NH_4^+和SO_4^(2-)耦合侵蚀下水泥土的力学性质试验  

Experimental study on the mechanical properties of cement soil under NH_4^+ and SO_4^(2-) interaction influence

作　　者：卢世军 陈洪祥 邓通发[3,4] 彭勃[3,4] 訾岩珂 

机构地区：[1]江西省交通建设工程质量监督管理局,南昌330008 [2]江西公路开发总公司,南昌330038 [3]江西理工大学建筑与测绘工程学院,江西赣州341000 [4]江西省环境岩土与工程灾害控制重点实验室,江西赣州341000

出　　处：《江西理工大学学报》2017年第3期1-7,共7页Journal of Jiangxi University of Science and Technology

基　　金：江西省自然科学基金资助项目(2015BAB206054);江西省交通厅科技项目(2014C0007)

摘　　要：为研究NH_4^+和SO_4^(2-)耦合侵蚀下水泥土的力学性质,将制备的水泥土试块置于不同浓度的硫酸铵和硫酸钠溶液中进行长期(150 d)浸泡,通过无侧限抗压强度试验,得到无侧限抗压强度随侵蚀溶液浓度和侵蚀时间的变化规律,分析NH_4^+和SO_4^(2-)耦合侵蚀对水泥土力学性质的影响.研究结果表明:低浓度的SO_4^(2-)在初期对水泥土的抗压强度有明显促进作用;当硫酸铵溶液浓度大于9.0 g/L后,相较于NH_4^+,SO_4^(2-)对水泥土的侵蚀占主导地位;NH_4^+对水泥土有一定的侵蚀作用,且随侵蚀浓度的增加而逐步提高;NH_4^+和SO_4^(2-)通过化学侵蚀和晶体膨胀侵蚀,影响水泥土的力学性质.In order to study the mechanical properties of cement soil under NH_4~＋and SO_4^（2-）interaction erosion,the prepared cement soil clod is put into different concentrations of ammonium sulfate and sodium sulfate solution to immerse for about 150 days. Through the unconfined compressive strength test, this paper gets the changing laws of the unconfined compressive strength with the change of solution concentration and time of erosion and analyzes the effect of NH_4~＋and SO_4^（2-）interaction erosion on the mechanical properties of cement soil. The results of the research show that the sulfate ion of low concentration has an auxo-action for the compressive strength initially; when the solution concentrations of ammonium sulfate is more than 9.0 g/L,sulfate ion in soil erosion dominated comparing with ammonium ions; Ammonium ions of water soil have an erosion effect on cement soil, and gradually rise with the increase of the concentration of erosion; Ammonium ions and sulfate ions affect the mechanical properties of soil through chemical erosion and the erosion of the crystal expansion.

关 键 词：水泥土 侵蚀试验 无侧限抗压强度 离子浓度 侵蚀时间 

分 类 号：TU528[建筑科学—建筑技术科学]