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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摘要以大连湾沉积的海相疏浚淤泥为对象，掺入适量的JCW软土胶结剂制备成流动固化土。采用粒径分析、X–射线衍射(XRD)和扫描电镜(SEM)分析固化土的微观组成和结构特征，探讨固化土的液塑限、无侧限抗压强度等宏观指标随养护龄期变化的内在机制。结果表明，在淤泥固化的过程中，粒径小于100 μm的淤泥颗粒在粒径为11和45 μm处出现明显的团粒化现象；随养护龄期的增长，液塑限呈指数增加，塑性指数呈指数减小，土的类别由黏性土向粉土转变，土的状态由流塑状态逐渐变成硬塑和半固态；胶结剂和淤泥作用形成交错搭接的三维网状结构，呈现出由固–水–气三相体系的淤泥逐渐向固–晶(结晶态含水化合物)–气准两相结构性体系的固化土转变。固化土的无侧限抗压强度随龄期增长呈指数增加，龄期从7 d增长到180 d时，无侧限抗压强度则从297 kPa增加到783 kPa。

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	陈伟
	乐绍林
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	蒋小鹏

关键词 ：土力学, 海相疏浚淤泥, 流动固化, 微观结构, 物相分析, 团粒化

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

引用本文:

陈伟，乐绍林，高文波，王伟，蒋小鹏. 海相疏浚淤泥流动固化的作用机制和微观结构分析[J]. 岩石力学与工程学报, 2020, 39(S1): 3114-3122.
CHEN Wei，YUE Shaolin，GAO Wenbo，WANG Wei，JIANG Xiaopeng. Solidification mechanism and microstructural investigations on flow-solidified marine dredged sludge. , 2020, 39(S1): 3114-3122.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0528 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/3114

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