不同pH水环境下土变形特性的试验研究

Laboratory Test for Soil Deformation Properties in Solutions with Various pH Values

涉及水土化学作用的研究,以往更多关注水土作用的极限状态———污染土等方面的研究,而忽略处在常态,即常温、常压、缓变异的水化学环境中的城市区域土体稳定性研究,在这种环境中,影响土体稳定的要素———土体细观结构扮演着重要的角色,而其对地面沉降、土洞等宏观现象的产生都有重要影响。在常态水环境下,土结构的破裂面并不是通过颗粒本身,而是通过颗粒、颗粒集合体与集合体之间粒间连接结。从化学作用角度侧重分析水土作用中的化学作用,通过土细观结构这个桥梁进行水土化学相互作用分析,针对不同pH水环境下土的宏观变形过程进行试验,展示了土体宏观变形特性,证实了土的细观结构是水土化学作用发生与发展的“平台”和主要场所。

In the research aspect of water-soil chemical interaction, more emphasis was put on the polluted water, which is under the extreme state. Unfortunately, much less studies were conducted for the soilmass stability in urban regions, which is under the ordinary state at normal temperatures, pressures and chronic change of hydrological environment. Mini-scale structure of soil plays an important role in soilmass stability, and in formation of land subsidence and soil holes in natural condition. The fracture of soil structure takes place by invalidation of the joints fetween grains and aggregates. From the view point of water-soil chemical interaction and based on mini-scale structure of soil, the authors studied the macro-deformation properties in solutions with various pH values, conducted correlative laboratory test and proved the fact that mini-scale structure is the main locations where the water-soil chemical interaction takes place.