Cl^(-1)和SO_4^(2-)对生态土侵蚀试验研究  

Experimental study on erosive effects of Cl^(-1)and SOSO_4^(2-) on ecological soil

作　　者：胡昕[1] 洪宝宁[1] 孙秋 张华杰[1] 

机构地区：[1]河海大学岩土工程水利部重点实验室 [2]南京市公路管理处公路科学研究所,南京210012

出　　处：《深圳大学学报（理工版）》2007年第4期368-372,共5页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(50279008);广东省交通厅科技资助项目(2002-06);江苏省交通科学研究计划资助项目(04Y006);盐城市科技发展计划资助项目(YKJ2004002)

摘　　要：选用NaCl和Na2SO4配制侵蚀溶液浸泡生态土试样,在指定龄期取出土样测定其单轴抗压强度、湿密度和含水率,拍摄对应的微结构图像,从而了解Cl-1和SO24-对生态土的侵蚀机理.研究结果表明:Cl-和SO24-对生态土力学性质的侵蚀非常明显,浸泡在以上离子溶液中的生态土抗压强度均有较大程度的降低;海水对生态土的侵蚀主要来自Cl-和SO42-对其颗粒集聚体之间连接物的溶蚀,对颗粒本身的溶蚀作用相对较小;Cl-对生态土的侵蚀作用比SO42-更为显著;在有海水回灌的地区,使用生态土加固软土地基时,必须采取措施防止海水对生态土的溶蚀.In order to study erosion mechanism of ecological soil in seawater, ecological soil samples were soaked in erosive solutions prepared from NaCl or Na2SO4. The soil samples were taken out in the appointed stadium. The uniaxial compressive strength, wet density and water content of the soil samples were measured. The microstructure images were taken by use of SEM. The results indicate that Cl^- and SO4^2- have a notable impact on physical and mechanical properties of ecological soil and the uniaxial compressive strength of ecological soil soaked in the above solutions decreases remarkably. The erosive effects of seawater on the ecological soil were mainly caused by the erosive effects of Cl^- and SO4^2- on connections among grain conglomerates. Cl^- and SO4^2- have less influences on grain conglomerates themselves. Cl^- has more prominent erosive effect on ecological soil than SO4^2-. The measures against the erosive effects of seawater on the ecological soil must be taken when soft soils are reinforced by use of ecological soil in area of seawater recharge.

关 键 词：生态土 侵蚀机理 力学特性 微结构 特征参数 

分 类 号：TU411.92[建筑科学—岩土工程] TU449[建筑科学—土工工程]