EICP联合Na-Mt固化粉砂抗剪特性研究

When the traditional enzyme-induced carbonate precipitation (EICP) technology is used to solidify the silty sand, the generated calcium carbonate is scattered and not aggregated, resulting in poor solidification effect of the silty sand. Na-montmorillonite (Na-Mt) is combined with EICP technology to solidify the silty sand in the Yellow River flooding area. The change of shear resistance characteristics of solidified silty sand is studied through direct shear test, and the change of porosity of solidified silty sand is analyzed by scanning electron microscope(SEM) and Photoshop software to reveal the mechanism of EICP combined with Na-Mt to solidify silty sand. The results show that compared with the silty sand cured by traditional EICP technology, the shear strength and cohesion of the silty sand cured by EICP combined with Na-Mt can be increased by 41.4 % and 147.7 % respectively, and the porosity is reduced by 27.97 %. The key factor determining the shear strength of solidified silty sand is not porosity, but the establishment of \'Na-Mt-CaCO3-soil particle\' unit structure. Compared with the traditional EICP curing silt sand, EICP combined with Na-Mt curing silty sand can form large volume of calcium carbonate and enhance the skeleton effect of silty sand. EICP combined with Na-Mt is an efficient fine-grained soil solidification technology.