软土地基加固用新型土壤固化剂的制备及性能研究  

Study on Preparation and Performance of New Soil Solidifying Agent for Soft Soil Foundation Reinforcement

作　　者：廖光志 邹志雄 LIAO Guangzhi;ZOU Zhixiong(Fujian Institute of Geotechnical Engineering Investigation and Surveying Co.,Ltd.,Fuzhou Fujian 350108,China)

机构地区：[1]福建岩土工程勘察研究院有限公司,福建福州350108

出　　处：《当代化工》2024年第4期869-872,909,共5页Contemporary Chemical Industry

基　　金：福建省自然科学基金项目(项目编号:2023J01423)。

摘　　要：为了提高软土资源的利用效率,以丙烯酸酯BA、丙烯酸AA和苯乙烯St作为单体,以脂肪醇聚氧乙烯AEO-9和山梨醇酐单油酸酯SP80作为乳化剂,通过乳液聚合法制备了一种适合软土地基加固用的新型土壤固化剂PPG-1,并对其综合性能进行了评价。结果表明:土壤固化剂PPG-1的掺量越大,无侧限抗压强度、水稳定系数、抗冻指数和质量损失率就越大。养护龄期越长,无侧限抗压强度和水稳定系数就越大,固化处理效果就越好。推荐土壤固化剂PPG-1的最佳掺量为0.5%,能使目标固化土试样在养护7 d时的无侧限抗压强度值达到2.81 MPa,水稳定系数达到85.7%,并且经过冻融循环5次后的抗冻指数达到83.6%,质量损失率为小于5%,各项性能参数均能满足标准《土壤固化剂应用技术标准》(CJJ/T 286-2018)中对固化土性能指标的要求。新型土壤固化剂PPG-1能够显著改善软土样品的力学性能、耐水性能和抗冻性能,能够满足软土地基加固的需求。In order to improve the utilization efficiency of soft soil resources,a new soil curing agent PPG-1 was prepared by lotion polymerization with acrylate BA,acrylic acid AA and styrene St as monomers,and fatty alcohol polyoxyethylene AEO-9 and sorbitan monooleate SP80 as emulsifiers.And its comprehensive performance was evaluated.The results showed that the larger the dosage of soil stabilizer PPG-1,the greater the unconfined compressive strength,water stability coefficient,frost resistance index,and mass loss rate.The longer the curing age,the greater the unconfined compressive strength and water stability coefficient,and the better the solidification treatment effect.The recommended optimal dosage of soil solidifying agent PPG-1 was O.5%,which could achieve an unconfined compressive strength value of 2.81 MPa and a water stability coefficient of 85.7% for the target solidified soil specimen after 7 d curing.After 5 freeze-thaw cycles,the frost resistance index reached 83.6%,and the mass loss rate was less than 5%.All performance parameters could meet the requirements of the standard"Technical Standards for the Application of Soil Solidifying Agents"(CJJ/T 286-2018)for the performance indicators of solidified soil.The new soil stabilizer PPG-1 could significantly improve the mechanical properties,water resistance,and frost resistance of soft soil samples,and could meet the needs of soft soil foundation reinforcement.

关 键 词：软土地基 固化土 土壤固化剂 无侧限抗压强度 水稳定性能 

分 类 号：TU472[建筑科学—结构工程]