Modification performance of soil in the Shang City archaeological site under high water content
Based on the carbonation effect of carbon dioxide,Shang City Ruins was selected as the research object.With the background of the"step by step"soil site modification method,sodium methyl silicate was added to modify the site soil,and the finite element model of the site was es-tablished to analyze the site safety performance and to explore the modification performance of the site.The results showed that sodium methyl silicate can effectively improve the shear strength and disintegration resistance of the soil.The modified soil with 3％sodium methyl sili-cate and carbonized for 2 h has the highest shear strength,whereas the modified soil with 3％so-dium methyl silicate and carbonized for 3 h has the best disintegration resistance.Using the"step by step"method,the penetration depth of the sodium methyl silicate waterproofing agent on the soil samples can reach 4 cm or more,and the specimen surface did not show cracks or collapse.Scanning electron microscopy revealed that the sodium methyl silicate carbonation reactant pol-ysiloxane film attached to the particle surface,changing the direction of the particle surface water tension,improving the disintegration resistance of the soil,and the product polysiloxane filled the pores of the soil particles,making the microstructure of the modified soil more compact.ABAQUS software calculation found that the safety factor of the high water content ruins site was 1.12,and the site safety factor increased to 1.9 after sodium methyl silicate modification.The research results provided a basis for the"step by step"large-scale soil site modification.
Shang City Ruinscarbonizationmechanical propertieshydrological properties
万方数据
维普
