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| Experimental study on the evolution of calcium carbonate precipitation during MICP process in rock joints |
| XIAO Weimin1，2，FU Yeshan1，2，ZHONG Jianmin3，LIN Xin1，2，LI Shuang1，2 |
(1. School of Civil Engineering，Sichuan Agricultural University，Dujiangyan，Sichuan 611830，China；2. Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction，Dujiangyan，
Sichuan 611830，China；3. Jiangxi Youse Construction (Group) Co.，Ltd.，Nanchang，Jiangxi 330038，China) |
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Abstract Microbially Induced Carbonate Precipitation(MICP) method has been widely applied for soil reinforcement，but few researches on its applications in rock mass reinforcement had been reported. In order to explore the reinforcement mechanism of MICP method for rock joints，3D printing technology was used to prepare three groups of transparent resin artificial rock joints that had the same morphological characteristics as Barton?s standard profiles. Unidirectional non-cyclic grouting method was adopted for MICP tests in rock joints，and digital photography technology was used to collect real-time CaCO3 deposition images in rock joints，and on the basis of which the evolution of CaCO3 deposition during MICP process in rock joints was analyzed. From experimental results，it showed that CaCO3 firstly deposited and aggregated at the outlet corners，thus a CaCO3 deposition zone forming，and then it extended along the width direction of rock joint at the outlet. Furthermore，the CaCO3 deposition zone continued to extend toward the inlet and middle position of the specimen along the length and width direction，respectively. Finally，fully-deposited and partially-deposited CaCO3 zone were formed and CaCO3 effective deposition ratio was proposed to quantitatively represent the CaCO3 deposition zones in rock joint specimen under different grouting times. On this basis，it was obtained that the evolution law between CaCO3 effective deposition ratio and grouting time showed a three-stage trend which included initial deposition period，stable deposition period and accelerated deposition period. And an exponential function was proved to fit the evolution law well.
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2023, Vol. 42 
