化学腐蚀影响下水泥土力学性质试验研究  

Experimental Study on the Mechanical Properties of Soil-Cement Under the Influence of Chemical Corrosion

作　　者：李飞鹏 LI Feipeng(China Railway 11th Bureau Group City Rail Engineering Co.Ltd.,Wuhan Hubei 430074,China)

机构地区：[1]中铁十一局集团城市轨道工程有限公司,湖北武汉430074

出　　处：《铁道建筑技术》2024年第12期75-79,共5页Railway Construction Technology

基　　金：中铁十一局集团城市轨道工程有限公司科技研究开发计划项目(2023-05)。

摘　　要：以水泥土为研究对象,通过试验分析水泥土在多变碱盐环境下的力学与物理性能演变规律,探讨其劣化机制。结果表明:随溶液浓度升高,水泥土在碱性溶液中浸泡7 d后,其液限、塑限及塑性指数均呈上升趋势;相反,在盐性溶液中,随溶液浓度增加,浸泡7 d后的水泥土液限、塑限及塑性指数却呈下降趋势。在碱盐溶液浓度相同情况下,水泥土抗压强度会随浸泡时间的增加而提高;但当浸泡时间保持不变时,增大溶液浓度反而会导致水泥土抗压强度逐步下降。水泥土在氢氧化钠溶液中浸泡21 d后其强度开始下降,为确保水泥土在受到氢氧化钠溶液侵蚀时仍能满足工程强度要求,通常需要采取相应措施。Taking soil-cement as the research object,this paper studies the evolution law of mechanical and physical properties of soil-cement under variable alkaline and salt environment,and elucidates its deterioration mechanism.The results show that with the increase of solution concentration,the liquid limit,plastic limit and plastic index of soil-cement after soaking in alkaline solution for 7 days show an increasing trend.On the contrary,with the increase of solution concentration in saline solution,these indexes of soil-cement after soaking for 7 days show a downward trend.It is also observed that the compressive strength of soil-cement will increase with the increase of soaking time under the same concentration of the alkaline solution and saline solution.However,when the soaking time remains unchanged,increasing the concentration of the solution will lead to a gradual decline in the compressive strength of soil-cement.When soil-cement was soaked in sodium hydroxide solution for 21 days,its strength began to decline.Therefore,in order to ensure that soil-cement can still meet the engineering strength requirements when attacked by sodium hydroxide solution,corresponding measures are usually needed.

关 键 词：化学侵蚀 水泥土 液限 塑限 塑性指数 抗压强度 室内试验 

分 类 号：TU411[建筑科学—岩土工程]