Soil Engineering and Foundation ›› 2019, Vol. 33 ›› Issue (6): 701-703.
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The pH value of a special subsurface soil in Zhanjiang is laboratory tested to be less than 3.5. In accordance with the current Code for Geotechnical Engineering Investigation, it is concluded that this soil is strongly corrosive to underground concrete structures. The further investigation indicates that the corrosion mechanism for this type of soil is microbial induced. When the permeability of soil layer is poor and the anaerobic sulfate reduces bacteria propagate, so that the sulfate in the pore water I the soil is reduced to sulfur or sulfide. When the permeability of the soil layer is improved, most sulfur and sulfide are not oxidized to sulfuric acid. After many years of experiment and research, it is concluded that this special subsurface soil in this area can be classified as weak corrosive soil to the underground concrete structures. In other words, if the selection of underground construction materials and the foundation construction procedures are appropriate, measures used for the weak corrosive soils can result in a significant construction cost saving.
