Carbon dioxide (CO₂) geological sequestration is an effective way to control CO₂ emissions, and the geological safety in CO₂ injection project is the most concern problem. Enzyme-induced carbonate precipitation (EICP) technique is believed as useful to overcome CO₂ leakage problem, but its main cementation matter, calcium carbonate, may be corroded by acidic CO₂ solution. Therefore, laboratory studies are necessary to investigate the acid corrosion and resistance of EICP treated sandy soils. In this study, the EICP specimens were immersed in acid solutions with different concentrations, and both mechanical strength and micro-macro structure were investigated based on mass loss, apparent analysis, unconfined compressive strength tests, SEM and XCT. The results indicate that the corrosive effect of acid solution on EICP specimens was obviously strengthened by the decrease in solution pH, the ablation of calcium carbonate destroyed the cementation-pore structure resulting in the gradual shedding of the outer layer of the specimens and the nearly linear decrease in unconfined compressive strength. After acid corrosion reaction, the EICP specimens were found with a large number of intergranular pores among calcium carbonate particles. This study reveals the evolution mechanism of acid corrosion of EICP specimens, providing a reference for the corrosion resistance of EICP.

二氧化碳(CO ₂ )地质封存是控制CO _{2排放的有效途径，而CO 2}注入工程的地质安全是最受关注的问题。酶诱导碳酸盐沉淀(EICP)技术被认为可用于克服CO ₂泄漏问题，但其主要胶结物质碳酸钙可能会被酸性CO ₂溶液腐蚀。因此，有必要进行实验室研究来研究EICP处理的沙土的酸腐蚀和耐酸性。本研究将EICP试样浸入不同浓度的酸溶液中，通过质量损失、表观分析、无侧限抗压强度测试、SEM和XCT研究机械强度和微观宏观结构。结果表明，酸性溶液对EICP试件的腐蚀作用随着溶液pH值的降低而明显增强，碳酸钙的烧蚀破坏了胶结孔隙结构，导致试件外层逐渐脱落，试件呈现近线形。无侧限抗压强度降低。经过酸腐蚀反应后，EICP试样发现碳酸钙颗粒之间存在大量的粒间孔。该研究揭示了EICP试件酸腐蚀的演化机制，为EICP试件的耐腐蚀性能提供参考。