絮凝-固化-真空预压联合处理废弃淤泥(浆)试验研究
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作者单位:

1.国网江苏省电力有限公司建设分公司;2.华中科技大学 土木与水利工程学院

作者简介:

通讯作者:

中图分类号:

TU447

基金项目:

国网江苏省电力有限公司科技项目(J2020070)


Experimental study on flocculation-solidification combined with vacuum preloading treatment of waste mud
Author:
Affiliation:

1.State Grid Jiangsu Electric Power Co,Ltd Construction Branch;2.School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology

Fund Project:

Science and Technology Project of State Grid Jiangsu Electric Power Co., Ltd. (No. J2020070)

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    摘要:

    经絮凝调理和化学固化改性处理后,可改善高含水率淤泥初始不良工程特性,若将废弃淤泥(浆)资源化利用为路堤填料,势必对处理后淤泥强度有一定要求。作者近几年探索并证实了絮凝-固化-真空预压联合法(简称VP-FSCM)可以有效处理高含水率淤泥浆(含水率>300%),并将其转化为路堤填料。本研究通过开展一系列室内模型箱试验,一方面,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;另一方面,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:(1)VP-FSCM处理废弃淤泥后土体28天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;(2)沉降脱水和力学等特性结果表明,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5%、5%、1.5%和0.12%;(3)在最佳外加剂类型和掺量条件下,真空压力越高,处理后的废弃淤泥强度越高,养护后含水率越低。

    Abstract:

    After flocculation conditioning and chemical solidification, the initial bad 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 transform it into embankment filler. This study has carried out a series of laboratory model tests, on the one hand, to explore the feasibility and high efficiency of VP-FSCM process for treating waste mud (water content is about 150~300%); On the other hand, to optimize the formulation (type and 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 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 best 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 condition of the best additive type and dosage, the higher the vacuum pressure, the higher the strength of the treated waste mud and the lower the moisture content after curing.

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  • 收稿日期:2022-08-14
  • 最后修改日期:2022-09-28
  • 录用日期:2022-10-30
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