Experimental Study On Effects Of Polluted Water Environment On Permeability Of Cemented Soil

Cement soil, as a kind high permeability material of good impermeability，has a certainstrength and good frost resistance. It is highly respected in the project, therefore, seepage pitengineering, cut-off wall, Impermeable sealing curtain, slope or embankment reinforcement,reservoir liner, shallow lake liner and other projects have been widely used. As we all know,most of the cement soil project in direct contact with the groundwater aggressive media, willlead to cement soil material the gradual deterioration even failure, influence cement soilpermeability and strength. In corrosive ground water project, not only pay attention to the useof cement soil security, but also the impact of groundwater incorporation cement soil with thecement soil construction and production. Because groundwater contains a variety of corrosivesubstances, should consider the combined effect of a variety of corrosive media influence oncement soil. So consider a variety of corrosive media together work，which to providetechnical parameters of impermeability and durability design and application of cement soilseepage project has important engineering significance.This paper summarizes on the basis of the domestic and international research aboutcement soil corrosion. By laboratory simulation experiments, comparative analysis of clearwater environmental and polluted water environment cement dosage and ages on the influenceof the compressive strength of cement soil and angle of internal friction, cohesion,permeability coefficient. The main work:(1) Were produced by polluted water and clean water conservation of soil cementspecimens, cement were taken9%,12%,15%three kinds of content produced24groups, atotal of432specimens，they were conserved in the clean water and polluted water to differentcuring period (ie30,60,90,120days) waiting to use;(2) Different curing period of cement soil specimens unconfined compression test, sheartest, penetration testing, obtain the appropriate mechanical parameters and permeability;(3) Analysis the clean water environment and polluted water environment cement soilcompressive strength and cohesion, internal friction angle and coefficient of permeabilitywith cement content, age changes. Obtained regression curve of cement soil permeabilitycoefficient with age in the clean water environment and polluted water environment; (4) Applied chemistry titration analysis chemical composition of cement soil in the cleanwater environment and polluted water environment, get Ca2+, Mg2+, Cl-, SO42-ion contentwith four changes of age, while the analysis polluted water environment on cement soilcorrosion penetration and mechanism strength.