Solidification tests was conducted on cohesive soil with different binder ratios by using microbially induced carbonate precipitation(MICP)technique.Physical properties,mechanical strength,calcium carbonate content after mineralization reaction were tested on MICP solidified soil.The aim was to investigate the effect of different urea and calcium chloride volume ratios in the binder on the reinforcement effect of soil samples.The experimental results show that compared with the remolded soil samples with natural moisture content,the moisture content and porosity of each sample reinforced by MICP decrease,while the dry density and calcium carbonate content increase.The shear strength and compressive strength are also improved to varying degrees.When the ratio of urea to calcium chloride is 1∶1,the content of calcium carbonate formed by microbial mineralization is the highest.When the ratio of urea to calcium chloride is 2∶1,the strength of microbial mineralization samples is higher.Analysis suggests that the effect of microbial soil stabilization is not only related to the content of calcium carbonate after mineralization,but also closely related to the microstructure of mineralized crystals and their filling characteristics in soil pores.
关键词
粘性土/微生物诱导碳酸钙沉淀技术/胶结液配比/固化试验/力学强度
Key words
cohesive soil/microbially induced carbonate precipitation technique/ratio of cementation solution/stabilization test/strength of force
维普
万方数据