干湿循环作用下EICP固化仿遗址土的耐久性

In order to study the stability of the site soil in the process of capillary water dry-wet cycles, the technology of soybean urease induced calcium carbonate precipitation (EICP) is employed to effectively inhibit the deterioration of the site soil. In this paper, the Ruanji Xiaotai site in Weishi County, Kaifeng, is taken as the research object, and the site soil is self-made, and the indoor dry-wet cycle simulation test is conducted. The changes of the appearance, quality and unconfined compressive strength of the imitation site soil samples under different cycles and different cement concentration are studied, and the mechanism of EICP technology curing the imitation site soil is analyzed from the microscopic level by combining scanning electron microscope (SEM). The results show that, with the increase of dry wet cycles, the mass loss of EICP strengthened specimens is reduced, the structural stability gets better, and less decrease of the unconfined compressive strength is observed.The SEM results showed that calcium carbonate crystals were formed in the samples strengthened by EICP, which contributes in the cementing and filling of soil particles, leading to the improvement of the strength of the solidified soil.