doi:10.16186/j.cnki.1673-9787.2023030026

Received:2023-03-10

Revised:2023-05-16

Online Date:2023-12-03

Experimental study on wind erosion and fugitive dust resistance performance of engineering bare soil in microbial consolidation（Online）

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:Based on the technology of Microbial Induced Calcite Precipitation （MICP） to solidify soil， the test of microbial solidification of typical construction bare soil construction waste and sand was carried out by using Sporosarcina pasteurii. The effect of wind erosion dust resistance of microbial solidified specimens and its solidification mechanism were studied， and a new soil dust suppression measure was proposed. The results of wind tunnel test and surface strength test showed that， under the same condition， the cumulative loss of wind erosion mass of microbial solidified specimens was much lower than that of watering specimens. The surface strength decreases after wind tunnel test， but the surface strength of microbial solidified specimens was much higher than that of watering specimens. The test showed that the microbial solidified construction bare soil had significant efficiency and feasibility to improve its resistance to wind erosion dust. Based on scanning electron microscopy and X-ray energy spectrum analysis showed， 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 flaky structure in construction waste and spherical or spherical accumulation structure in sand specimens. The test results showed that the microbial solidification technology effectively improved the soil anti-wind erosion dust performance and had certain reference value.

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

CLC：TU41