Xu Kai,Jin Guixiao,Liu Zijian,et al.2020.Model test of multi-layer porous microbial grouting in soft rock fillings[J].Journal of Engineering Geology, 28(4):697-706.doi: 10.13544/j.cnki.jeg.2019-456.
    Citation: Xu Kai,Jin Guixiao,Liu Zijian,et al.2020.Model test of multi-layer porous microbial grouting in soft rock fillings[J].Journal of Engineering Geology, 28(4):697-706.doi: 10.13544/j.cnki.jeg.2019-456.

    MODEL TEST OF MULTI-LAYER POROUS MICROBIAL GROUTING IN SOFT ROCK FILLINGS

    • There are few studies about using non-destructive testing technology to evaluate the reinforcement effect of microbial cementation presently. This paper is based on the determination of best microbial grouting period and grouting rate, and uses a self-design multi-layer porous microbial grouting pipeline system to carry out indoor model test of microbial grouting in shale residual soil. Effectiveness of reinforcement is evaluated with ultrasonic testing technology. The results show that: (1)The ultrasonic velocity of residual soil fillings increases obviously after microbial grouting with multi-layer porous grouting pipeline system, which proves that multi-layer porous grouting pipeline system performs well during the grouting. (2)The wave velocities and wave velocities increments of the cements are symmetrical. The reinforcement effect of the soil in the middle of the fillings is remarkable, which provides preliminary law about the process of microbial grouting with multi-layer porous grouting pipeline system in shale residual. (3)The strategy that "the side wave velocity value determines the total value while the front wave velocity value determines the proportion of each measuring point" is taken to calculate the velocity of each measuring point, which further reveals the process of reinforcement insides the fillings through cloud chart of wave velocity value of fillings. The research conclusions can provide reference and basis for the effect analysis of microbial reinforcement.
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