海相疏浚淤泥流动固化的作用机制和微观结构分析

doi:10.13722/j.cnki.jrme.2019.0528

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Abstract The solidified soil was prepared from marine dredged sludge deposited in Dalian bay by adding a proper amount of JCW sludge stabilizer. The microstructure and structural characteristics of solidified soil were investigated by particle size analysis，X-ray diffraction(XRD) and scanning electron microscope(SEM). The internal mechanism is discussed，which changes in macro indicators of solidified soil，such as liquid-plastic limit and unconfined compressive strength. The results show that，during the curing period of solidified soil，the silt with grain-size less than 100 μm shows obvious agglomeration phenomenon，when grain-size are 11 μm and 45 μm. With the increase of curing age，the liquid-plastic limit increases exponentially，while the plasticity index decreases exponentially. The category of soil changes from viscous soil to silty soil，and the state of soil gradually changes from fluid-plastic state to hard plastic and semi-solid state. The three-dimensional network structure formed by the interaction of stabilizer and silt，which promotes the gradual transformation from three-phase system composed of solid-liquid-gas to quasi two-phase system composed of solid-crystal-gas. Unconfined compressive strength of solidified soil increases exponentially with the increase of curing age，unconfined compressive strength increases from 297 kPa to 783 kPa，when curing age increases from 7 d to 180 d.

Key words： soil mechanics marine dredged sludge flow-solidification microstructure phase analysis agglomeration

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	CHEN Wei
	YUE Shaolin
	GAO Wenbo
	WANG Wei
	JIANG Xiaopeng

Cite this article:

CHEN Wei,YUE Shaolin,GAO Wenbo, et al. Solidification mechanism and microstructural investigations on flow-solidified marine dredged sludge[J]. , 2020, 39(S1): 3114-3122.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0528 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS1/3114

