The Groundwater of Nansha

Guangzhou is highly rich in ammonium that is very rare in the world

and the highest concentration of ammonium is up to 390 mg/L. This region is in a central position of Guangdong-Hong Kong-marco Greater Bay Area

where a large number of projects have been built or are about to be built. The influence of ammonium has not been specially concerned

taking Nansha Section of Guangzhou Metro line 18 as an example

the effect of ammonium on the engineering properties of soil has been researched. Unlike previous methods that remolded soil is applied as experimental material

after processed by pickling with pH=1 hydrochloric acid

washing with deionized water and permeation with ammonium solution

undisturbed soft soil of Nansha was used to do consolidation and direct shear test in this research. The result shows that an increased ammonium concentration leads to compressibility enhancement and higher shear strength of soil.