沸石增强砂土微生物固化效果研究

Study on the effect of zeolite-enhanced sand microbial solidification

为提高砂土的微生物固化效果,考虑沸石作为吸附材料具有多孔的特性,通过宏观物理力学试验和微细观检测,系统分析了沸石对微生物固化砂土的增强效果。研究结果表明:沸石能够显著提高砂土微生物加固过程中的固菌率。与常规微生物固化相比,掺入沸石后,固菌率提升约5.5倍,抗压强度提升39.35%,渗透系数减小71.94%。掺入沸石,一方面能够增加碳酸钙沉淀生成量,并改善其分布均匀性;另一方面,沸石周围的碳酸钙沉淀对两侧砂颗粒起到良好的桥接作用,能够增强砂颗粒之间的结构性及试样的整体性。研究成果为进一步优化微生物诱导碳酸钙沉积技术提供参考。

To enhance the microbial solidification of sand,zeolite was considered as an adsorbent material due to its porous properties.Involving macroscopic physical and mechanical tests as well as micro-fine observations to systematically analyze the strengthening effects of zeolite on microbial solidified sand.The results indicate that zeolite significantly improves the bacteria fixation rate during the microbial reinforcement process of sand.Compared to conventional microbial solidification,the inclusion of zeolite increased the bacteria fixation rate by approximately 5.5 times,enhanced the compressive strength by 39.35%,and reduced the permeability coefficient by 71.94%.The addition of zeolite not only increased the quantity of calcium carbonate precipitate but also improved its distribution uniformity.Furthermore,the calcium carbonate precipitates around the zeolite effectively bridged the adjacent sand particles,enhancing the structural integrity between the sand particles and the overall integrity of the samples.These findings provide a reference for further optimization of MICP(microbially induced calcite precipitation,MICP)technology.