摘要
地面沉降是天津市平原区的主要地质灾害,产生地面沉降原因之一为地下水开采层内黏性土压缩。为深入认识黏性土压缩变形特征,对不同深度黏土样品进行黏土物质组成、微观结构特征、孔径分布等方面的微观结构测试分析。大于10μm孔隙主要为碎屑颗粒刚性骨架孔隙结构,选取的8组原状样品中的5组孔隙率大于30%,现状黏性土仍处于快速压实阶段;孔隙分布表明,黏土压缩过程主要为大于1μm的孔隙变形,变形后由更细小颗粒填充。分析研究成果对地面沉降防治具有一定指导意义。
Land subsidence is the main geological hazard in the plain region of Tianjin, one of the reasons for the clay compression of land subsidence, releasing water compact non-elastic deformation of clay. Testing the microscopic structure of clay at different depths wil provide a deeper understanding of the compression characteristics of clay. This test main from clay material composition, and micro structure features, and aperture distribution, is greater than 10μm pore main for debris particles rigid skeleton pore structure, select of 8 group original samples in the of 5 group pore rate is greater than 30%, status clay stil is fast pressure real stage; for pore distribution, clay compression process main for is greater than 1 μm of pore deformation, deformation by more smal particles ifl ed. Analysis results on ground settlement control work has must of reference value.
出处
《上海国土资源》
2014年第4期40-43,共4页
Shanghai Land & Resources
基金
中国地质调查局地质调查项目"华北平原(天津)地面沉降监测与防治综合研究"(1212010814045)
关键词
黏土
压缩变形
微观结构
孔径分布
有效孔隙率
land subsidence
clay
compression deformation
microcosmic structure
pore size distribution
effective porosity
