2024 Volume 10 Issue 56 Pages 2113-2117
Microbial induced calcite precipitation (MICP) is an environmentally friendly technique that involves the use of microorganisms to reinforce soil. The combination of MICP and fiber reinforced soil can better withstand seismic action. Especially, carbon fiber (CF) has a higher strength and modulus. In this study, 0.3% (relative to the sand weight) of CF was added to the calcareous sand, and the calcareous sand was reinforced with MICP-CF combined treatment. The liquefaction resistance of MICP-CF solidified calcareous sand was studied by cyclic triaxial (CTX) test and SEM scanning. The results showed that MICP treatment could improve the liquefaction resistance of calcareous sand. After adding CF, the accumulated cycles of axial strain εa were longer and developed slowly in the direction of extension until failure. The initial liquefaction did not occur when the εa reached 5%, and the pore water pressure directly entered the stabilization stage. SEM scanning showed that the great mechanical system of CF, calcite, and sand particles was strengthened after MICP solidified, which effectively enhanced the connection effect between sand particles and the cyclic resistance of calcareous sand.
