城市区域水土作用与土细观结构变异的试验研究

Experiment study to City area water-soil interaction and soil structural change

城市区域的水土作用因城市建设引发地下水"变异"而加剧,水土作用使土结构发生变化从而影响到土强度变化.文中将土的结构划分为微观、细观与宏观结构三层次,并定义了细观结构的物理涵义.通过细观结构变异试验以及SEM、X射线衍射、CT、STM等四种测试方法运用,表明在城市常温、常压、缓慢的地下水变异环境下,细观结构是水土相互作用发生、发展的"平台"及主要场所.研究所用方法与结果可用于预测因地下水环境变异引起的土体结构变异或引起土体污染后土体性质变化的趋势,进而为建筑环境的岩土环境稳定性做出评价和预测.

City area groundwater and soil activity is pricked up because of the city construction. It changes the soil structure and the soil intensity. In this paper the soil structure is divided into three levels: microcosmic, tiny and macroscopical, and also gives the physics meaning of the tiny structure. Through the tiny structure change test, SEM,X-radial, CT and STM, it shows that tiny structure is the main place of the activity in the common temperature and pressure. The study methods and conclusion can be used to preview the change of soil with the groundwater change, and then value the stability of geotechnical environment.