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Mechanical properties of soil reinforced by MICP and Eleusine indica: insights from grouting technique
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DOI：10.1007/s11440-026-03205-0.png)
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Abstract
En 中文
Microbially induced carbonate precipitation (MICP) is an emerging soil reinforcement technique, but its mechanical mechanism in synergy with vegetation for soil stabilization is still unclear. This study employed the grouting technique in combination with plant growth observation, mechanical property testing, quantitative component determination, and micro-morphological observation. These experiments were designed to investigate the effects of MICP on the adaptability of Eleusine indica and soil strength under three different cementation solution concentrations (0.25, 0.50, and 0.75 mol/L) and three different cycle numbers (2, 3, 4 cycles). The results showed that the soil reinforcement effect is optimal when the grouting flow rate is 4 mL/min and the drilling depth ratio is 0.64. MICP treatment inhibits both the germination and growth of Eleusine indica, but the two processes exhibit differential tolerance. The inhibitory effect increases with increasing cementation solution concentration and number of cycles, with the latter having a more significant impact. Using a treatment method with a cementation solution concentration of 0.50 mol/L and 2 cycle numbers can enhance soil strength (cohesion increases by 51.68% and internal friction angle increases by 13.79%) while ensuring the growth of Eleusine indica. Internal friction angle is mainly controlled by the CaCO3 production, while cohesion is influenced by both the CaCO3 production and roots. X-ray diffraction and scanning electron microscope analyses indicate that the formation and accumulation of calcium carbonate precipitate play a cementing and bridging effect on soil particles. This study demonstrates the tremendous potential of the synergistic technique of MICP and vegetation in slope protection.
Keywords:
Adaptability
Eleusine indica
Grouting technique
Mechanical properties
MICP
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