Hong Kong-Zhuhai-Macao Bridge Gongbei tunnel is located in coastal areas. Its groundwater is connected to the seawater

foundation pit bottom of Gongbei tunnel is reinforced by dry jet mixing method and high pressure jet grouting method. Under the action of corrosive ions in seawater

strength and stability of cemented soil produced by reinforcement would get changed; thus impact on engineering safety. According to difference between the two kinds of construction technology，two kinds of cemented soil test blocks which contain or not contain corrosive substance were made

one-component chemical solutions of different concentrations were prepared to model water erosion environment

then the prepared cemented soil test samples were put into the corrosive solution to soak for scheduled short period (≤28 d). By unconfined compression test

SEM and ion chromatography test

change laws of microstructure and unconfined compression strength of cemented soil test samples with corrosion time and solution concentration after short period soaking in one-component erosion solution; change law of ion concentration in corrosion solution with corrosion time was obtained respectively. Based on chemical component of brine

two-component chemical solutions of different concentrations were prepared to model water erosion environment; then the prepared containing corrosive substances mucky cemented soil test samples were put into the corrosive solutions to soak for scheduled long period(≥90 d). By unconfined compression test

change laws of unconfined compression strength of cemented soil test samples with corrosion time and solution concentration after long period soaking in two-component erosion solutions were obtained. These offer reference frame for temporary and long-lasting cemented soil engineering design and safety maintenance.