MSWIBA改良海相淤泥质工程渣土性能与机理研究  

Performance and Mechanism of MSWIBA Improved Marine Silty Engineering Residue

作　　者：刘世宇 雷学文[1] 李江山[2] 刘夏临 张先伟 李雪和[1,2] 王平 LIU Shiyu;LEI Xuewen;LI Jiangshan;LIU Xialin;ZHANG Xianwei;LI Xuehe;WANG Ping(School of Urban Construction,Wuhan University of Science and Technology University,Wuhan,Hubei 430065,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics Chinese,Academy of Sciences,Wuhan,Hubei 430071,China;CCCC Second Highway Survey and Design Research Institute Co.,Ltd.,Wuhan,Hubei 430056,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]中国科学院武汉岩土力学研究所、岩土力学与工程国家重点实验室,湖北武汉430071 [3]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《水利与建筑工程学报》2023年第2期121-127,148,共8页Journal of Water Resources and Architectural Engineering

基　　金：中国科学院国际合作重点项目(115242KYSB20200002)。

摘　　要：利用MSWIBA与氢氧化钙-矿粉(GGBS)协同固化改良渣土,通过强度及浸出试验探究MSWIBA改良渣土的性能,采用XRD以及SEM-EDS对改良土进行微观表征。结果表明:掺入5%~10%的MSWIBA能改良渣土水稳性,有效降低渣土的液限;5%MSWIBA掺量的改良土具有较佳的应用效益,其水稳系数提高了16%、液限降低了5%,7 d无侧限抗压强度为1.95 MPa,符合路基填筑强度要求;改良土重金属浸出浓度均低于0.05 mg/L,符合Ⅲ类地下水以及Ⅱ类地表水的要求;MSWIBA改良土的主要水化产物为(N,C)-A-S-H以及钙矾石,强度和污染组分的稳定性均有提升,材料低碳经济,具有良好应用前景。MSWIBA was used to improve the spoil by synergistic curing with calcium hydroxide-granulated blast furnace slag powder(GGBS),and the performance of MSWIBA improved spoil was investigated by strength and leaching tests,and the improved soil was microscopically characterized by XRD and SEM-EDS.The results show that adding 5%~10%MSWIBA can improve the water stability of the spoil and reduce the liquid limit of the spoil effectively.The improved soil with 5%MSWIBA content has better application benefits,its water stability coefficient was increased by 16%,the liquid limit was reduced by 5%,the 7 d unconfined compressive strength was 1.95 MPa,which meets the requirements of subgrade filling strength.The leaching concentrations of heavy metals in the improved soil were all lower than 0.05 mg/L,which could meet the requirements of Class III groundwater and Class II surface water.The main hydration products of MSWIBA improved soil are(N,C)-A-S-H and ettringite.The stability of strength and pollution components have been improved.The material is low carbon economy and has good application prospects.

关 键 词：海相淤泥质工程渣土 MSWIBA 改良 工程特性 微观机理 

分 类 号：TU411[建筑科学—岩土工程]