ZHANG M X, WANG Y T, LIU L,et al.Experimental study on wind erosion and fugitive dust resistance of engineering bare soil using microbial consolidation[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):169-176.

doi:10.16186/j.cnki.1673-9787.2023030026

Received:2023/03/10

Revised:2023/05/16

Published:2024/07/05

Experimental study on wind erosion and fugitive dust resistance of engineering bare soil using microbial consolidation

ZHANG Minxia1, WANG Yatao1, LIU Lu2, NIU Shuangjian3, KANG Junya1, FANG Yanfei1

1.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.College of Transportation Engineering，Nanjing Tech University，Nanjing  210000，Jiangsu，China;3.Shenzhen Municipal Engineering Corporation，Shenzhen  518000，Guangdong，China

Abstract: Objectives Geotechnical microbial technology has shown a wide range of application prospects in the field of civil engineering. Based on the Microbial Induced Calcium Carbonate Precipitation （MICP） soil solidification technology， this paper explores the resistance to wind erosion and dust effect and the solidification mechanism of the solidified soil. Methods Using Sporosarcina pasteurii， a comparative analysis of microbial solidified typical construction bare soil， construction waste， and sand specimens and their watered specimens were conducted. The resistance to wind erosion and dust of microbial solidified specimens was studied by wind tunnel test， surface strength test， and microstructure observation， and a new soil dust suppression measure was proposed. Results According to the results of the wind tunnel test and surface strength test， it was found that the cumulative loss of wind erosion mass of microbial solidified specimens was much lower than that of watered specimens under the same conditions. Although the surface strength of microbial solidified specimens decreased after the wind tunnel test， its surface strength was still stronger than that of watered specimens. The test results verified the feasibility and significant efficiency of microbial solidified construction bare soil to improve its resistance to wind erosion and dust. Based on scanning electron microscopy and X-ray energy spectrum test analysis， after the soil specimen was solidified by microorganisms， a large amount of CaCO₃ deposition was produced on the surface of the soil particles and between the pores， which effectively enhanced the bonding performance between the soil particles. The crystal structure of CaCO₃ was slightly different in different soils. It was mainly a flaky structure in construction waste and a spherical or aggregated structure in sand specimens. Conclusions Microbial solidification technology effectively enhances soil resistance to wind erosion and dust， with good durability， thereby offering valuable insights for soil dust control measures.

Key words:microbial solidification;construction bare soil;wind erosion and fugitive dust resistance; CaCO₃