荒漠极干旱区板块状盐渍土微结构变化对其强度特性的影响分析  

Effect of microstructural changes of plate-like saline soil on its strength in extremely arid desert area

作　　者：冯忠居[1] 成超[1,2] 王廷武 刘小飞[4] 

机构地区：[1]长安大学,陕西西安710064 [2]中交第一公路勘察设计研究院有限公司,陕西西安710075 [3]新疆自治区交通厅,新疆乌鲁木齐830000 [4]广东省公路勘察规划设计院有限公司,广东广州510507

出　　处：《岩土工程学报》2011年第7期1142-1145,共4页Chinese Journal of Geotechnical Engineering

基　　金：新疆维吾尔自治区交通科技攻关项目(200609251)

摘　　要：荒漠极干旱区板块状盐渍土异于常规散状盐渍土,为揭示板块状盐渍土微结构变化对强度特性的影响,试验研究板块状盐渍土的成分、微结构和无侧限抗压强度特性,分析板块状盐渍土微结构变化对强度的影响规律,结果表明:板块状盐渍土氯盐和硫酸盐含量大于8%,有的甚至超过了60%,且以氯盐为主;矿物成份主要含石灰石、石英、钠长石、斜绿石、伊利石和高岭石为主。由砂、NaCl、Na2SO4胶结而成的板块状结构致密,但由于易溶盐含量和胶结情况的不同,微结构变化导致其无侧限抗压强度有很大的差异;板块状盐渍土具有岩石的强度特征,其值根据结构特征而变化,范围为3.8～20.2 MPa。研究成果为正确认识板块状盐渍土成因及工程特性提供了新的研究思路,为进一步研究板块状盐渍土及其应用处治技术奠定基础。The plate-like saline soil in extremely arid desert area is different from that of conventional bulk.To find out the effects of the microstructural changes of the plate-like saline soil on its strength,the composition,microstructure and properties of unconfined compressive strength of the plate-like saline soil are studied,and the effects of microstructural changes of the plate-like saline soil on its strength are analyzed.The results show that the plate-like saline soil is mainly composed of chloride,and the content of chloride,and sulfate in the plate-like saline soil is more than 8%,some even exceeds 60%.The main mineral components are limestone,quartz,albite,ramps pyrochlore,illite and kaolinite.The plate-like structure cemented by sand,NaCl and Na2SO4 is in dense situation.Because of the difference of soluble salt content and cement,the differences of properties of unconfined compressive strength caused by microstructural changes are great.The plate-like saline soil has the characteristics of the rock in strength,and its value varies from 3.8 MPa to 20.2 MPa according to its structural characteristics.It can be defined as rock salt based on its salt component and mineral characteristics.The results provide a new basis for a better understanding of the formation of the plate-like saline soil and its engineering properties.This study also lays the foundation for the treatment technology of the plate-like saline soil in engineering.

关 键 词：岩土工程 板块状盐渍土 微观结构 无侧限抗压强度 

分 类 号：TU448[建筑科学—岩土工程]