水泥-粉煤灰固化海相淤泥质软土力学特性室内试验研究  

Laboratory experimental study on the mechanical properties of cement-fly ash solidified marine silty soft soil

作　　者：刘振建 姚达 邱成春[1] 芦业磊 刘旭 徐可 LIU Zhenjian;YAO Da;QIU Chengchun;LU Yelei;LIU Xu;XU Ke(School of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051,China;Jiangsu Province Engineering Investigation and Research Institute Co.,Ltd.,Yangzhou 225000,China;Jiangsu Hongji Water Source Technology Co.,Ltd.,Yangzhou 225000,China)

机构地区：[1]盐城工学院土木工程学院,江苏盐城224051 [2]江苏省工程勘测研究院有限责任公司,江苏扬州225000 [3]江苏鸿基水源科技股份有限公司,江苏扬州225000

出　　处：《江苏水利》2024年第11期34-38,共5页Jiangsu Water Resources

基　　金：江苏省大学生创新创业训练项目(202310305131H)。

摘　　要：针对滨海城市淤泥质软土的特殊地质条件引起的加固难题,依托淮河入海水道深厚软土段堤基加固工程,以水泥-粉煤灰为固化剂,开展了海相淤泥质软土固化室内试验,结合无侧限抗压强度和直接剪切测试,分析了淤泥固化土强度随水泥掺量、养护龄期、水泥-粉煤灰混合比的变化规律。结果表明,淤泥固化土的无侧限抗压强度和抗剪强度均随水泥掺量和养护龄期的增加而增大;粉煤灰的加入可显著提升淤泥固化土的无侧限抗压强度,增幅在10%~20%之间;淤泥固化土的黏聚力和内摩擦角与水泥掺量和养护龄期正相关,粉煤灰的加入使固化土黏聚力显著增大,内摩擦角的变化不显著。研究结果为指导海相淤泥质软土加固工程设计提供了理论和试验依据。In response to the reinforcement difficulties induced by the special geological conditions of silty soft soil in coastal city,an laboratory test was carried out on the solidification of marine silty soft soil using cement-fly ash as a solidifying agent based on the reinforcement project of embankment foundation of Huaihe River estuary channel.Combining the unconfined compressive strength(UCS)and direct shear tests,the variation of the strength of silty solidified soil with cement dosage,curing age and cement-fly ash mixing ratio was analyzed.Results indicate that both the UCS and shear strength of silt stabilized soil increase with the increasing cement content and curing age.The addition of fly ash can significantly increase the unconfined compressive strength of silt-solidified soil,with an increase of between 10%and 20%;The cohesion and internal friction angle of silt-solidified soil are positively related to the cement content and curing age.The addition of fly ash significantly increases the cohesion of solidified soil,but the change in internal friction angle is not significant.The research results provide theoretical and experimental basis for guiding the design of marine silty soft soil reinforcement engineering.

关 键 词：水泥-粉煤灰 海相淤泥质软土 无侧限抗压强度 抗剪强度 室内试验研究 

分 类 号：TV42[水利工程—水工结构工程]