The　evolution　of　globalization　and　rapid　industrialization,　coupled　with　intensive　human　activities,　leads　to　a　significant　release　of　acidic　gases　and　particles　(e.g.,　NOX　and　SO2)　is　unavoidable.　These　emissions　eventually　result　in　dry　and　wet　acid　depositions　due　to　atmospheric　circulation.　This　infiltration　of　acidic　elements　alters　the　chemical　properties　of　water　systems,　thereby　deteriorating　ground　stability.　The　economically　developed　soft　clay　areas　face　considerable　threats　from　these　acid　environmental　attacks.　This　study　focused　on　employing　a　＇＇one-part＇＇　geopolymer　(OPG)　comprising　ground　granulated　blast　furnace　slag　(GGBFS),　fly　ash　(FA),　and　solid　sodium　hydroxide　(NH)　to　stabilize　the　soft　clay.　Simultaneously,　the　deterioration　behavior　of　OPG　stabilized　soft　clay　under　two　different　acids　(HNO3　and　H2SO4)　with　various　pH　values　(pH　of　2,　4,　and　6)　and　varied　immersion　periods　up　to　240　days　was　evaluated　including　the　mass　loss,　neutralization　depth　(ND),　pH　value,　and　unconfined　compressive　strength　(UCS).　Additionally,　scanning　electron　microscopy　(SEM)　and　X-ray　energy　spectrometry　(EDS)　characterized　the　evolution　of　microstructure　and　hydrate　composition　of　OPG-stabilized　soft　clay　post　varied　acid　immersion.　The　results　highlighted　the　superior　acid　resistance　of　the　stabilized　soft　clay　with　an　80:20　GGBFS/FA　ratio　compared　to　other　ratios.　The　presence　of　significant　hydration　products,　such　as　calcium　silicate　hydrates　(C–S–H),　calcium　aluminate　(aluminosilicate)　hydrates　(C-A-(S)–H),　and　sodium　aluminosilicate　hydrates　(N-A-S-H),　was　observed　in　the　OPG　stabilized　soft　clay.　In　addition,　the　contents　of　Si　in　the　OPG　played　a　significant　role　in　enhancing　the　acid　resistance　of　the　OPG　stabilized　soft　clay.　Based　on　these　experimental　results,　two　proposed　mechanisms　detailed　the　deterioration　and　acid　resistance　of　the　OPG　stabilized　soft　clay　under　HNO3　and　H2SO4　attack.　The　findings　of　this　study　contribute　to　advancing　scientific　comprehension　concerning　the　acid　resistance　of　the　OPG　stabilized　soft　clay　in　ground　improvement　practices.　©　2024　Elsevier　Ltd