[1] 朱伟，闵凡路，吕一彦.“泥科学与应用技术”的提出及研究进展[J]. 岩土力学，2013，34(11)：3 041–3 054.(ZHU Wei，MIN Fanlu，Lü Yiyan. Subject of “mud science and application technology”and its research progress[J]. Rock and Soil Mechanics，2013，34(11)：3 041–3 054.(in Chinese)) [2] 陈萌，杨国录，徐峰，等. 淤泥固化处理研究进展[J]. 南水北调与水利科技，2018，16(5)：128–138.(CHEN Meng，YANG Guolu，XU Feng，et al. Research progress on solidification treatment of dredged sludge[J]. South-to-North Wster Transfers and Water Science and Technology，2018，16(5)：128–138.(in Chinese)) [3] 汤怡新，刘汉龙，朱伟. 水泥固化土工程特性试验研究[J]. 岩土工程学报，2000，22(5)：549–554.(TANG Yixin，LIU Hanlong，ZHU Wei. Study on engineering properties of cement-stabilized soil[J]. Chinese Journal of Geotechnical Engineering，2000，22(5)：549–554.(in Chinese)) [4] 丁建文，洪振舜，刘松玉. 疏浚淤泥流动固化处理与流动性试验研究[J]. 岩土力学，2011，32(增1)：280–284.(DING Jianwen，HONG Zhenshun，LIU Songyu. Study of flow-solidification method and fluidity test of dredged clays[J]. Rock and Soil Mechanics，2011，32(Supp.1)：280–284.(in Chinese)) [5] 胡孝彭，赵仲辉. 固化淤泥持水特性的微观机理研究[J]. 人民长江，2017，48(13)：81–84.(HU Xiaopeng，ZHAO Zhonghui. Micro-mechanism of water retention property of solidified dredged material[J]. Yangtze River，2017，48(13)：81–84.(in Chinese)) [6] 柴肇云，郭卫卫，康天合，等.水化学环境变化对泥质岩胀缩性的影响[J]. 岩石力学与工程学报，2013，32(2)：281–288.(CHAI Zhaoyun，GUO Weiwei，KANG Tianhe，et al. Effect of aqueous environmental chemistry change on swell-shrink property of argillaceous rock[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(2)：281–288.(in Chinese)) [7] WANG J M，GUO L L，BAI Z K，et al． Using computed tomography (CT) images and multi-fractal theory to quantify the pore distribution of reconstructed soils during ecological restoration in opencast coal-mine[J]. Ecological Engineering，2016，92( 2)：148–157． [8] HORPIBULSUK S，MIURA N，NAGARAJ T S. Assessment of strength development in cement-admixed high water content clays with Abrams′ law as a basis[J]. Geotechnique，2003，53(4)：439– 444. [9] 张春雷. 基于水分转化模型的淤泥固化机理研究[博士学位论文][D]. 南京：河海大学，2007.(ZHANG Chunlei. Study of dredged sediments solidification mechanism based on water transfer model[Ph. D. Thesis] [D]. Nanjing：Hohai University，2007.(in Chinese)) [10] 贺行洋，陈益民，张文生. 土的组成、结构与固化技术[J]. 岩土工程技术，2003，(3)：129–133.(HE Xingyang，CHEN Yimin，ZHANG Wensheng. Composition，structure and stabilization of soil[J]. Geotechnical Engineering Technique，2003，(3)：129–133.(in Chinese)) [11] 史旦达，齐梦菊，许冰沁，等. 固化疏浚土宏–微观力学特性室内试验研究[J]. 长江科学院院报，2018，35(1)：117–127.(SHI Danda，QI Mengju，XU Bingqin，et al. Indoor test on the macro-and- microscopic mechanical properties of solidified dredged Soils[J]. Journal of Yangtze River Scientific Research Institute，2018，35(1)：117–127.(in Chinese) ) [12] 黄新，宁建国，郭晔，等. 水泥含量对固化土结构形成的影响研究[J]. 岩土工程学报，2006，28(4)：436–441.( HUANG Xin，NING Jianguo，GUO Ye，et al. Effect of cement content on the structural formation of stabilized soil[J]. Chinese Journal of Geotechnical Engineering，2006，28(4)：436–441.(in Chinese)) [13] 张先伟，孔令伟，王静. 针对黏性土胶质联结特征的 SEM-EDS试验研究[J]. 岩土力学，2013，34(增2)：195–203.(ZHANG Xianwei，KONG Lingwei，WANG Jing. Experimental study of SEM-EDS for cementation bond characteristics of Zhanjiang clay[J]. Rock and Soil Mechanics，2013，34(Supp. 2)：195–203.(in Chinese) [14] 甘雅雄，朱伟，吕一彦. 从水分转化研究早强型材料固化淤泥的早强机理[J]. 岩土工程学报，2016，38(4)：755–760.(GAN Yaxiong，ZHU Wei，Lü Yiyan. Early-strength mechanism of cementitious additives from perspective of water conversion[J]. Chinese Journal of Geotechnical Engineering，2016，38(4)：755–760.(in Chinese)) [15] 王东星，王宏伟，肖杰. 活性MgO固化淤泥水稳特性试验研究[J]. 浙江大学学报：工学版，2018，52(4)：719–726.(WANG Dongxing，WANG Hongwei，XIAO jie. Experimental study on water stability property of dredged sludge solidified with reactive MgO[J]. Journal of Zhejiang University：Engineering Science，2018，52(4)：719–726.(in Chinese)) [16] 吴雪婷，项伟，王臻华. 离子型土壤胶结剂固化淤泥的微观机理研究[J]. 工程地质学报，2018，26(5)：1 285–1 291.(WU Xueting，XIANG Wei，WANG Zhenhua. Microscopic mechanism of solidified silt with ionic soil stabilizer[J]. Journal of Engineering Geology，2018，26(5)：1 285–1 291.(in Chinese)) [17] 田晓峰，张大捷，侯浩波. 矿渣胶凝材料稳定软土的微观结构[J]. 硅酸盐学报，2006，34(5)：636–640.(TIAN Xiaofeng，ZHANG Dajie，HOU Haobo. Microstructure of weak soil stabilization slag cementing material[J]. Journal of the Chinese ceramic society，2006，34(5)：636–640.(in Chinese) ) [18] 易耀林，李晨，孙川，等.碱激发矿粉固化连云港软土试验研究[J]. 岩石力学与工程学报，2013，32(9)：1 820–1 826.(YI Yaolin，LI Chen，SUN Chuan，et al. Test on alkali-activated ground granulated blast-furnace slag(GGBS) for Lianyungang soft soil stabilization[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(9)：1 820–1 826.(in Chinese) ) [19] 郭印，徐日庆，邵允铖. 淤泥质土的固化机理研究[J]. 浙江大学学报：工学版，2008，42(6)：1 071–1 075.(GUO Yin，XU Riqing，SHAO Yuncheng. Study on mechanism of muddy soil stabilization [J]. Journal of Zhe jiang University：Engineering Science，2008，42(6)：1 071–1 075.(in Chinese))