絮凝-固化联合真空预压处理高含水率淤泥(浆)试验研究
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TU432

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国家重点研发计划(2016YFC0800200);国家自然科学基金(51678266、51978303)


Experimental study on flocculation-solidification combined with vacuum preloading treatment of dredged mud with high moisture content
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    摘要:

    絮凝-固化联合法(FSCM)是超高含水率疏浚泥浆(EHW-MS)处理和循环利用的合理选择。然而,面向对填料力学性能要求较高的资源化利用情形时,FSCM在固化效率上仍存在一定的局限性。在FSCM的基础上引入低位真空预压技术(VP),对EHW-MS用作路堤填料提出了一套新的技术方法——真空预压-絮凝-固化联合法(VP-FSCM),以达到淤泥浆深度脱水、提高固化效率的目的。通过开展一系列室内模型试验,来确定所提出的VP-FSCM的优越性,并探究其处理优势随等效初始含水率的变化规律;结合微观测试手段,分析和论证了VP-FSCM的内在机理和可行性。结果显示,采用VP-FSCM能使试样的不排水抗剪强度最高提高至FSCM的1.65倍,并且强度优势稳定在1.2倍以上。其处理优势在微观层面上表现为C(A)SH凝胶、钙矾石等水化产物数量及发育程度得到明显提升,进一步填充与密实土体结构。

    Abstract:

    Flocculation-solidification combined (FSCM) is a reasonable choice for the treatment and recycling of dredged mud slurry at extra high water content (EHW-MS). However, FSCM tends to show some limitations when the treated EHW-MS is recycled as filling material with high requirement on mechanical properties. In order to improve the treatment efficiency of EHW-MS, a new method is proposed, i.e., vacuum preloading-flocculation-solidification combined method (VP-FSCM). A series of laboratory model tests are done to verify the advantages of the VP-FSCM, and to identify the variation of its treatment advantages with the equivalent initial water content. In addition, the internal mechanism and feasibility of VP-FSCM are analyzed and demonstrated by micro-tests (e.g. XRD and SEM). The results show that the undrained shear strength of the VP-FSCM treated EHW-MS can be increased to 1.65 times than that of FSCM, and the strength advantage is maintained at least 1.2 times. On the micro level, the advantage of VP-FSCM is that the quantity and development of hydration products such as C(A)SH gel and ettringite have been significantly improved, and the soil structure has been further filled and compacted.

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徐志豪,章荣军,郑俊杰,屠林伟.絮凝-固化联合真空预压处理高含水率淤泥(浆)试验研究[J].土木与环境工程学报(中英文),2021,43(5):10-18.

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  • 收稿日期:2020-09-18
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  • 在线发布日期: 2021-07-20
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