碳酸铵溶液作用下红黏土工程特性试验  

Engineering Characteristics Experiment of Red Clay Under Action of Ammonium Carbonate Solution

作　　者：李善梅[1,2] 刘之葵[1,2] 蒙剑坪[1,2] 陈晖文 王煜栋 吕伟威 LI Shanmei;LIU Zhikui;MENG Jianping;CHEN Huiwen;WANG Yudong;LV Weiwei(College of Civil Engineering & Architecture,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Mechanics & Geotechnical Engineering,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《河南科技大学学报（自然科学版）》2019年第6期57-63,M0005,M0006,共9页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(41867039);广西自然科学基金项目(2017GXNSFAA198238);国家级大学生创新创业训练计划基金项目(201710596035)

摘　　要：农业用地长期受化肥污染,其工程性质发生改变。通过直接剪切、一维固结以及变水头渗透试验,分别研究了不同浓度碳酸铵溶液作用下红黏土的抗剪强度、压缩性以及渗透性。试验结果表明:随着碳酸铵溶液浓度的增大,红黏土的黏聚力和渗透性均增大,而同级荷载作用下的破坏强度、内摩擦角以及压缩模量则减小。利用双电层理论,计算不同浓度碳酸铵溶液浸泡后红黏土表面结合水膜厚度,并分析红黏土工程性质的影响机理。碳酸铵溶液改变土体结合水膜厚度,是影响红黏土强度、压缩性和渗透性的根本原因。The agricultural soils were polluted by the chemical fertilizer for a long time,which led to changing of the soil engineering properties.The strength,compressibility and permeability of red clay contaminated by different concentration solution of ammonium carbonate were tested.The test results show that the cohesion values and the permeability of red clay increase,but the failure strength under the same load,internal friction angle and modulus of compressibility decrease with increasing of the concentration of ammonium carbonate solution.The hydrated film thickness in the red clay is calculated by the theory of double electric layer.And the mechanism of the engineering properties of red clay contaminated by the ammonium carbonate solution is analyzed.The thickness of hydrated film is the key to influence of the strength,compressibility and permeability of red clay.

关 键 词：红黏土 化肥 双电层 工程性质 

分 类 号：TU43[建筑科学—岩土工程]