水泥与粗颗粒工程弃土复合固化改良淤泥土试验研究  

Experimental Study on Composite Solidification and Improvement of Silt Soil by Cement and Coarse Particle Engineering Spoil

作　　者：秦玉禹 秦子鹏 黄煌 蒋光荣 郭显顶 黄益鑫 郑艳娜 许尔金 高景泉 QIN Yu-yu;QIN Zi-peng;HUANG Huang;JIANG Guang-rong;GUO Xian-ding;HUANG Yi-xin;ZHENG Yan-na;XU Er-jin;GAO Jing-quan(School of Ocean andCivil Engineering,Dalian Ocean University,Dalian 116023,China;School of Water Resources and Environmental Engineering,Zhejiang University of Water Resources and Hydropower,Hangzhou 310018,China;Cangnan County Water Resources Bureau,Wenzhou 325899,China;Wenzhou Water Conservancy Construction Management Center,Wenzhou 325000,China;Zhejiang Water Engineering Consulting Co.,Ltd.,Hangzhou 310052,China)

机构地区：[1]大连海洋大学海洋与土木工程学院,大连116023 [2]浙江水利水电学院水利与环境工程学院,杭州310018 [3]温州市苍南县水利局,温州325899 [4]温州市水利建设管理中心,温州325000 [5]浙江水专工程顾问有限公司,杭州310052

出　　处：《科学技术与工程》2024年第12期5076-5087,共12页Science Technology and Engineering

基　　金：浙江水利水电学院科研基金(xky2022013);浙江省社科规划项目(22FNSQ66YB)。

摘　　要：为实现工程弃土的资源化利用和降低工程投资,以苍南县安澜工程(南片海塘)护塘河开挖产生的淤泥质土为研究对象,将附近绿能小镇三澳核电站工程弃土作为粒径改良用土,并采用水泥作为固化剂,通过不固结不排水(UU)三轴剪切试验研究水泥与粗颗粒工程弃土复合改良淤泥土的物理力学性能,并得到既符合工程设计要求又具较好经济性的改良土配合比。试验结果表明:影响改良土物理力学性能因素主要为粗颗粒弃土占比、水泥掺量、养护龄期,其中水泥掺量与养护龄期影响最为显著;单掺改良时,粗颗粒掺量对改良土的力学性能影响较小,改良效果不佳。淤泥土、粗颗粒土、水泥掺量分别为40%、60%、15%,养护龄期为56 d时淤泥质土的改良效果最佳,最大偏应力和黏聚力分别为2897.87、567.63 kPa。改良后的土作为海塘闭气土方用土能够满足工程设计要求。研究成果能够为海塘工程设计和施工提供理论依据和指导。To realize the resource utilization of engineering spoil and reduce the project investment,taking the muddy soil generated from the excavation of the protective river of the Anlan Project(southern seawall)in Cangnan County as the research object,the abandoned soil from the nearby green energy town San ao Nuclear Power Plant project was used as soil for particle size improvement,and cement was used as a solidifying agent.The physical and mechanical properties of the composite improvement of silt soil with cement and coarse particle engineering abandoned soil were studied through unconsolidated undrained(UU)triaxial shear tests,and an improved soil mix ratio that met the engineering design requirements and had good economic efficiency was obtained.The experimental results show that the main factors affecting the physical and mechanical properties of the improved soil are the proportion of coarse particle waste soil,cement content and curing age,the cement content and curing age have the most significant impact.When single addition is used for improvement,the amount of coarse particles has little impact on the mechanical properties of the improved soil,resulting in poor improvement effect.When the content of the mucky soil,coarse grained soil and cement is 40%,60%and 15%,respectively,and the curing period is 56 days,the improvement effect of muddy soil is the best,with the maximum deviator stress and cohesion being 2897.87,567.63 kPa,respectively.This improved soil can meet the engineering design requirements as a soil for enclosed air in seawalls.The research results can provide theoretical basis and guidance for the design and construction of the seawall engineering.

关 键 词：淤泥土 粗颗粒土 级配改良 复合改良 三轴试验 物理力学特性 

分 类 号：TU411.7[建筑科学—岩土工程]