徐志豪 章荣军 郑俊杰 屠林伟

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。通过室内模型试验确定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VP-FSCM的内在机理和可行性。结果表明：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，能进一步填充与密实土体结构。

关键词：疏浚淤泥浆;固化;絮凝;真空预压;抗剪强度;含水率

Abstract： Flocculation-solidification combined method （FSCM） is a reasonable choice for the treatment and recycling of extra-high water content dredged mud slurry （EHW-MS）. However， FSCM still has certain limitations in curing efficiency when the treated EHW-MS is recycled as filling material with high requirement on mechanical properties. In order to achieve the purpose of deep dehydration of dredged mud slurry and improve the efficiency of solidification， low-position vacuum preloading technology （VP） is introduced on the basis of FSCM， and a new technical method for EHW-MS used as embankment filler has been proposed-vacuum preloading-flocculation-solidification combined method （VP-FSCM）. A series of indoor model tests had been carried out to verify the advantages of the VP-FSCM， and to explore the law of its processing advantages with the equivalent initial moisture content; In addition， combined with microscopic testing methods （e.g. XRD and SEM）， the internal mechanism and feasibility of VP-FSCM have been analyzed and demonstrated. 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 processing advantage of VP-FSCM is that the quantity and development of hydration products such as C（A）SH gel and ettringite are significantly improved， and the soil structure are further filled and compacted.

Keywords： dredged mud slurry; solidification; flocculation; vacuum preloading; shear strength; water content

近年來，随着基础设施与生态工程建设的推进，大量港口码头不断扩建、湖泊河流也相继开展生态治理。各类工程建设中会产生大体量的高含水率疏浚淤泥（Mud Slurry at Extra High Water Content，以下简称EHW-MS）[1-2]。这些疏浚产生的淤泥往往呈流塑态泥浆状，存在细粒土占比过大、有机质与重金属离子污染程度较高等不良性质[3]，不适于直接利用和弃置处理[4]。目前，针对大体量EHW-MS采用的主要处理方式仍为堆场处理[5]。其主旨是将淤泥浆泵送至堆放场地，待一定时间自然风干或采用真空和堆载预压等人工干化技术[6-7]进一步脱水处理后再结合固化剂改性处理进行减量资源化利用。……