硫酸钠盐渍土渗透特性研究  

Study of permeability of sodium sulfate saline soil

作　　者：刘力 万旭升[1] 王智猛[2] 邱恩喜 龚富茂 钟昌茂 吴松波 LIU Li;WAN Xusheng;WANG Zhimeng;QIU Enxi;GONG Fumao;ZHONG Changmao;WU Songbo(School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China;China Railway Eryuan Engineering Group Co. LTD, Chengdu 610031, China)

机构地区：[1]西南石油大学土木工程与测绘学院,四川成都610500 [2]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《大连理工大学学报》2020年第6期628-634,共7页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(41601068);西南石油大学科研起航计划资助项目(2015QHZ025);西南地区红层泥岩道路工程特性及修建技术研究(KYY2019140(19-20)).

摘　　要：盐渍土内部水分渗流过程是影响区域生态环境演变、水资源利用以及工程施工、使用安全的重要因素.为预测饱和硫酸钠盐渍土渗透系数曲线,通过修正土水势模型推导了饱和盐渍土渗透系数计算模型,并通过渗透试验验证该计算模型的可靠性;此外,通过室内渗透试验研究了微纳米材料对盐渍土渗透性的影响.结果表明:渗透系数计算模型可较好反映饱和硫酸钠盐渍土渗透系数的变化规律,渗透系数随着含盐量的增加而减小,当含盐量大于2%后变化很小.硫酸钠盐渍土的渗透系数随着纳米二氧化硅的掺量增加而减小,随着纳米碳酸钙的掺量增加先减小后增大,随着相变材料的掺量增加先增大后减小并趋于稳定.The process of water seepage in saline soil is an important factor affecting the evolution of regional ecological environment,the utilization of water resources,and the safety of engineering construction and use.In order to predict the permeability coefficient curve of saturated sodium sulfate saline soil,the calculation model of the permeability coefficient of saturated saline soil is deduced by modifying the soil water potential model,and the reliability of the calculation model is verified by permeability test.In addition,the influence of micro nano materials on the permeability of saline soil is studied by indoor permeability test.The results show that the calculation model of permeability coefficient can better reflect the change rule of permeability coefficient of saturated sodium sulfate saline soil.The permeability coefficient decreases with the increase of salt content,and changes little when the salt content is more than 2%.The permeability coefficient of sodium sulfate saline soil decreases with the increase of nano silica content.However,as the content of nano calcium carbonate increases,the permeability coefficient of sodium sulfate saline soil decreases first and then increases.In addition,the permeability coefficient of sodium sulfate saline soil increases first and then decreases with the content of phase change materials and tends to stabilize.

关 键 词：硫酸钠盐渍土 渗透系数 土水势模型 预测模型 微纳米材料 

分 类 号：TU448[建筑科学—岩土工程]