Abstract
Microbial-induced calcium carbonate precipitation (MICP) technology is a new green reinforcing technology in soil stabilization. Targeting on the problem that seepage is the main factor of causing the instability of a tailings dam, a comparative experiment is conducted, which includes the MICP technology on reinforcing tailings with or without the effect of a seepage field. The results of the comparative experiment are as follow: the mercury penetration test indicates that, under the function of a seepage field, the total pore in the tailing is relatively decreased; SEM shows that under the function of a seepage field, the intergranular pore increases; the direct shear test shows that under the function of a seepage field, the tailings’ shear strength decreases; the determination of calcium ion content shows that the distribution of calcium carbonate in the tailings under the action of a seepage field is more uneven.
Highlights
The tailings dam is an artificial pollution source with high potential energy
Since seepage is one of the main factors that could cause instability of the tailing dam body, while slip casting under the phreatic line has great significance in improving the safety and stability of the high tailings dam, the research compares the microbial grouting reinforcement experiment on the tailings sand with or without the effect of the seepage field
Bacillus pastoris was selected as the dominant strain for cultivation, and it was purchased from the strain collection center (ATCC, 11859)
Summary
The tailings dam is an artificial pollution source with high potential energy. Once the dam breaks, it will cause severe casualties, property damage, and environmental pollution [1]. Since seepage is one of the main factors that could cause instability of the tailing dam body, while slip casting under the phreatic line has great significance in improving the safety and stability of the high tailings dam, the research compares the microbial grouting reinforcement experiment on the tailings sand with or without the effect of the seepage field. Through various detection methods of scanning electron microscopy, mercury intrusion experiment, shear experiment, and detection of calcium content in different parts, the changes of internal pores, gemel volume between particles, and shear strength are compared, and the macroimpact and microimpact of the seepage field on microbial grouting reinforcement are obtained This has the significance of guiding the grouting reinforcement below the phreatic line of the tailings dam
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