Microbially induced calcium carbonate precipitation technology(MICP)combined with fiber reinforcement or additive has become a new way of rock and soil improvement,and has broad application prospects in scenarios such as land desertification control.This paper takes the eolian sand taken from the Mu Us Desert as the research object,and in-troduces ginger stone and calcium oxide on the basis of MICP combined with fiber reinforcement,so that the two inorganic compounds have an impact on the microbial process and reinforcement effect.The mechanical properties,failure modes and mechanism of the samples after curing with the participation of additive were systematically analyzed from a micro-scopic perspective.The test results show that the strength of the MICP combined fiber reinforcement solidified specimen shows an increasing trend with the increase of the amount of ginger stone incorporated,and reaches the peak when the content is 4％,which is 37.3％higher than that of the non-incorporated ginger stone specimen.The strength of the solidi-fied specimens with MICP combined fiber reinforcement showed a trend of first decreasing and then increasing with the addition of calcium oxide,and the strength decreased by 76.4％when the content reached 1％.Calcium oxide has a sig-nificant inhibitory effect on bacteria,when the calcium oxide content reaches 0.8％,most of the bacteria have lost their activity,and the OD600 value is the lowest,which is 0.107.The mechanism of action of ginger stone on the solidification effect of MICP combined fiber reinforcement is mainly manifested in the fact that ginger stone can effectively eolian sand particles and fill pores,so as to improve the overall stability of the specimen.The research results can provide reference for the practice of eolian sand solidification and practical engineering application.
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