考虑土体盐碱化影响的注浆絮凝-真空预压法加固疏浚淤泥试验研究  

Experimental study on consolidation of dredged sludge by grouting flocculationvacuum preloading method considering influences of soil salinization

作　　者：王军[1,2,3,4] 张凯宇 倪俊峰 符洪涛[1,2,3,4] 彭怡 WANG Jun;ZHANG Kaiyu;NI Junfeng;FU Hongtao;PENG Yi(College of Civil Engineering and Architecture,Wenzhou University,Wenzhou 325035,China;Key Laboratory of Weak Land Foundation and Sea Reclamation Engineering Technology of Zhejiang Province,Wenzhou 325035,China;Zhejiang Engineering Research Center for Disaster Prevention and Reduction Technology,Wenzhou 325035,China;Collaborative Innovation Center of Zhejiang Province,Wenzhou 325035,China)

机构地区：[1]温州大学建筑与土木工程学院,浙江温州325035 [2]浙江省软弱土地基与海涂围垦工程技术重点实验室,浙江温州325035 [3]滨海软土地基防灾减灾技术浙江省工程研究中心,浙江温州325035 [4]浙江省海涂围垦及其生态保护协同创新中心,浙江温州325035

出　　处：《岩土工程学报》2025年第4期801-810,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家杰出青年科学基金项目(52325806);国际(地区)合作与交流项目(W2411045);国家自然科学基金项目(52178348,52408389,52478357);浙江省基础公益研究计划项目(LTGG24E080004);温州市基础性科研项目(ZS2023005,S2023002,S2023004);温州市科协服务科技创新项目(kjfw72);浙江省教育厅一般科研项目(Y202352701)。

摘　　要：为了解决疏浚淤泥渗透性差和排水固结时间长等难题,常常采用絮凝-真空预压法处理,针对既有地基,本研究提出注浆絮凝-真空预压的地基处理方法。针对不同初始含水率的土体,设计并开展了不同石灰掺量的室内模型试验,研究其对疏浚淤泥的加固效果。试验过程中监测了孔隙水压力、排水量、沉降量的变化,试验结束后检测了土体的pH值、含盐量、含水率及十字板剪切强度等指标。在考虑强度增长和土体盐碱化影响的基础,研究得出了注浆絮凝-真空预压法的最优石灰掺量。然后通过龙湾二期滨海湿地修复工程的现场试验进一步验证了注浆絮凝-真空预压法的有效性。研究结论可为类似疏浚淤泥处理工程提供设计参考。To address the issues of poor permeability and long consolidation time of dredged sludge,the flocculation-vacuum preloading method has been widely employed to treat such soil.For the existing soft soil foundation,a combined method that integrated grouting flocculation and vacuum preloading was proposed.The indoor model tests were conducted on the dredged sludge with varying initial water contents where different lime contents were controlled.The changes of the pore water pressure,displacement and settlement were monitored.The pH,salinity,water content and vane shear strength of soil were measured after the tests.The optimal lime content,considering the influence of strength growth and soil salinization,was determined for the grouting flocculation-vacuum preloading.Then the efficacy of the combined method was further verified through its application in Longwan Phase II coastal wetland restoration project.The results of this study can be used as a design reference for the applications of the combined method in other similar projects.

关 键 词：疏浚淤泥 石灰改性 淤堵 注浆絮凝-真空预压法 土体盐碱化影响 

分 类 号：TU411[建筑科学—岩土工程]