粒径对微生物固化砂土抗风蚀扬尘能力的影响

Effect of Particle Size on the Ability of Anti-wind Erosion Dust of Microbial Solidified Sand

为探究颗粒粒径对微生物固化砂土抗风蚀能力的影响,选用4种不同粒径范围的土样,通过风洞试验以及表面强度、碳酸钙含量测定等试验,从宏观角度分析粒径对微生物固化砂土抗风蚀能力的影响;采用SEM扫描电镜观测,从微观角度对微生物固化砂土的作用机理进行研究。结果表明:颗粒粒径较小的土样,孔隙面积和孔喉直径较小,更易发挥碳酸钙晶体的填充和胶结作用,土体表面形成的固结层更加密实,抗风蚀能力更强且时效性更好。

In order to investigate the effect of particle size on the ability of anti-wind erosion of microbial solidified sand,four soil samples with varied particle sizes were selected.Wind tunnel tests and tests such as surface strength and calcium carbonate content determination were carried out to analyze the effect of particle size on the ability of anti-wind erosion of microbial solidified sand from a macroscopic point of view,while through SEM scanning electron microscopy for observation to investigate,the mechanism of action of microbial solidified sand was studied from a microscopic point of view.The result shows that soil samples with smaller particle sizes have smaller pore areas and pore throat diameters,making it easier for calcium carbonate crystals to fill and cement the soil,resulting in a denser consolidation layer on the soil’s surface that is more resistant to wind erosion and has better timeliness properties.