理后，进行了真空预压试验。试验结果表明，与石灰处理的浆液相比，APAM处理的浆液的抗剪强度和固结效率进一步提高。最后确定了真空预压的最佳石灰与APAM掺量比为2：0.1。
As dredged slurry has high water content and low shear strength, and mainly consists of fine-grained particles, clogging frequently occurs around prefabricated vertical drains (PVDs) during vacuum preloading, often leading to insufficient consolidation and poor geotechnical properties of soil. To address this issue, this paper proposes a method of multiple-flocculant treatment combined with vacuum preloading for improving dredged slurry. This is achieved by pre-treating the dredged slurry with lime and anionic polyacrylamide (APAM) prior to vacuum preloading. In this method, the additions of lime and APAM in a certain quantity allow small particles to form larger-sized mass, i.e. they flocculate, thereby increasing the void ratio and permeability. This results in the formation of a new natural soil that is easier to be consolidated by vacuum preloading. To verify the effectiveness of the proposed method, the optimum ratio of lime content to APAM content was preliminarily determined by performing a deposition experiment. A vacuum preloading test was carried out after the pre-treatment with lime and APAM. The experimental results show that with the help of APAM, the shear strength and consolidation efficiency further improve in comparison to the slurry treated with only lime. Finally, the optimum ratio of lime to APAM contents for vacuum preloading was determined as 2:0.1.
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影响因子：
6.9
作者：
Guangyin Zhen;Xiaofei Yan;Haiyan Zhou;Hua H. Chen;Tiantao Zhao;Youcai Zhao
通讯作者：
Guangyin Zhen;Xiaofei Yan;Haiyan Zhou;Hua H. Chen;Tiantao Zhao;Youcai Zhao
DOI：
10.1061/9780784413432.008
发表时间：
2014-05
期刊：
--
影响因子：
--
作者：
N. Zhang;Wei Zhu
通讯作者：
N. Zhang;Wei Zhu
影响因子：
5.2
作者：
Chai, Jinchun;Hong, Zhenshun;Shen, Shuilong
通讯作者：
Shen, Shuilong
DOI：
--
发表时间：
2016
期刊：
--
影响因子：
--
作者：
Wu Yajun;Lu Yitian;N. Kun;S. Dean
通讯作者：
Wu Yajun;Lu Yitian;N. Kun;S. Dean
DOI：
--
发表时间：
2010
期刊：
--
影响因子：
--
作者：
B. Indraratna
通讯作者：
B. Indraratna