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。

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.

TU432

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