絮凝调理和化学固化改性处理能改善高含水率淤泥初始不良工程特性，将废弃淤泥（浆）资源化利用为路堤填料对淤泥强度有一定要求。已有研究证实了絮凝-固化-真空预压联合法（VP-FSCM）可以有效处理高含水率淤泥浆（含水率>300%），且处理后的淤泥强度满足路堤填料需求。通过室内模型箱试验探索VP-FSCM工艺处理废弃淤泥（含水率约为150%~300%）的可行性和高效性；优化VP-FSCM工艺在处理淤泥中的外加剂配方（类型和掺量等）。试验结果表明：VP-FSCM处理废弃淤泥后土体28 d不排水抗剪强度为絮凝-固化法（FSCM）处理废弃淤泥后的2.76倍，证实了VP-FSCM处理废弃淤泥的高效、可行性。沉降脱水和力学等特性分析结果表明，VP-FSCM工艺处理废弃淤泥的最佳外加剂种类为水泥（OPC）、高炉矿渣（GGBS）、生石灰（CaO）和聚丙烯酰胺（PAM），且最优掺量分别为5.0%、5.0%、1.5%、0.12%；在最佳外加剂类型和掺量条件下，真空压力越高，处理后的废弃淤泥不排水抗剪强度越高，养护后含水率越低。

After flocculation conditioning and chemical solidification, the engineering characteristics of high-water-content mud can be improved. If waste mud is to be recycled into embankment filler, it is bound to have certain requirements on the strength of the treated mud. In recent years, the authors have explored and proved that the vacuum preloading-flocculation-solidification combined method (VP-FSCM) can effectively treat mud slurry with high water content (>300%), and the strength of the treated mud can meet the demand for embankment filler utilization. This study has carried out a series of laboratory model tests to explore the feasibility and high efficiency of VP-FSCM process for treating waste mud (water content is about 150%-300%); and to optimize the formulation (type, dosage, etc.) of VP-FSCM process in waste mud treatment. The test results show that: (1) The undrained shear strength of the waste mud treated by VP-FSCM after 28 days is 2.76 times that of the waste mud treated by the flocculation-solidification combined method (FSCM), which proves the high efficiency and feasibility of VP-FSCM. (2) The results of dehydration / settlement characteristics and mechanical characteristics show that the optimal additives for treating waste mud by VP-FSCM process are cement (OPC), ground granulated blastfurnace slag (GGBS), quicklime (CaO) and polyacrylamide (PAM), and their optimal contents are 5%, 5%, 1.5% and 0.12% respectively. (3) Under the optimal additive type and dosage, higher vacuum pressure results in greater undrained shear strength of the treated waste mud and lower moisture content after curing.

TU472.5

国网江苏省电力有限公司科技项目（J2020070）