酸碱污染土强度特性的室内试验研究  

Laboratory tests on shear strength properties of soil polluted by acid and alkali

作　　者：朱春鹏[1] 刘汉龙[2,3] 沈扬[2,3] 

机构地区：[1]常州大学岩土工程研究所,江苏常州213164 [2]河海大学岩土力学与工程教育部重点实验室,江苏南京210098 [3]河海大学岩土工程研究所,江苏南京210098

出　　处：《岩土工程学报》2011年第7期1146-1152,共7页Chinese Journal of Geotechnical Engineering

摘　　要：随着环境污染不断加剧,城市土地被污染亦屡见不鲜,这使得污染土研究成为环境岩土工程领域中的一个崭新课题。酸碱污染使地基土改性,因此,研究酸碱污染土的污染机制、勘察评价和处理措施,对稳定建筑工程质量,保护环境有重要意义。通过人工方法制备了4种不同浓度的酸碱污染土试样,通过直剪试验和三轴试验研究了不同浓度酸碱污染土强度特性,并对影响酸碱污染土直剪强度各种因素进行了分析,包括土样稠度状态、孔隙比和微观结构的影响。在此基础之上,研究了酸污染土总应力强度指标与其浓度的关系,得到了计算公式,便于工程应用。With the aggravation of environmental pollution,the urban soils are severely polluted,which makes the research on polluted soils a new topic in the environmental geotechnology and much attention is attracted from the academic and engineering fields.The properties of the foundation soils are changed by acid and alkali pollution.Hence,environmental protection is of great significance for studying the pollution mechanism,survey evaluation and treatment of polluted soils.The polluted soils with 4 different concentrations of acid and alkali are artificially prepared.The strength characteristics of the polluted soils are studied by means of direct shear tests and triaxial tests,and the influences of consistency phase of soils,pore-solid ratio and microstructure on the direct shear strength of the acid polluted soils are analyzed.Based on the relationship between the total stress strength index of acid polluted soils and its concentration,the relevant formula in is obtained,and it is practical in engineering.

关 键 词：污染土 抗剪强度 液性指数 微观结构 总应力强度 

分 类 号：TU441[建筑科学—岩土工程]