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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	Articles by authors
	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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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0528 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS1/3114

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