海相淤泥资源化制备路基填料试验研究  

Experimental Study on Using Marine Silt as Subgrade Filler

作　　者：沈尔卜 胡兴龙 徐民主 张柏泉 杨武 SHEN Er-bu;HU Xing-long;XU Min-zhu;ZHANG Bai-quan;YANG Wu(CCCC SHEC Wuhan Harbour New Materials Co.,Ltd.,Wuhan 430100,China;CCCC Wuhan Harbour Engineering Design&Research Co.,Ltd.,Wuhan 430100,China;Hubei Key Laboratory of Advanced Materials&Reinforcement Technology Research for Marine Environment Structures,Wuhan 430100,China)

机构地区：[1]中交二航武汉港湾新材料有限公司,武汉430100 [2]中交武汉港湾工程设计研究院有限公司,武汉430100 [3]海工结构新材料及维护加固技术湖北省重点实验室,武汉430100

出　　处：《四川环境》2024年第1期146-152,共7页Sichuan Environment

摘　　要：海相淤泥堆弃占用大量土地资源,二次污染风险高。对瓯海底泥展开单因素试验发现,单一胶凝材料对瓯海底泥固化效果不佳,而混料试验模型表明在水泥∶水渣∶石膏=6.2%∶1.8%∶2.0%的配合比和掺量条件下,固化土7d无侧限抗压强度可达2.12MPa,与实际试验结果2.36 MPa相接近。在该最佳配合比条件下固化土的液塑限、击实性能和CBR值得到显著改善,路用性能优于传统水泥固化土,同时复合固化后瓯海底泥由轻污染等级转变为安全等级,环境安全性可靠。通过微观分析,经复合固化淤泥微颗粒之间的孔隙显著减少,进一步论证了复合固化土性能提升的潜在原因。资源化利用海相淤泥制路基填筑可大规模消纳底泥,经济效益和环保效益显著,本次试验为海相淤泥的道路应用提供了借鉴意义。The dumping of marine silt occupies a lot of land resources and poses high risk of secondary pollution.The single-factor test of the sediment in Ouhai found that a single cementitious material was not effective in curing the sediment in Ouhai,while the mixture test model showed that the 7-d unconfined compressive strength of the cured soil could reach 2.12 MPa under the conditions of cement:slag:gypsum=6.2%∶1.8%∶2.0%,which was close to the actual test result of 2.36 MPa.The liquid-plastic limit,compaction performance and CBR of the cured soil under the best mix proportion were significantly increased,and the performance of the road constructed with such cured soil was superior to that constructed with conventional cement-stabilized soil,and the sediment in Ouhai changed from a source of mild pollution to a safe and reliable substance after composite curing.The microscopic analysis indicated that pores between silt microparticles that had undergone composite curing were significantly reduced,which further demonstrates the potential cause for the improved performance of the composite cured soil.Preparing the roadbed fill with marine silt consumes a lot of sediment,producing significant economic and environmental benefits.This test provides reference for the use of marine silt in road construction.

关 键 词：海相淤泥 路基土 路用性能 环境安全性 

分 类 号：X705[环境科学与工程—环境工程]